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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, the same as December, in Guerneville, California, is another refreshing winter month, with temperature in the range of an average low of 42.3°F (5.7°C) and an average high of 57.7°F (14.3°C). The average high-temperature during January is a still refreshing 57.7°F (14.3°C), almost matching the conditions of the preceding month. Weather in January »
Weather in February
The last month of the winter, February, is another mild month in Guerneville, California, with temperature in the range of an average high of 59.2°F (15.1°C) and an average low of 41.9°F (5.5°C). The transition into February marks the average high-temperature at a still moderate 59.2°F (15.1°C), differing minimally from January's 57.7°F (14.3°C). Weather in February »
Weather in March
March, the first month of the spring in Guerneville, is still a refreshing month, with an average temperature fluctuating between 60.6°F (15.9°C) and 43°F (6.1°C). March brings a marginal elevation to a still refreshing 60.6°F (15.9°C) from February's 59.2°F (15.1°C) in Guerneville's average high-temperatures. Weather in March »
Weather in April
April in Guerneville, California, is a comfortable spring month, with an average temperature varying between 65.7°F (18.7°C) and 44.8°F (7.1°C). Guerneville, California, starts April with an average high-temperature of a still refreshing 65.7°F (18.7°C), hinting at a minimal fluctuation from March. Weather in April »
Weather in May
May, the last month of the spring in Guerneville, is an agreeable month, with temperature in the range of an average low of 47.5°F (8.6°C) and an average high of 69.6°F (20.9°C). Welcoming May, Guerneville notes an average high-temperature of an agreeable 69.6°F (20.9°C), nearly consistent with April's 65.7°F (18.7°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Guerneville, California, with an average temperature ranging between min 51.8°F (11°C) and max 77.2°F (25.1°C). June brings a slight rise in Guerneville's average high-temperature, moving from an agreeable 69.6°F (20.9°C) in May to a warm 77.2°F (25.1°C). Weather in June »
Weather in July
July, like June, in Guerneville, California, is another warm summer month, with an average temperature ranging between max 80.2°F (26.8°C) and min 53.1°F (11.7°C). The transition into July marks the average high-temperature at a still warm 80.2°F (26.8°C), differing minimally from June's 77.2°F (25.1°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Guerneville, California, with an average temperature varying between 81°F (27.2°C) and 53.4°F (11.9°C). In Guerneville, California, August is the month with the highest recorded average temperatures, measuring a high of 81°F (27.2°C) and a low of 53.4°F (11.9°C). For most parts of August, the heat index is computed to be 84.2°F (29°C). Weather in August »
Weather in September
September, the first month of the autumn in Guerneville, is also a moderately hot month, with an average temperature ranging between max 79.9°F (26.6°C) and min 53.4°F (11.9°C). The advent of September sees the average high-temperature at a still moderately hot 79.9°F (26.6°C), subtly shifted from August's 81°F (27.2°C). Weather in September »
Weather in October
October, like September, is an agreeable autumn month in Guerneville, California, with temperature in the range of an average low of 50.5°F (10.3°C) and an average high of 72.5°F (22.5°C). The commencement of October includes a gentle temperature shift, with the average high-temperature dropping a bit from a moderately hot 79.9°F (26.6°C) in September to an agreeable 72.5°F (22.5°C). Weather in October »
Weather in November
The last month of the autumn, November, is another comfortable month in Guerneville, California, with an average temperature ranging between max 63.5°F (17.5°C) and min 45.3°F (7.4°C). Onset of November witnesses a reduction in the average high-temperature, falling from an agreeable 72.5°F (22.5°C) in October to an enjoyable 63.5°F (17.5°C). Weather in November »
Weather in December
December, the first month of the winter in Guerneville, is also a moderate month, with an average temperature ranging between min 41.4°F (5.2°C) and max 56.3°F (13.5°C). December is the coldest month, exhibiting average temperatures of 56.3°F (13.5°C) at the peak and 41.4°F (5.2°C) at the base. Weather in December »
Updated: Feb 9, 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
How much does it rain in Guerneville?
Throughout the year, in Guerneville, there are 60.1 rainfall days, and 12.87" (327mm) of precipitation is accumulated.
What are the months with the lowest UV index in Guerneville?
January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Guerneville.
What is the rainiest month in Guerneville?
February is the month with the most rainfall. Rain falls for 7.3 days and accumulates 3.27" (83mm) of precipitation.
What is the most humid month in Guerneville?
With an average relative humidity of 77%, March is the most humid month in Guerneville.
When is Daylight Saving Time (DST) in Guerneville?
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.
When are the longest days in Guerneville?
June has the longest days of the year, with an average of 14h and 48min of daylight.
What are the months with the highest UV index in Guerneville?
The months with the highest UV index in Guerneville are June through August, with an average maximum UV index of 6.
What is the driest month in Guerneville?
The months with the least rainfall in Guerneville are July and August Rain falls for 1.3 days and accumulates 0.04" (1mm) of rain.
What month has the most sunshine in Guerneville?
The month with the most sunshine in Guerneville is July, with an average of 11.8h of sunshine.
What month is the hottest in Guerneville?
The warmest time of the year in Guerneville, California, is August, with temperatures averaging a high of 81°F (27.2°C) and a low of 53.4°F (11.9°C).
What is the least humid month in Guerneville?
The least humid month is September, with an average relative humidity of 62%.
What part of the year is the coldest in Guerneville?
The month of December sees the average lowest temperatures in Guerneville, reaching 56.3°F (13.5°C) at the peak and 41.4°F (5.2°C) at the low.
What is the month with the shortest days in Guerneville?
December has the shortest days of the year in Guerneville, California, with an average of 9h and 30min of daylight.
What is the month with the least sunshine in Guerneville?
With an average of 5.4h of sunshine, December has the least sunshine of the year in Guerneville.
Average temperature
Guerneville, CA
The warmest month (with the highest average high temperature) is August (81°F).
The month with the lowest average high temperature is December (56.3°F).
The months with the highest average low temperature are August and September (53.4°F).
The coldest month (with the lowest average low temperature) is December (41.4°F).
Average pressure
Guerneville, CA
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.07"Hg - Average pressure in March:
30.06"Hg - Average pressure in April:
30.03"Hg - Average pressure in May:
29.98"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.92"Hg - Average pressure in September:
29.92"Hg - Average pressure in October:
29.99"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.1"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed
Guerneville, CA
- Average wind speed in January:
5.3mph - Average wind speed in February:
6.2mph - Average wind speed in March:
6.5mph - Average wind speed in April:
7.1mph - Average wind speed in May:
7.2mph - Average wind speed in June:
6.9mph
- Average wind speed in July:
5.6mph - Average wind speed in August:
5.1mph - Average wind speed in September:
5.3mph - Average wind speed in October:
5.3mph - Average wind speed in November:
5mph - Average wind speed in December:
5.2mph
The windiest month (with the highest average wind speed) is May (7.2mph).
The calmest month (with the lowest average wind speed) is November (5mph).
Average humidity
Guerneville, CA
The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is September (62%).
Average rainfall
Guerneville, CA
- Average rainfall in January:
1.97" - Average rainfall in February:
3.27" - Average rainfall in March:
2.01" - Average rainfall in April:
0.51" - Average rainfall in May:
0.79" - Average rainfall in June:
0.12"
- Average rainfall in July:
0.04" - Average rainfall in August:
0.04" - Average rainfall in September:
0.08" - Average rainfall in October:
0.63" - Average rainfall in November:
1.1" - Average rainfall in December:
2.32"
The wettest month (with the highest rainfall) is February (3.27").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days
Guerneville, CA
- Average rainfall days in January:
8.1 days - Average rainfall days in February:
7.3 days - Average rainfall days in March:
10.3 days - Average rainfall days in April:
5.6 days - Average rainfall days in May:
4.8 days - Average rainfall days in June:
1.8 days
- Average rainfall days in July:
1.3 days - Average rainfall days in August:
0.9 days - Average rainfall days in September:
1.9 days - Average rainfall days in October:
3.6 days - Average rainfall days in November:
5.9 days - Average rainfall days in December:
8.6 days
The month with the highest number of rainy days is March (10.3 days).
The month with the least rainy days is August (0.9 days).
Average daylight / Average sunshine
Guerneville, CA
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 2min - Average daylight in June:
14h and 5min
- Average daylight in July:
14h and 3min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 1min - Average daylight in December:
9h and 3min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in January:
5h and 4min - Average sunshine in February:
5h and 5min - Average sunshine in March:
7h and 1min - Average sunshine in April:
9h and 5min - Average sunshine in May:
10h and 1min - Average sunshine in June:
11h and 2min
- Average sunshine in July:
11h and 5min - Average sunshine in August:
11h and 4min - Average sunshine in September:
10h and 5min - Average sunshine in October:
6h and 5min - Average sunshine in November:
6h and 2min - Average sunshine in December:
5h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days
Guerneville, CA
- Average sunshine days in January:
22 days - Average sunshine days in February:
19.9 days - Average sunshine days in March:
20 days - Average sunshine days in April:
23.3 days - Average sunshine days in May:
24.8 days - Average sunshine days in June:
27.3 days
- Average sunshine days in July:
28.9 days - Average sunshine days in August:
28.4 days - Average sunshine days in September:
27.9 days - Average sunshine days in October:
26.3 days - Average sunshine days in November:
23.5 days - Average sunshine days in December:
21.3 days
The month with the most sunshine days is July (28.9 days).
The month with the least sunshine days is February (19.9 days).
Average UV index
Guerneville, CA
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover
Guerneville, CA
The month with the most cloud cover is March (Cloud cover 42).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility
Guerneville, CA
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Guerneville, California, USA
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