Annual mean 18°C · wettest around March · prevailing wind W
Warmest
33.5 °C
Coldest
15.2 °C
Wettest
50%
Windiest
3.7 m/s
Prevailing
W
3.1 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 San Bernardino over the whole year is 18°C. July is the hottest month, with highs of about 33°C; January is the coldest, with lows of about 6°C. The rainy (wet) season in San Bernardino runs from October to May, peaking in March with a 46% chance of rain on a given day. The dry season is June to September; July is the driest month, at 22%. Winds in San Bernardino are highest in May, averaging 3.1 m/s (11 km/h), and lightest in December, at 1.8 m/s (6 km/h). The prevailing wind is from the W. The clearest skies in San Bernardino come in August, when the sky is typically 12% covered; March is the cloudiest month, at 35%.
Month by month San Bernardino 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
16°C
6°C
12°C
45%
28%
2.1 m/s
37
1
76
February
17°C
7°C
13°C
44%
27%
2.3 m/s
43
3
72
March
18°C
8°C
14°C
46%
35%
2.6 m/s
47
6
73
April
22°C
11°C
18°C
37%
28%
2.9 m/s
67
16
68
May
24°C
14°C
20°C
35%
31%
3.1 m/s
72
25
62
June
29°C
17°C
26°C
24%
19%
3.0 m/s
53
54
28
July
33°C
20°C
31°C
22%
12%
2.9 m/s
21
63
6
August
33°C
20°C
31°C
32%
12%
2.7 m/s
19
63
7
September
30°C
17°C
28°C
25%
19%
2.4 m/s
44
55
21
October
26°C
13°C
23°C
34%
17%
2.2 m/s
64
40
44
November
21°C
9°C
17°C
38%
18%
2.0 m/s
66
14
70
December
17°C
6°C
13°C
44%
25%
1.8 m/s
44
1
78
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 San Bernardino weather by season
Year round, San Bernardino has days of about 16°C at their warmest in January, its coolest month, and 33°C in July, its warmest; the coolest hours of the day run from 6°C to 20°C through the year, and the average temperature over the year is 18°C around the clock. Rain is most likely around March 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.
San Bernardino weather in winterDecember to February
High 16°CLow 6°CRain 44%
Winter in San Bernardino has typical daily highs of about 16°C and lows of about 6°C, with a 44% chance of rain on a given day.
San Bernardino weather in springMarch to May
High 21°CLow 11°CRain 39%
Spring in San Bernardino has typical daily highs of about 21°C and lows of about 11°C, with a 39% chance of rain on a given day.
San Bernardino weather in summerJune to August
High 32°CLow 19°CRain 26%
Summer in San Bernardino has typical daily highs of about 32°C and lows of about 19°C, with a 26% chance of rain on a given day.
San Bernardino weather in autumnSeptember to November
High 26°CLow 13°CRain 32%
Autumn in San Bernardino has typical daily highs of about 26°C and lows of about 13°C, with a 32% chance of rain on a given day.
When is the rainy season in San Bernardino?
The rainy (wet) season in San Bernardino runs from October to May, peaking in March with a 46% chance of rain on a given day. The dry season is June to September; July is the driest month, at 22%.
What time of year is San Bernardino windiest?
Winds in San Bernardino are highest in May, averaging 3.1 m/s (11 km/h), and lightest in December, at 1.8 m/s (6 km/h). The prevailing wind is from the W.
What is the average temperature in San Bernardino year round?
The average temperature in San Bernardino over the whole year is 18°C. July is the hottest month, with highs of about 33°C; January is the coldest, with lows of about 6°C.