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Climate in Eureka (California)


Average weather, temperature, rainfall, sunshine hours

Flag - United States

Eureka, where it's located


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Climate chart - Eureka
The climate of Eureka is oceanic, with mild, rainy winters and cool, sunny summers.
The city is located in the extreme northwest of California, on Humboldt Bay, and a short distance from the border with Oregon.
The latitude is not very low (we are at the 40th parallel), so weather fronts from the ocean arrive in the cold half of the year.
In winter, the rains are abundant. The temperature can drop a few degrees below freezing on the coldest nights. Snow is very rare.
The relatively sunniest season is spring, because in summer, even if it is the driest season, morning fogs can form.
Summer is particularly cool because of the cold current flowing in the ocean. Besides, as mentioned, the summer is sunny, although there may be morning fogs. From May to October, the temperature can reach 28/30 °C (82/86 °F), generally for a day or two, when the wind blows from the desert, but given the distance, this happens very rarely.
North of the city is the Redwood National Park, where the tallest tree in the world, called Hyperion (whose exact location is secret though) is located.

Eureka

Best Time


The best time to visit Eureka is from June to September, as it is the mildest and driest of the year.

Eureka - Climate data


In Eureka, the average temperature of the coldest month (December) is of 8.9 °C, that of the warmest month (August) is of 14.4 °C. Here are the average temperatures.
Eureka - Average temperatures (1991-2020)
Temperatures (°C)
MonthMinMaxMean
January4.713.69.1
February4.813.79.2
March5.213.79.5
April614.310.1
May7.815.411.6
June9.216.913.1
July10.717.414.1
August10.718.114.4
September9.218.413.8
October7.217.512.4
November5.614.910.3
December4.313.48.9
Year7.115.611.35

Precipitation amounts to 1170 millimeters per year: it is therefore quite abundant. It ranges from 5 millimeters in the driest months (July, August) to 225 millimeters in the wettest one (December). Here is the average precipitation.
Eureka - Average precipitation
MonthRain (mm)Days
January19018
February16518
March16018
April10514
May5511
June256
July55
August56
September209
October7012
November14517
December22519
Year1170153

The sea temperature ranges from 11 °C in February, March, April to 14 °C in September. Here are the average sea temperatures.
Eureka - Sea temperature
MonthTemperatures (°C)
January11.5
February11
March11
April11
May11.5
June12.5
July13
August13.5
September14
October13.5
November13">
December12
Year12.3

There are on average around 2465 sunshine hours per year. Here are the average hours of sunshine per day.
Eureka - Sunshine hours
MonthAverageTotal
January4.5140
February5145
March6.5205
April8.5255
May9280
June9.5280
July9275
August7.5235
September7.5220
October5.5175
November4.5130
December4125
Year6.82465

Eureka - Weather by month

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


January is generally a mild month. The average temperature is of 9.1 °C, with a minimum of 4.7 °C and a maximum of 13.6 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around -1 °C. However, it dropped to -5 °C in January 2007.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 20 °C. However, it reached 24 °C in January 2003.
Rain iconPrecipitation amounts to 190 mm, distributed over 18 days.
The day lasts on average 9 hours and 35 minutes.
Sun iconThere are on average 4.5 hours of sunshine per day. So, the sun shines 47% of the time.
The average humidity is 83%. Hence, the air is normally humid.
The average wind speed is of 9.9 kph.
Sea iconThe average sea temperature is of 11.4 °C. Therefore, the sea is very cold for swimming.


February is generally a mild month. The average temperature is of 9.2 °C, with a minimum of 4.8 °C and a maximum of 13.7 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around -1 °C. However, it dropped to -3.9 °C in February 2011.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 20.5 °C. However, it reached 26.7 °C in February 2016.
Rain iconPrecipitation amounts to 165 mm, distributed over 18 days.
The day lasts on average 10 hours and 40 minutes.
Sun iconThere are on average 5 hours of sunshine per day. So, the sun shines 48% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is of 10.4 kph.
Sea iconThe average sea temperature is of 11.2 °C. Therefore, the sea is very cold for swimming.


March is generally a mild month. The average temperature is of 9.5 °C, with a minimum of 5.2 °C and a maximum of 13.7 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 0 °C. However, it dropped to -2.2 °C in March 2008.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 19.5 °C. However, it reached 23 °C in March 2000.
Rain iconPrecipitation amounts to 160 mm, distributed over 18 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 56% of the time.
The average humidity is 83%. Hence, the air is normally humid.
The average wind speed is of 11.1 kph.
Sea iconThe average sea temperature is of 11.2 °C. Therefore, the sea is very cold for swimming.


April is generally a mild month. The average temperature is of 10.1 °C, with a minimum of 6 °C and a maximum of 14.3 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 0.5 °C. However, it dropped to -2 °C in April 2009.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 21 °C. However, it reached 28.3 °C in April 2014.
Rain iconPrecipitation amounts to 105 mm, distributed over 14 days.
The day lasts on average 13 hours and 25 minutes.
Sun iconThere are on average 8.5 hours of sunshine per day. So, the sun shines 63% of the time.
The average humidity is 83%. Hence, the air is normally humid.
The average wind speed is of 11.1 kph.
Sea iconThe average sea temperature is of 11.2 °C. Therefore, the sea is very cold for swimming.


May is generally a mild month. The average temperature is of 11.6 °C, with a minimum of 7.8 °C and a maximum of 15.4 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 3 °C. However, it dropped to 0 °C in May 2002.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 22 °C. However, it reached 34.4 °C in May 2008.
Rain iconPrecipitation amounts to 55 mm, distributed over 11 days.
The day lasts on average 14 hours and 30 minutes. So the days are long.
Sun iconThere are on average 9 hours of sunshine per day. So, the sun shines 62% of the time.
The average humidity is 85%. Hence, the air is normally humid.
The average wind speed is of 11.1 kph.
Sea iconThe average sea temperature is of 11.7 °C. Therefore, the sea is very cold for swimming.


June is generally a mild month. The average temperature is of 13.1 °C, with a minimum of 9.2 °C and a maximum of 16.9 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 4.5 °C. However, it dropped to 1.7 °C in June 1991.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 22.5 °C. However, it reached 28.9 °C in June 2019.
Rain iconPrecipitation amounts to 25 mm, distributed over 6 days.
The day lasts on average 15 hours and 5 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 9.5 hours of sunshine per day. So, the sun shines 61% of the time.
The average humidity is 85%. Hence, the air is normally humid.
The average wind speed is of 11 kph.
Sea iconThe average sea temperature is of 12.4 °C. Therefore, the sea is very cold for swimming.


July is generally a mild month. The average temperature is of 14.1 °C, with a minimum of 10.7 °C and a maximum of 17.4 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 7.5 °C. However, it dropped to 5.5 °C in July 1993.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 21.5 °C. However, it reached 28.9 °C in July 2015.
Rain iconPrecipitation amounts to only 5 mm, distributed over 5 days.
The day lasts on average 14 hours and 40 minutes. So the days are long.
Sun iconThere are on average 9 hours of sunshine per day. So, the sun shines 60% of the time.
The average humidity is 88%. Hence, the air is normally humid.
The average wind speed is of 9.5 kph.
Sea iconThe average sea temperature is of 13 °C. Therefore, the sea is very cold for swimming.


August, the warmest month of the year, is generally a mild month. The average temperature is of 14.4 °C, with a minimum of 10.7 °C and a maximum of 18.1 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 7 °C. However, it dropped to 5 °C in August 2002.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 23.5 °C. However, it reached 30 °C in August 2008.
Rain iconPrecipitation amounts to only 5 mm, distributed over 6 days.
The day lasts on average 13 hours and 40 minutes.
Sun iconThere are on average 7.5 hours of sunshine per day. So, the sun shines 56% of the time.
The average humidity is 89%. Hence, the air is normally humid.
The average wind speed is of 8.5 kph.
Sea iconThe average sea temperature is of 13.7 °C. Therefore, the sea is very cold for swimming.


September is generally a mild month. The average temperature is of 13.8 °C, with a minimum of 9.2 °C and a maximum of 18.4 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 5 °C. However, it dropped to 2.7 °C in September 1993.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 25.5 °C. However, it reached 35.6 °C in September 2017.
Rain iconPrecipitation amounts to 20 mm, distributed over 9 days.
The day lasts on average 12 hours and 25 minutes.
Sun iconThere are on average 7.5 hours of sunshine per day. So, the sun shines 59% of the time.
The average humidity is 87%. Hence, the air is normally humid.
The average wind speed is of 7.9 kph.
Sea iconThe average sea temperature is of 13.9 °C. Therefore, the sea is very cold for swimming.


October is generally a mild month. The average temperature is of 12.4 °C, with a minimum of 7.2 °C and a maximum of 17.5 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 2 °C. However, it dropped to -1.7 °C in October 2002.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 26.5 °C. However, it reached 33 °C in October 2003.
Rain iconPrecipitation amounts to 70 mm, distributed over 12 days.
The day lasts on average 11 hours and 5 minutes.
Sun iconThere are on average 5.5 hours of sunshine per day. So, the sun shines 51% of the time.
The average humidity is 84%. Hence, the air is normally humid.
The average wind speed is of 8.1 kph.
Sea iconThe average sea temperature is of 13.3 °C. Therefore, the sea is very cold for swimming.


November is generally a mild month. The average temperature is of 10.3 °C, with a minimum of 5.6 °C and a maximum of 14.9 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 0 °C. However, it dropped to -2.8 °C in November 2004.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 21 °C. However, it reached 26.1 °C in November 2002.
Rain iconPrecipitation amounts to 145 mm, distributed over 17 days.
The day lasts on average 9 hours and 55 minutes.
Sun iconThere are on average 4.5 hours of sunshine per day. So, the sun shines 44% of the time.
The average humidity is 84%. Hence, the air is normally humid.
The average wind speed is of 8.9 kph.
Sea iconThe average sea temperature is of 12.8 °C. Therefore, the sea is very cold for swimming.


December, the coldest month of the year, is generally a mild month. The average temperature is of 8.9 °C, with a minimum of 4.3 °C and a maximum of 13.4 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around -1.5 °C. However, it dropped to -5.1 °C in December 1998.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 19 °C. However, it reached 23.4 °C in December 1999.
Rain iconPrecipitation amounts to 225 mm, distributed over 19 days.
The day lasts on average 9 hours and 20 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
Sun iconThere are on average 4 hours of sunshine per day. So, the sun shines 44% of the time.
The average humidity is 83%. Hence, the air is normally humid.
The average wind speed is of 10.2 kph.
Sea iconThe average sea temperature is of 12 °C. Therefore, the sea is very cold for swimming.

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