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Contents
- The climate of Sonoma
- The best time to visit Sonoma
- The worst time to visit Sonoma
- Spring weather in Sonoma
- Summer weather in Sonoma
- Autumn weather in Sonoma
- Winter weather in Sonoma
- 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
Neat rows of vines in a vineyard farm in Sonoma, California
The climate of Sonoma
Located in California, USA, Sonoma lies within the realm of a Mediterranean climate, bearing the Köppen climate classification Csb. This classification presents itself through warm summers and relatively mild winters. With a thorough review of the climatological data provided, an understanding of the annual weather characteristics of Sonoma can be achieved.
A glance at the annual temperature parameters reveals considerable stability, with high temperatures ranging from 56.3°F (13.5°C) in winter to a warm 82.9°F (28.3°C) in summer. On the lower side of the scale, temperatures fluctuate from a cool 41.4°F (5.2°C) to a temperate 54.9°F (12.7°C).
In terms of rain, Sonoma experiences a wetter period from November to April with rainfall measurements peaking at 3.43" (87mm) in February. Contrastingly, the region goes through its driest period from May to October, with July and August recorded as the driest months with a mere 0.04" (1mm) of rain.
Relative humidity in Sonoma oscillates between 59% in September to a high of 76% in March. UV index also shifts throughout the year with the maximum value of 6 primarily noted in the summer months, while the winter sees a lower reading of 3.
A glance at the annual temperature parameters reveals considerable stability, with high temperatures ranging from 56.3°F (13.5°C) in winter to a warm 82.9°F (28.3°C) in summer. On the lower side of the scale, temperatures fluctuate from a cool 41.4°F (5.2°C) to a temperate 54.9°F (12.7°C).
In terms of rain, Sonoma experiences a wetter period from November to April with rainfall measurements peaking at 3.43" (87mm) in February. Contrastingly, the region goes through its driest period from May to October, with July and August recorded as the driest months with a mere 0.04" (1mm) of rain.
Relative humidity in Sonoma oscillates between 59% in September to a high of 76% in March. UV index also shifts throughout the year with the maximum value of 6 primarily noted in the summer months, while the winter sees a lower reading of 3.
The best time to visit Sonoma
A trip to Sonoma could optimally be planned between May and October. During this period, the region is least affected by rainfall, which remains under 1 inch, encouraging outdoor explorations. The lower humidity levels, ranging from 59% to 67%, further add to the general comfort. With consistent sunshine averaging between 10 hours to 14.8 hours per day complemented by daylight hours between 12.4 hours to 14.8 hours, visitors may find an abundance of time to explore the richness of the region.
The worst time to visit Sonoma
February could potentially pose challenges for visitors due to the higher rainfall measurement of 3.43" (87mm). Although temperatures stay within the range of 42.1°F (5.6°C) to 59°F (15°C), such weather conditions might deter outdoor activities. The increase in cloud cover to 35% further reduces the sunshine hours to 6 hours per day, limiting the potential for outdoor sightseeing and recreational activities.
Spring weather in Sonoma
Spring in Sonoma stretches from March to May encompassing gradual changes. March starts off cooler with high temperatures averaging 61.3°F (16.3°C) and low temperatures around 43°F (6.1°C). By May, the high temperatures climb up to 71.2°F (21.8°C) while the lows hover around 48.4°F (9.1°C). Rainfall largely decreases from 2.48" (63mm) in March to 0.75" (19mm) in May. Simultaneously, daylight and sunshine hours rise progressively to reach a high of 14.3 daylight hours and 10.6 sunshine hours in May.
Summer weather in Sonoma
Summer in Sonoma spanning from June to August, brings warmer conditions. High temperatures peak at 82.9°F (28.3°C) in July and August while the low temperatures steadily stay between 53.1°F (11.7°C) to 54.9°F (12.7°C). The summer months also mark the driest period with July and August receiving the lowest rainfall measurements of 0.04" (1mm). Extended daylight hours from 14.5 hours to 14.8 hours, coupled with abundant sunshine exceeding 11.5 hours per day, enhance the appeal of the summer season.
Autumn weather in Sonoma
The autumn months from September to November bring a decrease in temperature, with high temperatures dropping from 81.1°F (27.3°C) in September to 63.3°F (17.4°C) in November. Meanwhile, low temperatures fall from 54.7°F (12.6°C) to 46°F (7.8°C). Rainfall begins to show a gradual increase from 0.08" (2mm) in September to a substantial 1.38" (35mm) in November. Despite shorter daylight hours ranging from 12.4 hours to 10.1 hours, ample sunshine remains at an average of 7 hours per day.
Winter weather in Sonoma
Winter in Sonoma unfolds from December to February with high temperatures gradually diminishing from 55°F (12.8°C) in December to 56.3°F (13.5°C) in January and then rising to 59°F (15°C) in February. The low temperatures fluctuate between 41.4°F (5.2°C) to 42.1°F (5.6°C). Higher rainfall of 2.72" (69mm) in December and 3.43" (87mm) in February represent this season as the wettest period in Sonoma. The region also witnesses the shortest daylight hours, between 9.5 hours to 10.8 hours, and limited sunshine extending up to 6 hours in February.
Weather in January
Kicking off the year in Sonoma, California, the weather in January ushers in mild winter temperatures. The days tend to be cooler, leading to a chilly ambiance. Weather patterns fluctuate frequently with a larger portion of the month shrouded in cloud cover. Weather in January »
Weather in February
Moving on to February, the weather becomes marginally more moderate compared to January with a slight overall warm-up. Temperatures remain on the lower side but begin to regularize. The city of Sonoma experiences several rainy days compared to other months. Weather in February »
Weather in March
The arrival of March in Sonoma brings a sure sign that spring is on the horizon. With longer, warmer days than February, the true spirit of spring gradually begins to unfurl across the city. An uptick in relative humidity is noticeable, creating an overall fresh feel. Weather in March »
Weather in April
April treats Sonoma to more congenial weather, representing a milestone in the transition from spring to the blooming season. Temperatures tend to rise steadily, with the daily lows and highs gradually becoming more comfortable for outdoor activities. Weather in April »
Weather in May
May signals the onset of a period marked by sunnier, drier conditions in Sonoma. The weather in May greets locals and visitors with consistent warmth, minimal cloud coverage, and a significant decline in rainfall. The month witnesses a transition from balmy spring to the beginnings of a sweltering summer. Weather in May »
Weather in June
June heralds the beginning of summer in Sonoma, characterized by notably increased temperatures from May, reaching up to 79.5°F (26.4°C). As the mercury rises, rainfall becomes a rare event with practically no rainfall from June onward. Weather in June »
Weather in July
July sits in the heart of the summer season in Sonoma, boasting the highest temperatures of the year, peaking at 82.8°F (28.2°C). Nighttimes remain relatively cool, offering a welcome relief from the scorching heat of the day. The weather is predominantly arid, characterized by the conspicuous absence of rainfall. Weather in July »
Weather in August
In August, Sonoma's weather remains consistently hot and dry, mirroring the conditions of July. Aside from a tiny increase in temperature, the weather patterns persist with blazing sun, minimal rainfall, and clear skies. Increased sunshine hours and reduced cloud cover emphasize how firmly August is embedded in the summer season. Weather in August »
Weather in September
Come September, Sonoma experiences the onset of the transition from summer to fall. While the mercury continues to read high temperatures, there is a noticeable decrease from August. Outdoor experiences remain enjoyable owing to the significant duration of sunlight and relatively high daytime temperatures. Weather in September »
Weather in October
In October, Sonoma's weather begins to cool down as autumn gradually takes the reins from summer. Lower temperature readings and an increase in rainfall mark the onset of this seasonal shift. While cloud cover is on the rise, daylight hours start to decline, subtly signalling the shorter days of approaching winter. Weather in October »
Weather in November
As Sonoma rolls into November, it becomes evident that winter is on the horizon. The transitionary character of the weather unfolds further as temperatures decline considerably from the previous month. An increase in the number of rainy days testifies to the deepening autumnal characteristics. Weather in November »
Weather in December
December denotes the transition into winter with colder temperatures and a noticeable dip in daylight hours to just 9.5 hours daily. The weather takes a decidedly chilly turn, with both high and low temperatures dropping from November. Weather in December »
Updated: Jul 17, 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 many days does it rain?
In Sonoma, during the entire year, the rain falls for 73.3 days and collects up to 15.47" (393mm) of precipitation.
What are the months with the lowest UV index?
January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index.
What is the wettest month?
The month with the most rainfall is February, when the rain falls for 8.9 days and typically aggregates up to 3.43" (87mm) of precipitation.
What is the most humid month?
With an average relative humidity of 76%, March is the most humid month.
When is Daylight Saving Time (DST)?
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?
June has the longest days of the year, with an average of 14h and 48min of daylight.
What is the month with the highest UV index?
June and July, with an average maximum UV index of 6, are months with the highest UV index.
What is the driest month?
July and August are months with the least rain in Sonoma when the rain falls for 1.3 days and typically aggregates up to 0.04" (1mm) of rain.
What month has the most sunshine?
The month with the most sunshine is July, with an average of 12h of sunshine.
What part of the year is the hottest?
August is the month that records the highest temperatures, with averages ranging from a high of 82.9°F (28.3°C) to a low of 54.9°F (12.7°C).
What is the least humid month in Sonoma?
The least humid month in Sonoma is September, with an average relative humidity of 59%.
What is the coldest time of year?
Sonoma's coldest month, December, generally records average temperatures ranging from a high of 55°F (12.8°C) to a low of 41.4°F (5.2°C).
What is the month with the shortest days?
With an average of 9h and 36min of daylight, December has the shortest days of the year.
What is the month with the least sunshine?
December has the least sunshine of the year, with an average of 5.6h of sunshine.
Average temperature
Sonoma, CA
The warmest month (with the highest average high temperature) is August (82.9°F).
The month with the lowest average high temperature is December (55°F).
The month with the highest average low temperature is August (54.9°F).
The coldest month (with the lowest average low temperature) is December (41.4°F).
Average pressure
Sonoma, CA
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.07"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
30.03"Hg - Average pressure in May:
29.97"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
29.92"Hg - Average pressure in August:
29.92"Hg - Average pressure in September:
29.92"Hg - Average pressure in October:
29.98"Hg - Average pressure in November:
30.07"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 June (29.91"Hg).
Average wind speed
Sonoma, CA
- Average wind speed in January:
4.8mph - Average wind speed in February:
5.4mph - Average wind speed in March:
5.7mph - Average wind speed in April:
6mph - Average wind speed in May:
6.2mph - Average wind speed in June:
5.9mph
- Average wind speed in July:
5.3mph - Average wind speed in August:
5mph - Average wind speed in September:
4.8mph - Average wind speed in October:
4.6mph - Average wind speed in November:
4.4mph - Average wind speed in December:
4.8mph
The windiest month (with the highest average wind speed) is May (6.2mph).
The calmest month (with the lowest average wind speed) is November (4.4mph).
Average humidity
Sonoma, CA
The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is September (59%).
Average rainfall
Sonoma, CA
- Average rainfall in January:
2.87" - Average rainfall in February:
3.43" - Average rainfall in March:
2.48" - Average rainfall in April:
0.75" - Average rainfall in May:
0.75" - 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:
0.83" - Average rainfall in November:
1.38" - Average rainfall in December:
2.72"
The wettest month (with the highest rainfall) is February (3.43").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days
Sonoma, CA
- Average rainfall days in January:
10.4 days - Average rainfall days in February:
8.9 days - Average rainfall days in March:
13.4 days - Average rainfall days in April:
7.8 days - Average rainfall days in May:
5.1 days - Average rainfall days in June:
1.5 days
- Average rainfall days in July:
1.3 days - Average rainfall days in August:
0.8 days - Average rainfall days in September:
2.4 days - Average rainfall days in October:
4.6 days - Average rainfall days in November:
6.5 days - Average rainfall days in December:
10.6 days
The month with the highest number of rainy days is March (13.4 days).
The month with the least rainy days is August (0.8 days).
Average daylight / Average sunshine
Sonoma, 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 4min
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 36min).
- Average sunshine in January:
5h and 4min - Average sunshine in February:
6h and 0min - Average sunshine in March:
7h and 2min - Average sunshine in April:
10h and 0min - Average sunshine in May:
10h and 4min - Average sunshine in June:
11h and 3min
- Average sunshine in July:
12h and 0min - Average sunshine in August:
11h and 5min - Average sunshine in September:
11h and 0min - Average sunshine in October:
7h and 0min - Average sunshine in November:
6h and 2min - Average sunshine in December:
5h and 4min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).
Average sunshine days
Sonoma, CA
- Average sunshine days in January:
19.9 days - Average sunshine days in February:
17.9 days - Average sunshine days in March:
16.1 days - Average sunshine days in April:
21.3 days - Average sunshine days in May:
24.1 days - Average sunshine days in June:
26.8 days
- Average sunshine days in July:
28.7 days - Average sunshine days in August:
28.3 days - Average sunshine days in September:
26.7 days - Average sunshine days in October:
25.3 days - Average sunshine days in November:
22.9 days - Average sunshine days in December:
19.4 days
The month with the most sunshine days is July (28.7 days).
The month with the least sunshine days is March (16.1 days).
Average UV index
Sonoma, CA
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover
Sonoma, CA
The month with the most cloud cover is March (Cloud cover 40).
The month with the least cloud cover is July (Cloud cover 8).
Average visibility
Sonoma, 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).
Sonoma, California, USA
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