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Climate in Hamamatsu (Honshu)


Average weather, temperature, rainfall, sunshine hours

Flag - Japan

Hamamatsu, where it is located


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Climate chart - Hamamatsu
In Hamamatsu, the climate is temperate, with quite mild, sunny winters and hot, humid 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.
Hamamatsu is located in the central part of the island of Honshu, on the coast, in the Chubu region and in the Shizuoka prefecture. North of the city lie the Kiso Mountains, or Central Alps, with a series of peaks almost 3,000 meters (9,800 ft) tall.

Given the relatively low latitude (on the 34th parallel) and the protection given by the mountains (we are on the southern side), in winter, the currents of Siberian origin are felt little, so there are many sunny days, and usually, it's not very cold. However, cold and windy periods, with highs around 6/8 °C (43/46 °F) or less, can not be ruled out. Snowfall is very rare: unlike in Tokyo, where it can sometimes snow, in practice it never snows (but sometimes, it can snow in the northern outskirts of the city, see Tenryu-ku). Night frosts are quite rare and usually light, however, at night, the temperature often drops near 0 °C (32 °F).

In summer, sunny and muggy periods alternate with periods of bad weather, with wind and rain. Fortunately, the breeze blows from the sea.

In Hamamatsu, precipitation is abundant, in fact, it amounts to 1,800 millimeters (70 inches) per year. Winter is definitely the driest season. The rainiest periods are the first part of the rainy season (mid-June to mid-July, the plum rains) and the latest (September, also because of the contribution given by typhoons, see below).

The amount of sunshine in Hamamatsu is good in winter, while it is barely decent in the other seasons, due to weather disturbances in spring and autumn, as well as to the summer monsoon. In summer, August is the sunniest month: apart from typhoons and some waves of bad weather, there are several sunny periods.

Image of Hamamatsu

The sea is warm enough for swimming, with a temperature of 23 °C (73 °F) or more, from July to October.

From June to October (but especially from August to early October), Hamamatsu can be affected by typhoons, the tropical cyclones of the Pacific, which in this area, facing south, are felt in a particular way. The most intense typhoons can bring torrential rains and heavy damage.

Best Time



As regards to the climate, the best times to visit Hamamatsu are spring and autumn, and in particular, from mid-April to mid-May and from late October to mid-November.
The cherry blossoming in Hamamatsu reaches its peak around the 30th of March. 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 10/12 °C (50/54 °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.

Hamamatsu - Climate data


In Hamamatsu, the average temperature of the coldest month (January) is of 6.1 °C, that of the warmest month (August) is of 27.6 °C. Here are the average temperatures.
Hamamatsu - Average temperatures (1991-2020)
Temperatures (°C)
MonthMinMaxMean
January2.3106.1
February2.8116.9
March5.914.410.1
April10.719.114.9
May15.12319
June19.425.722.5
July23.229.426.3
August24.230.927.6
September21.127.924.5
October15.62319.3
November1017.813.9
December4.612.48.5
Year1320.416.65

Precipitation amounts to 1845 millimeters per year: it is therefore abundant. It ranges from 60 millimeters in the driest month (January) to 245 millimeters in the wettest one (September). Here is the average precipitation.
Hamamatsu - Average precipitation
MonthRain (mm)Days
January606
February756
March14510
April18010
May19011
June22513
July21012
August1258
September24512
October20511
November1158
December656
Year1845113

The sea temperature ranges from 17 °C in February to 27.5 °C in August. Here are the average sea temperatures.
Hamamatsu - Sea temperature
MonthTemperatures (°C)
January18
February17
March17.5
April18.5
May20.5
June23
July26
August27.5
September26.5
October24
November22">
December19.5
Year21.8

There are on average around 2240 sunshine hours per year. Here are the average hours of sunshine per day.
Hamamatsu - Sunshine hours
MonthAverageTotal
January6.5205
February6.5190
March6.5200
April6.5200
May6.5205
June5150
July5.5175
August7210
September5.5165
October5165
November5.5170
December6.5200
Year6.12240

Hamamatsu - 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 6.1 °C, with a minimum of 2.3 °C and a maximum of 10 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around -2 °C. However, it dropped to -5 °C in January 1997.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 15 °C. However, it reached 18 °C in January 1996.
Rain iconPrecipitation amounts to 60 mm, distributed over 6 days.
The day lasts on average 10 hours and 5 minutes.
Sun iconThere are on average 6.5 hours of sunshine per day. So, the sun shines 66% of the time.
The average humidity is 56%.
The average wind speed is of 15.9 kph.
Sea iconThe average sea temperature is of 17.8 °C. Therefore, the sea is cold for swimming.


February is generally a quite mild month. The average temperature is of 6.9 °C, with a minimum of 2.8 °C and a maximum of 11 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around -2 °C. However, it dropped to -5 °C in February 1999.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 18 °C. However, it reached 22 °C in February 2006.
Rain iconPrecipitation amounts to 75 mm, distributed over 6 days.
The day lasts on average 11 hours and 0 minutes.
Sun iconThere are on average 6.5 hours of sunshine per day. So, the sun shines 61% of the time.
The average humidity is 55%.
The average wind speed is of 16 kph.
Sea iconThe average sea temperature is of 17 °C. Therefore, the sea is cold for swimming.


March is generally a mild month. The average temperature is of 10.1 °C, with a minimum of 5.9 °C and a maximum of 14.4 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 0 °C. However, it dropped to -2 °C in March 2001.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 20.5 °C. However, it reached 25 °C in March 2018.
Rain iconPrecipitation amounts to 145 mm, distributed over 10 days.
The day lasts on average 12 hours and 0 minutes.
Sun iconThere are on average 6.5 hours of sunshine per day. So, the sun shines 54% of the time.
The average humidity is 58%.
The average wind speed is of 15.2 kph.
Sea iconThe average sea temperature is of 17.3 °C. Therefore, the sea is cold for swimming.


April is generally a very mild month. The average temperature is of 14.9 °C, with a minimum of 10.7 °C and a maximum of 19.1 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 4 °C. However, it dropped to 0 °C in April 1999.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 24.5 °C. However, it reached 29 °C in April 2005.
Rain iconPrecipitation amounts to 180 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 51% of the time.
The average humidity is 63%.
The average wind speed is of 14.4 kph.
Sea iconThe average sea temperature is of 18.5 °C. Therefore, the sea is very cool for swimming.


May is generally a warm month. The average temperature is of 19 °C, with a minimum of 15.1 °C and a maximum of 23 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 10 °C. However, it dropped to 7.8 °C in May 1991.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 28 °C. However, it reached 31 °C in May 2015.
Rain iconPrecipitation amounts to 190 mm, distributed over 11 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 70%. Hence, the air is normally humid.
The average wind speed is of 12.7 kph.
Sea iconThe average sea temperature is of 20.7 °C. Therefore, the sea is cool for swimming.


June is generally a warm month. The average temperature is of 22.5 °C, with a minimum of 19.4 °C and a maximum of 25.7 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 15.5 °C. However, it dropped to 13 °C in June 2010.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 31.5 °C. However, it reached 36 °C in June 2011.
Rain iconPrecipitation amounts to 225 mm, distributed over 13 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 34% of the time.
The average humidity is 79%. Hence, the air is normally humid.
The average wind speed is of 11.6 kph.
Sea iconThe average sea temperature is of 23.2 °C. Therefore, the sea can be considered barely acceptable for swimming.


July is generally a warm to hot, muggy month. The average temperature is of 26.3 °C, with a minimum of 23.2 °C and a maximum of 29.4 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 19 °C. However, it dropped to 16.8 °C in July 1992.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 34.5 °C. However, it reached 37 °C in July 2001.
Rain iconPrecipitation amounts to 210 mm, distributed over 12 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 40% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is of 11.5 kph.
Sea iconThe average sea temperature is of 26 °C. Therefore, the sea is warm enough for swimming.


August, the hottest month of the year, is generally a very hot, muggy month. The average temperature is of 27.6 °C, with a minimum of 24.2 °C and a maximum of 30.9 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 21 °C. However, it dropped to 18.5 °C in August 1996.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 35.5 °C. However, it reached 39 °C in August 2020.
Rain iconPrecipitation amounts to 125 mm, distributed over 8 days.
The day lasts on average 13 hours and 25 minutes.
Sun iconThere are on average 7 hours of sunshine per day. So, the sun shines 51% of the time.
The average humidity is 77%. Hence, the air is normally humid.
The average wind speed is of 11.7 kph.
Sea iconThe average sea temperature is of 27.7 °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 24.5 °C, with a minimum of 21.1 °C and a maximum of 27.9 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 16 °C. However, it dropped to 13 °C in September 1997.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 33 °C. However, it reached 36 °C in September 1992.
Rain iconPrecipitation amounts to 245 mm, distributed over 12 days.
The day lasts on average 12 hours and 25 minutes.
Sun iconThere are on average 5.5 hours of sunshine per day. So, the sun shines 45% of the time.
The average humidity is 76%. Hence, the air is normally humid.
The average wind speed is of 11.2 kph.
Sea iconThe average sea temperature is of 26.6 °C. Therefore, the sea is pleasantly warm and allows long swims.


October is generally a warm month. The average temperature is of 19.3 °C, with a minimum of 15.6 °C and a maximum of 23 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 10 °C. However, it dropped to 6 °C in October 1997.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 28 °C. However, it reached 31 °C in October 2013.
Rain iconPrecipitation amounts to 205 mm, distributed over 11 days.
The day lasts on average 11 hours and 20 minutes.
Sun iconThere are on average 5 hours of sunshine per day. So, the sun shines 46% of the time.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is of 10.9 kph.
Sea iconThe average sea temperature is of 24.2 °C. Therefore, the sea is warm enough for swimming.


November is generally a mild month. The average temperature is of 13.9 °C, with a minimum of 10 °C and a maximum of 17.8 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 4 °C. However, it dropped to 2 °C in November 1995.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 23 °C. However, it reached 26 °C in November 2000.
Rain iconPrecipitation amounts to 115 mm, distributed over 8 days.
The day lasts on average 10 hours and 20 minutes.
Sun iconThere are on average 5.5 hours of sunshine per day. So, the sun shines 55% of the time.
The average humidity is 65%.
The average wind speed is of 12.1 kph.
Sea iconThe average sea temperature is of 22 °C. Therefore, the sea is cool for swimming.


December is generally a quite mild month. The average temperature is of 8.5 °C, with a minimum of 4.6 °C and a maximum of 12.4 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around -0.5 °C. However, it dropped to -3 °C in December 2012.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 18 °C. However, it reached 23 °C in December 2015.
Rain iconPrecipitation amounts to 65 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 6.5 hours of sunshine per day. So, the sun shines 65% of the time.
The average humidity is 60%.
The average wind speed is of 14.7 kph.
Sea iconThe average sea temperature is of 19.7 °C. Therefore, the sea is very cool for swimming.

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