Monthly weather forecast and climate
Eureka, CA

The Lost Fisherman
The Lost Fisherman's Memorial in scenic surroundings of Eureka, California

Weather in January

January, like December, in Eureka, California, is a cool winter month, with average temperature fluctuating between 44.2°F (6.8°C) and 53.8°F (12.1°C). In January, the average high-temperature is relatively the same as in December - a still cool 53.8°F (12.1°C). Weather in January »

Weather in February

The last month of the winter, February, is also a fresh month in Eureka, California, with average temperature ranging between min 42.4°F (5.8°C) and max 52.9°F (11.6°C). February and December, with an average high-temperature of 52.9°F (11.6°C), are the coldest months. Weather in February »

Weather in March

March, the first month of the spring, in Eureka, is still a cool month, with average temperature fluctuating between 43.2°F (6.2°C) and 53.8°F (12.1°C). In March, the average high-temperature is relatively the same as in February - a still cool 53.8°F (12.1°C). Weather in March »

Weather in April

April is a moderate spring month in Eureka, California, with temperature in the range of an average high of 55.9°F (13.3°C) and an average low of 44.2°F (6.8°C). In April, the average high-temperature is relatively the same as in March - a mild 55.9°F (13.3°C). Weather in April »

Weather in May

The last month of the spring, May, is another mild month in Eureka, California, with average temperature fluctuating between 59.9°F (15.5°C) and 46.4°F (8°C). In Eureka, the average high-temperature in May is practically the same as in April - a still mild 59.9°F (15.5°C). Weather in May »

Weather in June

June, the first month of the summer, in Eureka, is a comfortable month, with temperature in the range of an average low of 49.6°F (9.8°C) and an average high of 63.5°F (17.5°C). In June, the average high-temperature is relatively the same as in May - a comfortable 63.5°F (17.5°C). Weather in June »

Weather in July

July, the same as June, is another comfortable summer month in Eureka, California, with average temperature varying between 67.6°F (19.8°C) and 52.3°F (11.3°C). In July, the average high-temperature is essentially the same as in June - a still enjoyable 67.6°F (19.8°C). Weather in July »

Weather in August

August, the last month of the summer, in Eureka, is a pleasant month, with average temperature varying between 68.4°F (20.2°C) and 52.9°F (11.6°C). August is the warmest month, with an average high-temperature of 68.4°F (20.2°C) and an average low-temperature of 52.9°F (11.6°C). Weather in August »

Weather in September

September, the first month of the autumn, in Eureka, is still a pleasant month, with average temperature varying between 68.2°F (20.1°C) and 52.3°F (11.3°C). In Eureka, the average high-temperature is almost the same as in August - a still pleasant 68.2°F (20.1°C). Weather in September »

Weather in October

October, like September, in Eureka, California, is another enjoyable autumn month, with average temperature varying between 62.6°F (17°C) and 50°F (10°C). In October, the average high-temperature slightly decreases, from a pleasant 68.2°F (20.1°C) in September, to a comfortable 62.6°F (17°C). Weather in October »

Weather in November

November, the last month of the autumn, in Eureka, is also a moderate month, with temperature in the range of an average high of 56.5°F (13.6°C) and an average low of 46.4°F (8°C). In November, the average high-temperature slightly decreases, from a comfortable 62.6°F (17°C) in October, to a moderate 56.5°F (13.6°C). Weather in November »

Weather in December

December, the first month of the winter, in Eureka, is also a fresh month, with temperature in the range of an average low of 43.7°F (6.5°C) and an average high of 52.9°F (11.6°C). The coldest months are February and December, with an average high-temperature of 52.9°F (11.6°C). Weather in December »
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FAQ

How much does it rain in Eureka?

In Eureka, California, during the entire year, the rain falls for 77.3 days and collects up to 8.58" (218mm) of precipitation.

How much does it snow in Eureka?

Throughout the year, 0.04" (1mm) of snow is accumulated.

When it does not snow in Eureka?

In Eureka snow does not fall in January, March through December.

What is the month with the lowest UV index in Eureka?

January through March, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Eureka, California.

What is the coldest month in Eureka?

The coldest months in Eureka are February and December, with an average high-temperature of 52.9°F (11.6°C).

When does it snow in Eureka?

The only month with snowfall is February.

When does it snow the most in Eureka?

The month with the most snowfall is February when snow falls for 0.1 days and typically aggregates up to 0.04" (1mm) of snow.

What is the most humid month in Eureka?

The most humid month in Eureka, California, is March, with an average relative humidity of 82%.

When are the longest days in Eureka?

The month with the longest days in Eureka is June, with an average of 15.1h of daylight.

What is the driest month in Eureka?

The month with the least rainfall is July when the rain falls for 2.3 days and typically collects 0.08" (2mm) of precipitation.

What is the month with the most sunshine in Eureka?

July and August, with an average of 11.6h of sunshine, are months with the most sunshine in Eureka, California.

What is the month with the highest UV index in Eureka?

With an average maximum UV index of 5, July is the month with the highest UV index in Eureka, California.

What is the warmest month in Eureka?

With an average high-temperature of 68.4°F (20.2°C) and an average low-temperature of 52.9°F (11.6°C), August is the warmest month.

What is the least humid month in Eureka?

The least humid month in Eureka is October, with an average relative humidity of 76%.

What is the rainiest month in Eureka?

The month with the most rainfall is December when the rain falls for 10.8 days and typically aggregates up to 1.73" (44mm) of precipitation.

What is the month with the shortest days in Eureka?

With an average of 9.3h of daylight, December has the shortest days of the year in Eureka, California.

What is the month with the least sunshine in Eureka?

The month with the least sunshine is December, with an average of 5.2h of sunshine.

Average temperature
Eureka, CA

Average temperature - Eureka, CA

The warmest month (with the highest average high temperature) is August (68.4°F).
Months with the lowest average high temperature are February and December (52.9°F).

The month with the highest average low temperature is August (52.9°F).
The coldest month (with the lowest average low temperature) is February (42.4°F).

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Average pressure
Eureka, CA

Average pressure - Eureka, CA

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is August (29.96").

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Average wind speed
Eureka, CA

Average wind speed - Eureka, CA

The windiest month (with the highest average wind speed) is March (9mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).

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Average rainfall
Eureka, CA

Average rainfall - Eureka, CA

The wettest month (with the highest rainfall) is December (1.73").
The driest month (with the least rainfall) is July (0.08").

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Average rainfall days
Eureka, CA

Average rainfall days - Eureka, CA

The month with the highest number of rainy days is March (11.2 days).
The month with the least rainy days is August (1.7 days).

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Average snowfall
Eureka, CA

Average snowfall - Eureka, CA

The month with the highest snowfall is February (0.04").
Months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days
Eureka, CA

Average snowfall days - Eureka, CA

Months with the highest number of snowfall days are February and December (0.1 days).
Months with the least snowfall days are January, March, April, May, June, July, August, September, October and November (0 days).

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Average daylight / Average sunshine
Eureka, CA

Average daylight / Average sunshine - Eureka, CA

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

Months with the most sunshine are July and August (Average sunshine: 11.6h).
The month with the least sunshine is December (Average sunshine: 5.2h).

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Average sunshine days
Eureka, CA

Average sunshine days - Eureka, CA

The month with the most sunshine days is July (27.7 days).
The month with the least sunshine days is March (17.9 days).

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Average UV index
Eureka, CA

Average UV index - Eureka, CA

The month with the highest UV index is July (UV index 5).
Months with the lowest UV index are January, February, March, November and December (UV index 3).

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Average visibility
Eureka, CA

Average visibility - Eureka, CA

Months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).

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