The city is located 80 km (50 mi) northwest of San Francisco, and approximately 30 km (20 mi) away from the ocean. We are near the so-called North Coast of
, where the climate is more humid than in the central-southern part of the State.
, fog often forms at night and in the early morning. From November to March, rainfall is also frequent. On the
of the year, the temperature generally drops to -3/-5 °C (23/26.5 °F), even though in December 1990, it dropped to -9 °C (16 °F).
, there are strong temperature variations between night and day, so, even if it can get hot during the day, nights are generally cool (or even a little cold). Even in summer, fog can form at night and in the morning, while the ocean breeze cools the air in the afternoon and evening.
of the year, the temperature can reach 38/40 °C (100/104 °F), and this can also happen in September. It reached 43 °C (109.5 °F) in September 2017 and 44 °C (111 °F) in September 2020. These torrid temperatures occur when the wind blows from the deserts of California.
On the coast to the west of Santa Rosa (see Bodega Bay), the sea is cold even in summer, and the air too is much cooler: highs are below 20 °C (68 °F) even in the height of summer.
Santa Rosa can be visited from May to October. In May and October, it is rarely too hot, but sometimes it can rain. From June to September, the temperatures are generally pleasant (warm during the day and cool at night), but sometimes it can get very hot.
. Here are the average temperatures.
January is generally a mild month. The average temperature is of
8.7 °C, with a minimum of
3.1 °C and a maximum of
14.4 °C.
On the coldest nights of the month, the temperature usually drops to around
-2.5 °C. However, it dropped to
-6.7 °C in January 2007.
On the warmest days of the month, the temperature usually reaches around
20.5 °C. However, it reached
28 °C in January 2009.
Precipitation amounts to
170 mm, distributed over 12 days.
The day lasts on average 9 hours and 50 minutes.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is of
6 kph.
February is generally a mild month. The average temperature is of
10.3 °C, with a minimum of
4.1 °C and a maximum of
16.5 °C.
On the coldest nights of the month, the temperature usually drops to around
-1.5 °C. However, it dropped to
-3.9 °C in February 2018.
On the warmest days of the month, the temperature usually reaches around
23.5 °C. However, it reached
29.4 °C in February 2016.
Precipitation amounts to
170 mm, distributed over 11 days.
The day lasts on average 10 hours and 50 minutes.
The average humidity is 76%. Hence, the air is normally humid.
The average wind speed is of
7.8 kph.
March is generally a mild month. However, there are remarkable differences between night and day. The average temperature is of
11.8 °C, with a minimum of
5.2 °C and a maximum of
18.4 °C.
On the coldest nights of the month, the temperature usually drops to around
0.5 °C. However, it dropped to
-2.2 °C in March 2009.
On the warmest days of the month, the temperature usually reaches around
26 °C. However, it reached
31.7 °C in March 2004.
Precipitation amounts to
115 mm, distributed over 11 days.
The day lasts on average 12 hours and 0 minutes.
The average humidity is 72%. Hence, the air is normally humid.
The average wind speed is of
8.8 kph.
April is generally a mild month. However, there are remarkable differences between night and day. The average temperature is of
13.4 °C, with a minimum of
6.2 °C and a maximum of
20.6 °C.
On the coldest nights of the month, the temperature usually drops to around
1.5 °C. However, it dropped to
-2 °C in April 1998.
On the warmest days of the month, the temperature usually reaches around
30 °C. However, it reached
34.4 °C in April 2004.
Precipitation amounts to
55 mm, distributed over 8 days.
The day lasts on average 13 hours and 20 minutes.
The average humidity is 67%.
The average wind speed is of
9.8 kph.
May is generally a very mild month. However, there are remarkable differences between night and day. The average temperature is of
15.9 °C, with a minimum of
8.1 °C and a maximum of
23.7 °C.
On the coldest nights of the month, the temperature usually drops to around
4 °C. However, it dropped to
1.7 °C in May 2010.
On the warmest days of the month, the temperature usually reaches around
32.5 °C. However, it reached
38.9 °C in May 2008.
Precipitation amounts to
30 mm, distributed over 4 days.
The day lasts on average 14 hours and 20 minutes. So the days are long.
The average humidity is 64%.
The average wind speed is of
10.3 kph.
June is generally a warm month. However, there are remarkable differences between night and day. The average temperature is of
18.9 °C, with a minimum of
10.1 °C and a maximum of
27.7 °C.
On the coldest nights of the month, the temperature usually drops to around
6.5 °C. However, it dropped to
3.9 °C in June 1999.
On the warmest days of the month, the temperature usually reaches around
37 °C. However, it reached
42.2 °C in June 2000.
Precipitation amounts to
10 mm, distributed over 2 days.
The day lasts on average 14 hours and 50 minutes. So the days are long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
The average humidity is 59%.
The average wind speed is of
10.3 kph.
July is generally a warm month. However, there are remarkable differences between night and day. The average temperature is of
19.8 °C, with a minimum of
10.9 °C and a maximum of
28.6 °C.
On the coldest nights of the month, the temperature usually drops to around
8 °C. However, it dropped to
5 °C in July 2009.
On the warmest days of the month, the temperature usually reaches around
37.5 °C. However, it reached
42.2 °C in July 2006.
Precipitation amounts to only
0 mm, so on average it never rains in the whole month.
The day lasts on average 14 hours and 30 minutes. So the days are long.
The average humidity is 64%.
The average wind speed is of
9.5 kph.
August, the warmest month of the year, is generally a warm month. However, there are remarkable differences between night and day. The average temperature is of
20 °C, with a minimum of
11.1 °C and a maximum of
28.9 °C.
On the coldest nights of the month, the temperature usually drops to around
7.5 °C. However, it dropped to
5.5 °C in August 1995.
On the warmest days of the month, the temperature usually reaches around
37.5 °C. However, it reached
41.7 °C in August 2010.
Precipitation amounts to only
0 mm, so on average it never rains in the whole month.
The day lasts on average 13 hours and 35 minutes.
The average humidity is 64%.
The average wind speed is of
8.7 kph.
September is generally a warm month. However, there are remarkable differences between night and day. The average temperature is of
19.2 °C, with a minimum of
9.8 °C and a maximum of
28.6 °C.
On the coldest nights of the month, the temperature usually drops to around
6 °C. However, it dropped to
2.8 °C in September 2019.
On the warmest days of the month, the temperature usually reaches around
37.5 °C. However, it reached
43.9 °C in September 2020.
Precipitation amounts to only
5 mm, distributed over 2 days.
The day lasts on average 12 hours and 25 minutes.
The average humidity is 62%.
The average wind speed is of
7.7 kph.
October is generally a very mild month. However, there are remarkable differences between night and day. The average temperature is of
16.3 °C, with a minimum of
7.5 °C and a maximum of
25.1 °C.
On the coldest nights of the month, the temperature usually drops to around
2.5 °C. However, it dropped to
-2.8 °C in October 2019.
On the warmest days of the month, the temperature usually reaches around
34.5 °C. However, it reached
39 °C in October 1996.
Precipitation amounts to
40 mm, distributed over 4 days.
The day lasts on average 11 hours and 5 minutes.
The average humidity is 63%.
The average wind speed is of
7 kph.
November is generally a mild month. However, there are remarkable differences between night and day. The average temperature is of
11.5 °C, with a minimum of
4.5 °C and a maximum of
18.6 °C.
On the coldest nights of the month, the temperature usually drops to around
-1 °C. However, it dropped to
-5 °C in November 2015.
On the warmest days of the month, the temperature usually reaches around
26.5 °C. However, it reached
31.7 °C in November 2008.
Precipitation amounts to
90 mm, distributed over 9 days.
The day lasts on average 10 hours and 5 minutes.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is of
5.9 kph.
December, the coldest month of the year, is generally a quite mild month. The average temperature is of
8.4 °C, with a minimum of
2.7 °C and a maximum of
14.2 °C.
On the coldest nights of the month, the temperature usually drops to around
-3 °C. However, it dropped to
-6.1 °C in December 1998.
On the warmest days of the month, the temperature usually reaches around
20 °C. However, it reached
27.2 °C in December 2013.
Precipitation amounts to
170 mm, distributed over 13 days.
The day lasts on average 9 hours and 30 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is of
6.1 kph.