Annual mean 23°C · wettest around August · prevailing wind S
Warmest
30.8 °C
Coldest
26.6 °C
Wettest
96%
Windiest
4.6 m/s
Prevailing
S
3.7 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
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 23°C. April is the hottest month, with highs of about 31°C; February is the coldest, with lows of about 15°C. The rainy (wet) season in San Bernardino runs from May to November, peaking in August with a 82% chance of rain on a given day. The dry season is December to April; December is the driest month, at 19%. Winds in San Bernardino are highest in February, averaging 2.7 m/s (10 km/h), and lightest in May, at 1.8 m/s (6 km/h). The prevailing wind is from the S. The clearest skies in San Bernardino come in February, when the sky is typically 41% covered; June is the cloudiest month, at 79%.
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
28°C
16°C
27°C
37%
46%
2.4 m/s
28
33
31
February
28°C
15°C
27°C
41%
41%
2.7 m/s
25
32
30
March
30°C
19°C
30°C
42%
47%
2.2 m/s
25
28
21
April
31°C
20°C
31°C
50%
54%
2.0 m/s
26
19
19
May
30°C
20°C
31°C
63%
71%
1.8 m/s
27
19
18
June
27°C
19°C
29°C
79%
79%
1.8 m/s
32
25
24
July
27°C
18°C
28°C
78%
72%
2.1 m/s
36
14
36
August
28°C
18°C
29°C
82%
74%
1.9 m/s
34
17
27
September
27°C
19°C
28°C
81%
75%
1.8 m/s
36
19
32
October
27°C
18°C
28°C
80%
73%
2.0 m/s
34
18
31
November
27°C
18°C
28°C
52%
59%
2.2 m/s
30
21
31
December
28°C
17°C
28°C
19%
48%
2.3 m/s
25
30
29
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 27°C at their warmest in July, its coolest month, and 31°C in April, its warmest; the coolest hours of the day run from 15°C to 20°C through the year, and the average temperature over the year is 23°C around the clock. Rain is most likely around August and least likely around December. 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 28°CLow 16°CRain 32%
Winter in San Bernardino has typical daily highs of about 28°C and lows of about 16°C, with a 32% chance of rain on a given day.
San Bernardino weather in springMarch to May
High 30°CLow 19°CRain 51%
Spring in San Bernardino has typical daily highs of about 30°C and lows of about 19°C, with a 51% chance of rain on a given day.
San Bernardino weather in summerJune to August
High 27°CLow 18°CRain 80%
Summer in San Bernardino has typical daily highs of about 27°C and lows of about 18°C, with a 80% chance of rain on a given day.
San Bernardino weather in autumnSeptember to November
High 27°CLow 18°CRain 71%
Autumn in San Bernardino has typical daily highs of about 27°C and lows of about 18°C, with a 71% chance of rain on a given day.
When is the rainy season in San Bernardino?
The rainy (wet) season in San Bernardino runs from May to November, peaking in August with a 82% chance of rain on a given day. The dry season is December to April; December is the driest month, at 19%.
What time of year is San Bernardino windiest?
Winds in San Bernardino are highest in February, averaging 2.7 m/s (10 km/h), and lightest in May, at 1.8 m/s (6 km/h). The prevailing wind is from the S.
What is the average temperature in San Bernardino year round?
The average temperature in San Bernardino over the whole year is 23°C. April is the hottest month, with highs of about 31°C; February is the coldest, with lows of about 15°C.