When to go · United States

When to go to San Bernardino

Twelve months of averages for San Bernardino, and what they say about when to go.

When to go

What the averages say

Mean daily highs and lows and the month's rain, averaged over 2001 to 2020.

On these averages, San Bernardino has a mean high between 18°C and 32°C and under 150 mm of rain in March to June, October and November.

Hot months (a mean high of 32°C or more): July to September.
The warmest month is August (34°C) and the coolest December (16°C). The wettest is February (63 mm) and the driest June (1 mm); about 290 mm of rain falls in a year.

How these sentences are worded

Each sentence is written from the figures by fixed rules, and says no more than they do. Mild to warm: a mean daily high from 18°C up to 32°C. Hot: 32°C or more. Cool: 10°C up to 18°C. Cold: under 10°C. Dry: under 50 mm of rain in the month; wet: 150 mm or more. Humid: a high of 25°C or more with relative humidity of 70% or more. A month is described as good for going when it is mild to warm and not wet.

San Bernardino: highs, lows and rainHighLowRain

The year at a glance

Mild to warm and dry
Mild to warm, humid or showery
Hot
Cool
Wet
Cold

JanCool
FebCool
MarMild–warm, dry
AprMild–warm, dry
MayMild–warm, dry
JunMild–warm, dry
JulHot
AugHot
SeptHot
OctMild–warm, dry
NovMild–warm, dry
DecCool

Month by month

Every month in San Bernardino

The whole year, with humidity, cloud and the sunlight reaching the ground.

Climate in San Bernardino by month: mean daily high and low, rain, and what the month is like
Month	High	Low	Rain	Humidity	Cloud	Sunlight (kWh/m²/day)	High in Dubai	What it is like
January	17°C	4°C	58 mm	55%	44%	3.3	23°C	Cool
February	17°C	5°C	63 mm	59%	40%	4.2	24°C	Cool
March	20°C	6°C	32 mm	59%	35%	5.6	27°C	Mild to warm and dry
April	22°C	8°C	18 mm	57%	30%	6.9	31°C	Mild to warm and dry
May	26°C	10°C	7 mm	55%	23%	7.8	35°C	Mild to warm and dry
June	30°C	14°C	1 mm	47%	15%	8.4	37°C	Mild to warm and dry
July	34°C	17°C	5 mm	41%	20%	7.9	39°C	Hot
August	34°C	18°C	3 mm	38%	16%	7.4	39°C	Hot
September	32°C	16°C	5 mm	40%	14%	6.3	37°C	Hot
October	27°C	12°C	16 mm	45%	23%	4.9	34°C	Mild to warm and dry
November	21°C	8°C	24 mm	47%	33%	3.7	29°C	Mild to warm and dry
December	16°C	4°C	58 mm	55%	43%	2.9	25°C	Cool

The Dubai column is Dubai's mean daily high, for comparison.

Modelled averages for an area about 50 km across, not a weather station's record: NASA POWER climatology, 2001–2020. These data were obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program.

The model's grid cell sits about 307 m higher than the town, so real temperatures there run a little warmer than these.

When to go nearby

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Plan a trip to San Bernardino

Tell us when and who is travelling, and a person puts the flights, the stays and the rest into one quote.

Plan a trip to San Bernardino More about San Bernardino When to go

Month

High

Low

Rain

Humidity

Cloud

Sunlight (kWh/m²/day)

High in Dubai

What it is like

January

17°C

4°C

58 mm

55%

44%

3.3

23°C

Cool

February

17°C

5°C

63 mm

59%

40%

4.2

24°C

Cool

March

20°C

6°C

32 mm

59%

35%

5.6

27°C

Mild to warm and dry

April

22°C

8°C

18 mm

57%

30%

6.9

31°C

Mild to warm and dry

May

26°C

10°C

7 mm

55%

23%

7.8

35°C

Mild to warm and dry

June

30°C

14°C

1 mm

47%

15%

8.4

37°C

Mild to warm and dry

July

34°C

17°C

5 mm

41%

20%

7.9

39°C

Hot

August

34°C

18°C

3 mm

38%

16%

7.4

39°C

Hot

September

32°C

16°C

5 mm

40%

14%

6.3

37°C

Hot

October

27°C

12°C

16 mm

45%

23%

4.9

34°C

Mild to warm and dry

November

21°C

8°C

24 mm

47%

33%

3.7

29°C

Mild to warm and dry

December

16°C

4°C

58 mm

55%

43%

2.9

25°C

Cool