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Climate in Okayama (Honshu)


Average weather, temperature, rainfall, sunshine hours

Flag - Japan

Okayama, where it is located


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Climate chart - Okayama
The climate of Okayama, a Japanese city in the southern part of Honshu Island, in the region called Chugoku, is temperate, with quite mild winters and hot, moist, and rainy summers. Like the rest of Japan, the city is affected by the monsoon circulation: in winter, the northwest cold currents prevail, while in summer, they are replaced by hot and humid currents of tropical origin.
Okayama is located on the coast, in the Seto Inland Sea, an area relatively protected both from the winter monsoon (since we are on the south side) and from the summer monsoon as well as typhoons. In fact, on the other side of the sea, we find the island of Shikoku, which protects it from the south winds with its mountains.

In winter, there are fairly mild periods, with highs above 12 °C (54 °F), alternating with cold periods, with wind, rain, and highs around 5/7 °C (41/45 °F) or less. Night frosts are typically light, both because of the influence of the sea and because of the heat island effect. However, in January 1963, the temperature dropped to -8.9 °C (16 °F). Snowfall is very rare, even more so than in Tokyo.

Summers are hot and humid; there can be periods of good weather, with maximum temperatures around 35 °C (95 °F) or above and high humidity, but also periods of bad weather due to the summer monsoon. August is the hottest month, both because of the thermal inertia of the sea and because of the lower frequency of periods of bad weather.

Rainfall is quite abundant (although this is one of the driest areas of Japan), in fact it amounts to 1,100 millimeters (43 inches) per year. Winter is undoubtedly the driest season. The rainiest months are June and July, ie the first period of the rainy season (called Baiu). In August, there is a certain decrease in rain frequency: on average, among the summer months, it is the hottest as well as the driest and sunniest.

The main tourist attraction of Okayama, together with the castle, is the Koraku-en, the Japanese garden, considered as one of the three most important, together with the Kenroku-en in Kanazawa and the Kairaku-en in Mito.

Image of Korakuen Garden

The amount of sunshine in Okayama, quite good in winter, never becomes very good, but in summer, it is higher than in other parts of Japan. The sunniest months are April, May and August, with around 6 hours and a half of sunshine per day, and there are more than 2,000 hours of sunshine per year. This area is known to the Japanese as "The Sunny Country", but above all because the rains are relatively scarcer.

The sea in Okayama is warm enough for swimming, with a temperature of 23 °C (73 °F) or more, from July to October, and it becomes pleasantly warm in August.

From June to October (but especially from August to early October), Okayama may be affected by typhoons, the tropical cyclones of Southeast Asia, though, as mentioned, this area of the Seto Inland Sea is relatively sheltered.

Best Time



As regards to the climate, the best times to visit Okayama are spring and autumn, and in particular, from mid-April to mid-May and from late October to mid-November.
The cherry blossoming in Okayama reaches its peak around April the 3rd. About a week passes between the beginning and the peak of the flowering. The blooming date can vary by a few days, or even a week, earlier or later, depending on the year. Even though in some years it can get a little cold, with highs around 12 °C (54 °F), you can also take advantage of this period.
In summer, August is partly preferable to July, having more sunshine and less rainfall, but it is also true that it is hotter and there's a greater risk of typhoons.

The following meteorological data were recorded at the city station. The temperatures of the airport, located north of the city, in a green area, and at 240 meters (800 feet) of altitude, are a bit lower.

Okayama - Climate data


In Okayama, the average temperature of the coldest month (January) is of 5.2 °C, that of the warmest month (August) is of 29 °C. Here are the average temperatures.
Okayama - Average temperatures (1991-2020)
Temperatures (°C)
MonthMinMaxMean
January1.29.35.2
February1.610.36
March4.413.99.2
April9.519.814.6
May14.724.919.8
June19.527.823.6
July23.931.727.8
August24.93329
September20.828.724.8
October14.42318.7
November8.317.112.7
December3.311.67.4
Year12.32116.6

Precipitation amounts to 1145 millimeters per year: it is therefore quite abundant. It ranges from 35 millimeters in the driest month (January) to 175 millimeters in the wettest one (July). Here is the average precipitation.
Okayama - Average precipitation
MonthRain (mm)Days
January355
February457
March859
April9010
May1159
June17012
July17511
August958
September14010
October958
November556
December406
Year1145101

The sea temperature ranges from 15 °C in February, March to 27.5 °C in August. Here are the average sea temperatures.
Okayama - Sea temperature
MonthTemperatures (°C)
January16
February15
March15
April16
May18.5
June22
July25
August27.5
September26
October23.5
November21">
December18.5
Year20.4

There are on average around 2035 sunshine hours per year. Here are the average hours of sunshine per day.
Okayama - Sunshine hours
MonthAverageTotal
January5150
February5145
March5.5180
April6.5195
May6.5205
June5155
July5.5170
August6.5205
September5160
October5.5170
November5155
December5155
Year5.62035

Okayama - Weather by month

Based on the period 1991-2020
(January - February - March - April - May - June - July - August - September - October - November - December)


January, the coldest month of the year, is generally a quite cold month. The average temperature is of 5.2 °C, with a minimum of 1.2 °C and a maximum of 9.3 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around -2.5 °C. However, it dropped to -5.5 °C in January 2018.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 14 °C. However, it reached 16.9 °C in January 2016.
Rain iconPrecipitation amounts to 35 mm, distributed over 5 days.
The day lasts on average 10 hours and 5 minutes.
Sun iconThere are on average 5 hours of sunshine per day. So, the sun shines 48% of the time.
The average humidity is 69%.
The average wind speed is of 10 kph.
Sea iconThe average sea temperature is of 16.2 °C. Therefore, the sea is cold for swimming.


February is generally a quite cold month. The average temperature is of 6 °C, with a minimum of 1.6 °C and a maximum of 10.3 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around -2.5 °C. However, it dropped to -6.1 °C in February 2018.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 16.5 °C. However, it reached 22.1 °C in February 2010.
Rain iconPrecipitation amounts to 45 mm, distributed over 7 days.
The day lasts on average 11 hours and 0 minutes.
Sun iconThere are on average 5 hours of sunshine per day. So, the sun shines 47% of the time.
The average humidity is 66%.
The average wind speed is of 9 kph.
Sea iconThe average sea temperature is of 15 °C. Therefore, the sea is cold for swimming.


March is generally a mild month. The average temperature is of 9.2 °C, with a minimum of 4.4 °C and a maximum of 13.9 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around -0.5 °C. However, it dropped to -3.2 °C in March 2015.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 21 °C. However, it reached 24.8 °C in March 2018.
Rain iconPrecipitation amounts to 85 mm, distributed over 9 days.
The day lasts on average 12 hours and 0 minutes.
Sun iconThere are on average 5.5 hours of sunshine per day. So, the sun shines 48% of the time.
The average humidity is 65%.
The average wind speed is of 8 kph.
Sea iconThe average sea temperature is of 14.9 °C. Therefore, the sea is cold for swimming.


April is generally a very mild month. The average temperature is of 14.6 °C, with a minimum of 9.5 °C and a maximum of 19.8 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 2.5 °C. However, it dropped to 0.3 °C in April 1996.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 26.5 °C. However, it reached 29.6 °C in April 2004.
Rain iconPrecipitation amounts to 90 mm, distributed over 10 days.
The day lasts on average 13 hours and 5 minutes.
Sun iconThere are on average 6.5 hours of sunshine per day. So, the sun shines 49% of the time.
The average humidity is 60%.
The average wind speed is of 8 kph.
Sea iconThe average sea temperature is of 16.1 °C. Therefore, the sea is cold for swimming.


May is generally a warm month. The average temperature is of 19.8 °C, with a minimum of 14.7 °C and a maximum of 24.9 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 9 °C. However, it dropped to 5.7 °C in May 1991.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 30.5 °C. However, it reached 33.6 °C in May 2015.
Rain iconPrecipitation amounts to 115 mm, distributed over 9 days.
The day lasts on average 14 hours and 0 minutes.
Sun iconThere are on average 6.5 hours of sunshine per day. So, the sun shines 47% of the time.
The average humidity is 64%.
The average wind speed is of 8 kph.
Sea iconThe average sea temperature is of 18.6 °C. Therefore, the sea is very cool for swimming.


June is generally a warm to hot, muggy month. The average temperature is of 23.6 °C, with a minimum of 19.5 °C and a maximum of 27.8 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 15 °C. However, it dropped to 11.9 °C in June 2016.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 33.5 °C. However, it reached 37 °C in June 2013.
Rain iconPrecipitation amounts to 170 mm, distributed over 12 days.
The day lasts on average 14 hours and 25 minutes. So the days are long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
Sun iconThere are on average 5 hours of sunshine per day. So, the sun shines 35% of the time.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is of 7 kph.
Sea iconThe average sea temperature is of 21.8 °C. Therefore, the sea is cool for swimming.


July is generally a very hot, muggy month. The average temperature is of 27.8 °C, with a minimum of 23.9 °C and a maximum of 31.7 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 20.5 °C. However, it dropped to 17.3 °C in July 1992.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 36 °C. However, it reached 38.1 °C in July 2018.
Rain iconPrecipitation amounts to 175 mm, distributed over 11 days.
The day lasts on average 14 hours and 10 minutes. So the days are long.
Sun iconThere are on average 5.5 hours of sunshine per day. So, the sun shines 39% of the time.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is of 7 kph.
Sea iconThe average sea temperature is of 25.1 °C. Therefore, the sea is warm enough for swimming.


August, the hottest month of the year, is generally a very hot month. The average temperature is of 29 °C, with a minimum of 24.9 °C and a maximum of 33 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 21 °C. However, it dropped to 17.3 °C in August 2018.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 36.5 °C. However, it reached 39.3 °C in August 1994.
Rain iconPrecipitation amounts to 95 mm, distributed over 8 days.
The day lasts on average 13 hours and 25 minutes.
Sun iconThere are on average 6.5 hours of sunshine per day. So, the sun shines 49% of the time.
The average humidity is 69%.
The average wind speed is of 8 kph.
Sea iconThe average sea temperature is of 27.3 °C. Therefore, the sea is pleasantly warm and allows long swims.


September is generally a warm to hot, muggy month. The average temperature is of 24.8 °C, with a minimum of 20.8 °C and a maximum of 28.7 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 15 °C. However, it dropped to 11.5 °C in September 1992.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 33.5 °C. However, it reached 37.1 °C in September 2020.
Rain iconPrecipitation amounts to 140 mm, distributed over 10 days.
The day lasts on average 12 hours and 25 minutes.
Sun iconThere are on average 5 hours of sunshine per day. So, the sun shines 42% of the time.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is of 7 kph.
Sea iconThe average sea temperature is of 26 °C. Therefore, the sea is warm enough for swimming.


October is generally a warm month. The average temperature is of 18.7 °C, with a minimum of 14.4 °C and a maximum of 23 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 8 °C. However, it dropped to 2.5 °C in October 2020.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 28.5 °C. However, it reached 33.4 °C in October 2018.
Rain iconPrecipitation amounts to 95 mm, distributed over 8 days.
The day lasts on average 11 hours and 20 minutes.
Sun iconThere are on average 5.5 hours of sunshine per day. So, the sun shines 49% of the time.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is of 7 kph.
Sea iconThe average sea temperature is of 23.4 °C. Therefore, the sea can be considered barely acceptable for swimming.


November is generally a mild month. The average temperature is of 12.7 °C, with a minimum of 8.3 °C and a maximum of 17.1 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 2.5 °C. However, it dropped to 0.3 °C in November 2013.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 22.5 °C. However, it reached 24.6 °C in November 2020.
Rain iconPrecipitation amounts to 55 mm, distributed over 6 days.
The day lasts on average 10 hours and 20 minutes.
Sun iconThere are on average 5 hours of sunshine per day. So, the sun shines 50% of the time.
The average humidity is 72%. Hence, the air is normally humid.
The average wind speed is of 8 kph.
Sea iconThe average sea temperature is of 21 °C. Therefore, the sea is cool for swimming.


December is generally a quite mild month. The average temperature is of 7.4 °C, with a minimum of 3.3 °C and a maximum of 11.6 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around -1 °C. However, it dropped to -2.7 °C in December 2013.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 16.5 °C. However, it reached 20.6 °C in December 2018.
Rain iconPrecipitation amounts to 40 mm, distributed over 6 days.
The day lasts on average 9 hours and 55 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
Sun iconThere are on average 5 hours of sunshine per day. So, the sun shines 50% of the time.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is of 9 kph.
Sea iconThe average sea temperature is of 18.4 °C. Therefore, the sea is very cool for swimming.

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