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Best time to visit Sonoma, CA, USA

Our verdict

The best time to visit Sonoma is September-October

Are you looking to travel to Sonoma and want to find out when’s the best time to visit? You’re in the right place! The perfect time to visit Sonoma is September-October due to the excellent weather conditions, and you might even find that the cost of flights and accommodation are lower than if you travel during the peak holiday seasons.

In the height of summer, temperatures in Sonoma can reach a maximum of 31℃ (88℉). The coldest it usually gets in winter-time in Sonoma is around 3℃ (37℉).

The longest days between sunrise and sunset in Sonoma are usually in July, so if you want to get the most out of your daytime activities, be sure to plan your visit around this time. On average it rains the most days in February, making it the wettest month of the year. Although it’s the wet season, it can often rain a little bit during the day or evening but have fine weather for a majority of the day too, so don’t let this put you off.

To learn everything you need to know (and none of the stuff you don’t) about when to visit Sonoma, keep reading below. Plus, you’ll find tools to help you get the best deals on travel and hotels too!

Warmest month

July

Least rainfall

August

Most daylight

July

Sonoma seasons

Before you continue, it’s important to know when the seasons are in Sonoma as they might be different to yours depending on where in the world you’re travelling from. Sonoma is in the Northern Hemisphere, so the seasons fall during these months:

SeasonMonths
Summer June to August
Autumn/fall September to November
Winter December to February
Spring March to May

Average temperatures in Sonoma

If the temperature is a big factor for you to help you decide when to visit, the chart below shows the average minimum and maximum temperatures in Sonoma for each month side-by-side so you can easily see the difference in weather throughout the year. To see the temperatures in both Celsius (°C) and Fahrenheit (°F), hover or tap the shaded boxes on the graph.

Sonoma climate by month

If you already have a rough idea about which months you might want to travel, the section below shows a detailed breakdown of the climate in Sonoma for each month so you can see if it all suits your wants and needs. Scroll down, or use the quick menu below to jump to your preferred month.

Jump to:

JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC

Sonoma in January

  • Average temperature: 9℃ (48℉)
  • Average high temperature: 14℃ (56℉)
  • Average low temperature: 6℃ (42℉)
  • Average humidity: 74%
  • Average sunny days: 20 days
  • Average rainfall: 73mm (3") over 10 days
20 days
of pure sunshine
10 days
of showers or rain

What to pack: If you’re heading to Sonoma in January, make sure you pack a warm jacket or coat.


Sonoma in February

  • Average temperature: 10℃ (50℉)
  • Average high temperature: 15℃ (59℉)
  • Average low temperature: 6℃ (42℉)
  • Average humidity: 74%
  • Average sunny days: 18 days
  • Average rainfall: 87mm (3") over 9 days
18 days
of pure sunshine
9 days
of showers or rain

What to pack: If you’re heading to Sonoma in February, make sure you pack a warm jacket or coat.


Sonoma in March

  • Average temperature: 11℃ (52℉)
  • Average high temperature: 16℃ (61℉)
  • Average low temperature: 6℃ (43℉)
  • Average humidity: 76%
  • Average sunny days: 16 days
  • Average rainfall: 63mm (2") over 13 days
16 days
of pure sunshine
13 days
of showers or rain

What to pack: If you’re heading to Sonoma in March, make sure you pack a warm jacket or coat.


Sonoma in April

  • Average temperature: 13℃ (56℉)
  • Average high temperature: 19℃ (67℉)
  • Average low temperature: 7℃ (45℉)
  • Average humidity: 70%
  • Average sunny days: 21 days
  • Average rainfall: 19mm (1") over 8 days
21 days
of pure sunshine
8 days
of showers or rain

What to pack: If you’re heading to Sonoma in April, make sure you pack a warm jacket or coat.


Sonoma in May

  • Average temperature: 16℃ (60℉)
  • Average high temperature: 22℃ (71℉)
  • Average low temperature: 9℃ (48℉)
  • Average humidity: 67%
  • Average sunny days: 24 days
  • Average rainfall: 19mm (1") over 5 days
24 days
of pure sunshine
5 days
of showers or rain

What to pack: If you’re heading to Sonoma in May, make sure you pack a coat or jumper for the evenings and some light clothes for the daytime.


Sonoma in June

  • Average temperature: 19℃ (66℉)
  • Average high temperature: 26℃ (79℉)
  • Average low temperature: 12℃ (53℉)
  • Average humidity: 62%
  • Average sunny days: 27 days
  • Average rainfall: 4mm (0") over 2 days
27 days
of pure sunshine
2 days
of showers or rain

What to pack: If you’re heading to Sonoma in June, make sure you pack a coat or jumper for the evenings, and t-shirts and light gear for the daytime.


Sonoma in July

  • Average temperature: 20℃ (68℉)
  • Average high temperature: 28℃ (82℉)
  • Average low temperature: 12℃ (54℉)
  • Average humidity: 62%
  • Average sunny days: 28 days
  • Average rainfall: 1mm (0") over 1 days
28 days
of pure sunshine
1 days
of showers or rain

What to pack: If you’re heading to Sonoma in July, make sure you pack t-shirts for the daytime and maybe a light jumper for the evenings as it cools down a bit.


Sonoma in August

  • Average temperature: 20℃ (67℉)
  • Average high temperature: 28℃ (82℉)
  • Average low temperature: 13℃ (55℉)
  • Average humidity: 64%
  • Average sunny days: 28 days
  • Average rainfall: 1mm (0") over 0 days
28 days
of pure sunshine
0 days
of showers or rain

What to pack: If you’re heading to Sonoma in August, make sure you pack t-shirts for the daytime and maybe a light jumper for the evenings as it cools down a bit.


Sonoma in September

  • Average temperature: 19℃ (67℉)
  • Average high temperature: 27℃ (81℉)
  • Average low temperature: 13℃ (55℉)
  • Average humidity: 59%
  • Average sunny days: 27 days
  • Average rainfall: 2mm (0") over 2 days
27 days
of pure sunshine
2 days
of showers or rain

What to pack: If you’re heading to Sonoma in September, make sure you pack t-shirts for the daytime and maybe a light jumper for the evenings as it cools down a bit.

Sonoma in October

  • Average temperature: 17℃ (62℉)
  • Average high temperature: 23℃ (73℉)
  • Average low temperature: 11℃ (52℉)
  • Average humidity: 60%
  • Average sunny days: 25 days
  • Average rainfall: 21mm (1") over 5 days
25 days
of pure sunshine
5 days
of showers or rain

What to pack: If you’re heading to Sonoma in October, make sure you pack a coat or jumper for the evenings and some light clothes for the daytime.


Sonoma in November

  • Average temperature: 12℃ (54℉)
  • Average high temperature: 17℃ (63℉)
  • Average low temperature: 8℃ (46℉)
  • Average humidity: 68%
  • Average sunny days: 23 days
  • Average rainfall: 35mm (1") over 6 days
23 days
of pure sunshine
6 days
of showers or rain

What to pack: If you’re heading to Sonoma in November, make sure you pack a warm jacket or coat.


Sonoma in December

  • Average temperature: 9℃ (48℉)
  • Average high temperature: 13℃ (55℉)
  • Average low temperature: 5℃ (42℉)
  • Average humidity: 73%
  • Average sunny days: 19 days
  • Average rainfall: 69mm (3") over 11 days
19 days
of pure sunshine
11 days
of showers or rain

What to pack: If you’re heading to Sonoma in December, make sure you pack a warm jacket or coat.


Top FAQs

The hottest month of the year in Sonoma is usually July, where temperatures tend to rise to around 28℃ (82℉) in the middle of the day or early afternoon.
The month with the least amount of rain in Sonoma is generally around August. The dry season often coincides with cooler weather, so you should check the temperatures in August first to make sure it’s still a good time to go.
The rainiest time of year in Sonoma is generally around February, although the wetter season can sometimes extend a few months either side of February too.
If you want to get the most out of your time visiting Sonoma, or if you're just afraid of the dark, the days in July are usually the longest between sunrise and sunset.

Sonoma map