Santa Rosa, CA weather and climate in 2024
Day
18 °C
Night
6 °C
Sea
13 °C
Precipitation
108 mm
in month
Rainy days
9 days
in month
Daylight
10 hours
average
Sunshine
6 hours
average
Humidity
77 %
Day
18 °C
Night
6 °C
Sea
13 °C
Precipitation
108 mm
in month
Rainy days
9 days
in month
Daylight
10 hours
average
Sunshine
6 hours
average
Humidity
77 %
Overview: Santa Rosa, CA
Weather charts for Santa Rosa, CA
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Weather overview for Santa Rosa, CA
Weather overview
Nestled in the heart of California's wine country, Santa Rosa's Mediterranean climate promises warm, dry summers and cool, wet winters. Expect daytime temperatures to soar up to 29 °C (85 °F) in July, with brisk evenings year-round as low as 4 °C (38 °F) in December. Annual rainfall averages around 161 mm (6.35 in) in February, dropping to a mere 0 mm (0.02 in) in July. Amidst the rolling vineyards, the crisp and diverse climate offers a refreshing escape with ample sunshine averaging up to 11 hours in June.
January weather
January in Santa Rosa greets you with chilly evenings as the mercury dips to about 4 °C (39 °F) at night. Daytime brings mild warmth with temperatures reaching 14 °C (57 °F). Rain is frequent, marking the off-peak of the wet season with a significant rainfall of 166 mm (6.54 in) and about 11 days of rain to expect.
February weather
As February arrives, Santa Rosa's climate begins a slow transition towards spring. Daytime highs inch upward to 17 °C (62 °F), while the nights remain cool at 5 °C (41 °F). February also maintains its reputation as the wettest month, so carry an umbrella for the 10 days of rain and 160 mm (6.31 in) of rainfall expected.
March weather
March in Santa Rosa sees the arrival of spring with a mix of rainy days and the beginning of warmer weather. Temperatures rise to a comfortable 18 °C (65 °F) during the day, while nights are still cool at about 6 °C (43 °F). Expect around 11 days of rainfall this month, with moisture levels at 121 mm (4.77 in).
April weather
April sees a significant shift in Santa Rosa's weather, moving towards drier patterns and warmer days. Daytime temperatures are pleasant at around 21 °C (69 °F) and with only 7 days of rainy days, it's a delightful time for outdoor pursuits. Night temperatures hover around 7 °C (45 °F).
May weather
As Santa Rosa marches into May, the warming trend continues with highs reaching 24 °C (75 °F). Nighttime temperatures are also on the rise, averaging 9 °C (49 °F). Expect progressively fewer rainy days with only about 4 days and a mere 27 mm (1.06 in) of rain.
June weather
June in Santa Rosa is characterized by longer days, abundant sunshine averaging 11 hours, and the onset of summer heat with temperatures averaging 27 °C (81 °F). The nights are comfortable at 12 °C (53 °F), and with the dry season in full swing, there's just a smattering of rain over 2 days.
July weather
Santa Rosa's July brings the peak of summer. Wander amidst hot, dry days with temperatures soaring to 29 °C (85 °F) and cool down during the still brisk nights averaging 12 °C (54 °F). The chances of rain are slim to none, with a record low 0 mm (0.02 in) of precipitation.
August weather
August in Santa Rosa continues the trend of high temperatures averaging 29 °C (84 °F) during the day. As nights begin to cool slightly to 12 °C (54 °F), the rainfall remains minimal with an average of 2 mm (0.08 in) across 1 day.
September weather
September in Santa Rosa offers lovely transitional weather as the heat begins to moderate. Expect daytime highs around 28 °C (83 °F), and comfy evening temperatures averaging 11 °C (52 °F). September also sees a slight uptick in rainy days to about 2 days with an increase in precipitation to 8 mm (0.32 in).
October weather
October in Santa Rosa sees the onset of Fall with a notable dip in daytime temperatures to 25 °C (76 °F). Nights can get quite nippy, averaging 9 °C (48 °F), and the chance of precipitation increases with 4 days of rainfall.
November weather
November's approach brings cooler weather to Santa Rosa. As the autumn leaves turn, the days cool to an average of 18 °C (65 °F), while nights grow colder at 6 °C (42 °F). The rainy season picks up with around 9 days of rain and an accumulation of 108 mm (4.23 in).
December weather
December winds down the year in Santa Rosa with the shortest days and a winter chill setting in. The daytime still reaches a brisk 14 °C (57 °F), while nights are cold at 4 °C (38 °F). Expect a fair amount of rain as December records about 11 days of precipitation.
FAQs
How cold does it get in Santa Rosa during January nights?
Santa Rosa's January nights can feel quite cold with temperatures averaging around 4 °C (39 °F), so ensure you're bundled up if you're stepping out after dusk.
Can I expect a lot of rain in Santa Rosa during February?
Santa Rosa in February is indeed wet, with a high chance of rain so it's wise to have rain gear handy with an average of 10 days of precipitation.
Does March in Santa Rosa bring a lot of rain?
March does bring its share of rainfall to Santa Rosa, with the ground often damp on average of 11 days throughout the month.
What is the average amount of precipitation in Santa Rosa during April?
April in Santa Rosa sees a noticeable reduction in rainfall with an average of 51 mm (2.00 in), indicating a drier month ahead.
What's the likelihood of rain in Santa Rosa during May?
Rain becomes increasingly rare in Santa Rosa throughout May, with rainfall dropping to roughly 27 mm (1.06 in) over just a few days.
Can I expect much rain in Santa Rosa this June?
Rain is virtually a non-issue in Santa Rosa during June, with drought-like conditions and negligible rainfall over a day or so.
Should I worry about rain at all in Santa Rosa during July?
Rain in Santa Rosa during July is exceedingly rare, making it the driest month with almost no rainfall, so no need for rain worries!
Is there any relief from the heat in Santa Rosa during August?
August days in Santa Rosa remain decidedly warm at an average of 29 °C (84 °F), but you may experience some relief during the cooler nights.
Does the temperature in Santa Rosa start to cool down in September?
Yes, September brings a gentle decline in temperatures in Santa Rosa, offering a respite from the peak summer heat with warm yet more tolerable days.
Are October temperatures in Santa Rosa conducive to spending time outdoors?
Outdoor activities in October are quite pleasant in Santa Rosa, thanks to the milder temperatures of 25 °C (76 °F) during the day.
Is November a rainy month in Santa Rosa?
November marks the return of the rainy season, so expect more wet days than in the previous months with a moderate amount of rainfall.
Will I need a warm jacket for Santa Rosa nights in December?
A warm jacket is definitely recommended for December nights in Santa Rosa, as temperatures can drop to around 4 °C (38 °F).
We make the most from 40 years of historical weather data to predict the best weather conditions.
Deciding on where to go for a holiday is hard sometimes. Get inspired by the most popular destinations.
We aggregate data from combining multiple weather sources to ensure accuracy of the highest order.