Climate and monthly weather forecastEureka, CA
Climate and monthly weather forecast
Weather in January
January, the same as December, is a cool winter month in Eureka, California, with an average temperature ranging between max 53.8°F (12.1°C) and min 44.2°F (6.8°C). Eureka in January witnesses an average high-temperature of a still cool 53.8°F (12.1°C), indicating a slight variation from December's 52.9°F (11.6°C). Weather in January »Weather in February
The last month of the winter, February, is another cool month in Eureka, California, with an average temperature varying between 52.9°F (11.6°C) and 42.4°F (5.8°C). The coldest months are February and December, with an average high-temperature of 52.9°F (11.6°C). Weather in February »Weather in March
March, the first month of the spring in Eureka, is also a fresh month, with temperature in the range of an average high of 53.8°F (12.1°C) and an average low of 43.2°F (6.2°C). Shifting into March, Eureka records an average high-temperature of a still cool 53.8°F (12.1°C), presenting minor fluctuations compared to the previous month. Weather in March »Weather in April
April is a moderate spring month in Eureka, California, with an average temperature fluctuating between 55.9°F (13.3°C) and 44.2°F (6.8°C). Eureka's shift into April sets the average high-temperature at a mild 55.9°F (13.3°C), a figure that deviates only slightly from March's 53.8°F (12.1°C). Weather in April »Weather in May
May, the last month of the spring in Eureka, is also a moderate month, with an average temperature ranging between max 59.9°F (15.5°C) and min 46.4°F (8°C). The average high-temperature is a still moderate 59.9°F (15.5°C) in May, hardly different from the 55.9°F (13.3°C) recorded in April. Weather in May »Weather in June
June, the first month of the summer in Eureka, is an enjoyable 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). The introduction of June notes a subtle temperature variation to a comfortable 63.5°F (17.5°C) from May's 59.9°F (15.5°C). Weather in June »Weather in July
July, the same as June, is another comfortable summer month in Eureka, California, with an average temperature fluctuating between 52.3°F (11.3°C) and 67.6°F (19.8°C). Eureka observes a minor difference in average high-temperatures between June's 63.5°F (17.5°C) and July's 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 an average temperature varying between 52.9°F (11.6°C) and 68.4°F (20.2°C). August, marked by an average high-temperature of 68.4°F (20.2°C) and a low-temperature of 52.9°F (11.6°C), is the warmest month. Weather in August »Weather in September
September, the first month of the autumn in Eureka, is still a pleasant month, with an average temperature ranging between max 68.2°F (20.1°C) and min 52.3°F (11.3°C). Eureka experiences a minor change to a still pleasant 68.2°F (20.1°C) in average high-temperature during September, closely reflecting August. Weather in September »Weather in October
October, the same as September, is another refreshing autumn month in Eureka, California, with an average temperature fluctuating between 62.6°F (17°C) and 50°F (10°C). As October begins, there is a minor decrease in the average high-temperature, softly falling from an agreeable 68.2°F (20.1°C) in September to a refreshing 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 an average temperature ranging between min 46.4°F (8°C) and max 56.5°F (13.6°C). Eureka in November experiences a gentle temperature dip, with average high-temperatures reducing from an enjoyable 62.6°F (17°C) in October to a mild 56.5°F (13.6°C). Weather in November »Weather in December
The first month of the winter, December, is also a fresh month in Eureka, California, with an average temperature ranging between min 43.7°F (6.5°C) and max 52.9°F (11.6°C). Eureka witnesses its lowest temperatures in February and December, reaching an average of 52.9°F (11.6°C). Weather in December »Updated: Aug 23, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Throughout the year, there are 77.3 rainfall days, and 8.58" (218mm) of precipitation is accumulated.
January, March through December are months without snowfall.
Throughout the year, 0.04" (1mm) of snow is accumulated.
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 3.
February and December represent the coldest period, with an average high-temperature of 52.9°F (11.6°C).
The only month with snowfall is February.
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.
With an average relative humidity of 82%, March is the most humid month in Eureka, California.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.
June has the longest days of the year, with an average of 15h and 6min of daylight.
July is the month with the least rainfall. Rain falls for 2.3 days and accumulates 0.08" (2mm) of precipitation.
The months with the most sunshine are July and August, with an average of 11.6h of sunshine.
July is the month with the highest UV index, with an average maximum UV index of 5.
In Eureka, August records the average highest temperatures, peaking at 68.4°F (20.2°C) and reaching a low of 52.9°F (11.6°C).
The least humid month is October, with an average relative humidity of 76%.
December is the month with the most rainfall. Rain falls for 10.8 days and accumulates 1.73" (44mm) of precipitation.
December has the shortest days of the year, with an average of 9h and 18min of daylight.
With an average of 5.2h of sunshine, December has the least sunshine of the year.
Average temperature
Eureka, CA
The warmest month (with the highest average high temperature) is August (68.4°F).
The 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).
Average pressure
Eureka, CA
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.06"Hg - Average pressure in April:
30.07"Hg - Average pressure in May:
30.02"Hg - Average pressure in June:
29.99"Hg
- Average pressure in July:
29.98"Hg - Average pressure in August:
29.96"Hg - Average pressure in September:
29.97"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is August (29.96"Hg).
Average wind speed
Eureka, CA
- Average wind speed in January:
8mph - Average wind speed in February:
8.9mph - Average wind speed in March:
9mph - Average wind speed in April:
8.6mph - Average wind speed in May:
8.2mph - Average wind speed in June:
8.6mph
- Average wind speed in July:
7.1mph - Average wind speed in August:
6.2mph - Average wind speed in September:
6.5mph - Average wind speed in October:
7.4mph - Average wind speed in November:
7.6mph - Average wind speed in December:
8.5mph
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).
Average humidity
Eureka, CA
The month with the highest relative humidity is March (82%).
The month with the lowest relative humidity is October (76%).
Average rainfall
Eureka, CA
- Average rainfall in January:
1.26" - Average rainfall in February:
1.1" - Average rainfall in March:
1.02" - Average rainfall in April:
0.71" - Average rainfall in May:
0.67" - Average rainfall in June:
0.16"
- Average rainfall in July:
0.08" - Average rainfall in August:
0.12" - Average rainfall in September:
0.24" - Average rainfall in October:
0.51" - Average rainfall in November:
0.98" - Average rainfall in December:
1.73"
The wettest month (with the highest rainfall) is December (1.73").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days
Eureka, CA
- Average rainfall days in January:
9.8 days - Average rainfall days in February:
8.8 days - Average rainfall days in March:
11.2 days - Average rainfall days in April:
8.6 days - Average rainfall days in May:
5.5 days - Average rainfall days in June:
3.1 days
- Average rainfall days in July:
2.3 days - Average rainfall days in August:
1.7 days - Average rainfall days in September:
3.7 days - Average rainfall days in October:
4.9 days - Average rainfall days in November:
6.9 days - Average rainfall days in December:
10.8 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).
Average snowfall
Eureka, CA
The month with the highest snowfall is February (0.04").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days
Eureka, CA
- Average snowfall days in January:
0 days - Average snowfall days in February:
0.1 days - Average snowfall days in March:
0 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0 days - Average snowfall days in December:
0.1 days
The months with the highest number of snowfall days are February and December (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October and November (0 days).
Average daylight / Average sunshine
Eureka, CA
- Average daylight in January:
9h and 36min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 30min - Average daylight in June:
15h and 6min
- Average daylight in July:
14h and 48min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 54min - Average daylight in December:
9h and 18min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
5h and 18min - Average sunshine in February:
5h and 42min - Average sunshine in March:
6h and 48min - Average sunshine in April:
9h and 6min - Average sunshine in May:
10h and 0min - Average sunshine in June:
10h and 54min
- Average sunshine in July:
11h and 36min - Average sunshine in August:
11h and 36min - Average sunshine in September:
10h and 18min - Average sunshine in October:
6h and 42min - Average sunshine in November:
6h and 6min - Average sunshine in December:
5h and 12min
The months with the most sunshine are July and August (Average sunshine: 11h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 12min).
Average sunshine days
Eureka, CA
- Average sunshine days in January:
20.3 days - Average sunshine days in February:
18 days - Average sunshine days in March:
17.9 days - Average sunshine days in April:
20.1 days - Average sunshine days in May:
23.3 days - Average sunshine days in June:
25.5 days
- Average sunshine days in July:
27.7 days - Average sunshine days in August:
27.4 days - Average sunshine days in September:
25.6 days - Average sunshine days in October:
24.7 days - Average sunshine days in November:
21.5 days - Average sunshine days in December:
18.9 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).
Average UV index
Eureka, CA
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 3).
Average cloud cover
Eureka, CA
The month with the most cloud cover is March (Cloud cover 46).
The months with the least cloud cover are July and August (Cloud cover 16).
Average visibility
Eureka, CA
The 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).
