Annual mean 14°C · wettest around December · prevailing wind SW
Warmest
24.8 °C
Coldest
11.6 °C
Wettest
45%
Windiest
4.2 m/s
Prevailing
SW
3.2 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Santa Rosa over the whole year is 14°C. August is the hottest month, with highs of about 24°C; December is the coldest, with lows of about 7°C. The rainy (wet) season in Santa Rosa runs from October to May, peaking in December with a 43% chance of rain on a given day. The dry season is June to September; July is the driest month, at 8%. Winds in Santa Rosa are highest in June, averaging 3.4 m/s (12 km/h), and lightest in November, at 1.9 m/s (7 km/h). The prevailing wind is from the SW. The clearest skies in Santa Rosa come in June, when the sky is typically 23% covered; January is the cloudiest month, at 54%.
Month by month Santa Rosa climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
12°C
7°C
10°C
43%
54%
2.2 m/s
11
0
76
February
14°C
7°C
11°C
41%
37%
2.5 m/s
25
0
76
March
15°C
8°C
12°C
43%
47%
2.6 m/s
30
1
79
April
17°C
9°C
16°C
36%
35%
2.9 m/s
58
7
81
May
20°C
11°C
19°C
32%
33%
3.2 m/s
70
17
72
June
23°C
13°C
23°C
17%
23%
3.4 m/s
72
34
54
July
23°C
13°C
24°C
8%
25%
3.2 m/s
70
45
43
August
24°C
14°C
25°C
12%
29%
2.9 m/s
69
48
40
September
24°C
13°C
24°C
20%
29%
2.5 m/s
73
39
47
October
21°C
11°C
20°C
31%
28%
2.1 m/s
77
22
66
November
16°C
8°C
14°C
39%
36%
1.9 m/s
45
1
87
December
12°C
7°C
10°C
43%
48%
2.0 m/s
10
0
75
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Santa Rosa weather by season
Year round, Santa Rosa has days of about 12°C at their warmest in December, its coolest month, and 24°C in August, its warmest; the coolest hours of the day run from 7°C to 14°C through the year, and the average temperature over the year is 14°C around the clock. Rain is most likely around December and least likely around July. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Santa Rosa weather in winterDecember to February
High 13°CLow 7°CRain 42%
Winter in Santa Rosa has typical daily highs of about 13°C and lows of about 7°C, with a 42% chance of rain on a given day.
Santa Rosa weather in springMarch to May
High 17°CLow 9°CRain 37%
Spring in Santa Rosa has typical daily highs of about 17°C and lows of about 9°C, with a 37% chance of rain on a given day.
Santa Rosa weather in summerJune to August
High 23°CLow 13°CRain 12%
Summer in Santa Rosa has typical daily highs of about 23°C and lows of about 13°C, with a 12% chance of rain on a given day.
Santa Rosa weather in autumnSeptember to November
High 20°CLow 10°CRain 30%
Autumn in Santa Rosa has typical daily highs of about 20°C and lows of about 10°C, with a 30% chance of rain on a given day.
When is the rainy season in Santa Rosa?
The rainy (wet) season in Santa Rosa runs from October to May, peaking in December with a 43% chance of rain on a given day. The dry season is June to September; July is the driest month, at 8%.
What time of year is Santa Rosa windiest?
Winds in Santa Rosa are highest in June, averaging 3.4 m/s (12 km/h), and lightest in November, at 1.9 m/s (7 km/h). The prevailing wind is from the SW.
What is the average temperature in Santa Rosa year round?
The average temperature in Santa Rosa over the whole year is 14°C. August is the hottest month, with highs of about 24°C; December is the coldest, with lows of about 7°C.