May weather forecast and climate
Eureka, CA

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

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).

Temperature

In Eureka, the average high-temperature in May is practically the same as in April - a still mild 59.9°F (15.5°C). In May, the average low-temperature is 46.4°F (8°C).

Humidity

In May, the average relative humidity in Eureka, California, is 81%.

Rainfall

In Eureka, California, during May, the rain falls for 5.5 days and regularly aggregates up to 0.67" (17mm) of precipitation. In Eureka, during the entire year, the rain falls for 77.3 days and collects up to 8.58" (218mm) of precipitation.

Snowfall

January, March through December are months without snowfall in Eureka.

Daylight

The average length of the day in May is 14.5h.

Sunshine

In May, the average sunshine in Eureka is 10h.

UV index

In May, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 4 in May interpret into the following advice:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in May in Eureka?

In Eureka, in May, the average high-temperature is 59.9°F (15.5°C), and the average low-temperature is 46.4°F (8°C).

What is the average humidity in May in Eureka?

In May, the average relative humidity in Eureka, California, is 81%.

How much does it rain in Eureka in May?

In May, in Eureka, California, the rain falls for 5.5 days. Throughout May, 0.67" (17mm) of precipitation is accumulated.

When it does not snow in Eureka?

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

What is the average length of the day in May in Eureka?

In Eureka, California, the average length of the day in May is 14.5h.

How many hours of sunshine does Eureka have in May?

In May, the average sunshine in Eureka is 10h.

How high is the UV index in May in Eureka?

In Eureka, the average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a medium health risk from unprotected exposure to the UV radiation.

Average temperature in May
Eureka, CA

Average temperature in May - Eureka, CA
  • Average high temperature in May: 59.9°F

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).

  • Average low temperature in May: 46.4°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 in May
Eureka, CA

Average pressure in May - Eureka, CA
  • Average pressure in May: 30.02"

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 in May
Eureka, CA

Average wind speed in May - Eureka, CA
  • Average wind speed in May: 8.2mph

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 humidity in May
Eureka, CA

Average humidity in May - Eureka, CA
  • Average humidity in May: 81%

The month with the highest relative humidity is March (82%).
The month with the lowest relative humidity is October (76%).

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Average rainfall in May
Eureka, CA

Average rainfall in May - Eureka, CA
  • Average rainfall in May: 0.67"

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 in May
Eureka, CA

Average rainfall days in May - Eureka, CA
  • Average rainfall days in May: 5.5 days

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 in May
Eureka, CA

Average snowfall in May - Eureka, CA
  • Average snowfall in May: 0"

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 in May
Eureka, CA

Average snowfall days in May - Eureka, CA
  • Average snowfall days in May: 0 days

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 in May /
Average sunshine in May
Eureka, CA

Average daylight in May / Average sunshine in May - Eureka, CA
  • Average daylight in May: 14.5h

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

  • Average sunshine in May: 10h

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 in May
Eureka, CA

Average sunshine days in May - Eureka, CA
  • Average sunshine days in May: 23.3 days

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 in May
Eureka, CA

Average UV index in May - Eureka, CA
  • Average UV index in May: 4

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 cloud cover in May
Eureka, CA

Average cloud cover in May - Eureka, CA
  • Average cloud cover in May: 34

The month with the most cloud cover is March (Cloud cover 46).
Months with the least cloud cover are July and August (Cloud cover 16).

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Average visibility in May
Eureka, CA

Average visibility in May - Eureka, CA
  • Average visibility in May: 6mi

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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