- WinterDec–Feb43°68°
- December42°67°
- January43°69°
- February44°68°
- SpringMar–May50°76°
- March47°72°
- April49°76°
- May55°81°
- SummerJun–Aug62°92°
- June59°87°
- July64°94°
- August64°95°
- AutumnSep–Nov55°83°
- September61°91°
- October55°83°
- November47°75°
San Bernardino, CA Weather by Month and Climate Averages
San Bernardino, CA gets 9.4 in of precipitation a year over about 35 rainy days. August is the warmest month (average high 95°F) and December the coldest (average low 42°F).
San Bernardino climate at a glance
Semi-arid climate
San Bernardino, CA has hot summers and warm winters. Daytime highs range from about 67°F in December to 95°F in August. February is usually the wettest month. The most comfortable time to visit is typically January, March to April, and November to December, when daytime highs sit near 72°F.
How much rain does San Bernardino get?
San Bernardino gets 9.4 in of precipitation in an average year, spread over about 35 days with measurable rain. That is fewer rainy days than 90% of the US.
February is the wettest month, with 2.4 in. June is the driest, with 0.0 in. February has the most rainy days, about 7.
The longest dry spell in the last five years lasted 201 days, to November 22, 2024.
See where San Bernardino ranks: rainiest cities in the US, US cities with the most rainy days, rainiest cities in California.
San Bernardino weather by month
San Bernardino weather in January
In January, San Bernardino averages a high of 69°F and a low of 43°F. It gets 2.3 in of precipitation over about 5 rainy days. The sun is out about 56% of daylight hours. The January record high is 101°F (2003) and the record low is 24°F (2007). January is one of the most comfortable months to visit.
San Bernardino weather in February
In February, San Bernardino averages a high of 68°F and a low of 44°F. It gets 2.4 in of precipitation over about 7 rainy days. The sun is out about 62% of daylight hours. The February record high is 93°F (2026) and the record low is 30°F (2002).
San Bernardino weather in March
In March, San Bernardino averages a high of 72°F and a low of 47°F. It gets 1.2 in of precipitation over about 5 rainy days. The sun is out about 50% of daylight hours. The March record high is 102°F (2026) and the record low is 30°F (2002). March is one of the most comfortable months to visit.
San Bernardino weather in April
In April, San Bernardino averages a high of 76°F and a low of 49°F. It gets 0.6 in of precipitation over about 4 rainy days. The sun is out about 65% of daylight hours. The April record high is 102°F (2004) and the record low is 32°F (1999). April is one of the most comfortable months to visit.
San Bernardino weather in May
In May, San Bernardino averages a high of 81°F and a low of 55°F. It gets 0.2 in of precipitation over about 2 rainy days. The sun is out about 71% of daylight hours. The May record high is 105°F (2003) and the record low is 39°F (2003).
San Bernardino weather in June
In June, San Bernardino averages a high of 87°F and a low of 59°F. It gets 0.0 in of precipitation over about 0 rainy days. The sun is out about 77% of daylight hours. The June record high is 114°F (2016) and the record low is 43°F (1999).
San Bernardino weather in July
In July, San Bernardino averages a high of 94°F and a low of 64°F. It gets 0.1 in of precipitation over about 1 rainy days. The sun is out about 82% of daylight hours. The July record high is 118°F (2018) and the record low is 52°F (2001).
San Bernardino weather in August
In August, San Bernardino averages a high of 95°F and a low of 64°F. It gets 0.0 in of precipitation over about 1 rainy days. The sun is out about 81% of daylight hours. The August record high is 112°F (2017) and the record low is 53°F (1999).
San Bernardino weather in September
In September, San Bernardino averages a high of 91°F and a low of 61°F. It gets 0.1 in of precipitation over about 1 rainy days. The sun is out about 81% of daylight hours. The September record high is 117°F (2020) and the record low is 49°F (2005).
San Bernardino weather in October
In October, San Bernardino averages a high of 83°F and a low of 55°F. It gets 0.3 in of precipitation over about 2 rainy days. The sun is out about 77% of daylight hours. The October record high is 107°F (2012) and the record low is 41°F (2006).
San Bernardino weather in November
In November, San Bernardino averages a high of 75°F and a low of 47°F. It gets 0.6 in of precipitation over about 4 rainy days. The sun is out about 71% of daylight hours. The November record high is 100°F (2010) and the record low is 27°F (2004). November is one of the most comfortable months to visit.
San Bernardino weather in December
In December, San Bernardino averages a high of 67°F and a low of 42°F. It gets 1.5 in of precipitation over about 5 rainy days. The sun is out about 53% of daylight hours. The December record high is 89°F (2021) and the record low is 25°F (1998). December is one of the most comfortable months to visit.
Sunshine, humidity and wind in San Bernardino
July is the sunniest month in San Bernardino, with sunshine about 82% of daylight hours. March is the cloudiest, at 50%. Over the year the sun shines about 69% of daylight hours. San Bernardino is sunnier than 96% of the US.
Humidity peaks in March at 54% and is lowest in November at 32%.
Wind averages 5 mph over the year, and June is the windiest month at 6 mph.
San Bernardino has about 95 days a year above 90°F. San Bernardino is hotter than 91% of the US.
Thunderstorms occur on about 5 days a year.
See where San Bernardino ranks: sunniest cities in the US, cloudiest cities in the US, hottest cities in the US.
San Bernardino weather records
The hottest temperature on record at the San Bernardino station is 118°F, on July 6, 2018. The coldest is 24°F, on January 14, 2007.
The wettest day on record brought 2.7 in of rain, on February 14, 2019.
The best time to visit San Bernardino
The most comfortable time to visit is typically January, March to April, and November to December, when daytime highs sit near 72°F.
Winter (December–February) is warm, with average highs around 68°F and lows near 43°F.
Spring (March–May) is warm, with average highs around 76°F and lows near 50°F.
Summer (June–August) is hot, with average highs around 92°F and lows near 62°F.
Autumn (September–November) is hot, with average highs around 83°F and lows near 55°F.
Monthly climate
| Month | Precip | Rain days | Wind | Humidity | Sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|
| January | 2.3 in | 5 | 5 mph | 44% | 56% | 101° | 24° |
| February | 2.4 in | 7 | 5 mph | 39% | 62% | 93° | 30° |
| March | 1.2 in | 5 | 5 mph | 54% | 50% | 102° | 30° |
| April | 0.59 in | 4 | 5 mph | 49% | 65% | 102° | 32° |
| May | 0.20 in | 2 | 5 mph | 50% | 71% | 105° | 39° |
| June | 0.01 in | 0 | 6 mph | 44% | 77% | 114° | 43° |
| July | 0.12 in | 1 | 5 mph | 39% | 82% | 118° | 52° |
| August | 0.02 in | 1 | 5 mph | 40% | 81% | 112° | 53° |
| September | 0.11 in | 1 | 4 mph | 40% | 81% | 117° | 49° |
| October | 0.33 in | 2 | 4 mph | 37% | 77% | 107° | 41° |
| November | 0.57 in | 4 | 4 mph | 32% | 71% | 100° | 27° |
| December | 1.5 in | 5 | 5 mph | 41% | 53% | 89° | 25° |
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
San Bernardino climate questions
How much rain does San Bernardino get?
San Bernardino gets 9.4 in of precipitation in an average year, over about 35 rainy days.
What is the wettest month in San Bernardino?
February is the wettest month in San Bernardino, with 2.4 in. June is the driest, with 0.0 in.
How many rainy days does San Bernardino have a year?
San Bernardino has about 35 days with measurable rain in an average year. February has the most, about 7.
What is the hottest month in San Bernardino?
August is the warmest month in San Bernardino, with an average high of 95°F.
What is the coldest month in San Bernardino?
December is the coldest month in San Bernardino, with an average low of 42°F.
What is the record high temperature in San Bernardino?
The record high at the San Bernardino station is 118°F, set on July 6, 2018. The record low is 24°F, on January 14, 2007.
What is the sunniest month in San Bernardino?
July is the sunniest month in San Bernardino, with sunshine about 82% of daylight hours. March is the cloudiest.
What is the best time to visit San Bernardino?
The most comfortable time to visit is typically January, March to April, and November to December, when daytime highs sit near 72°F.
Source: NOAA GHCN-Daily station RIVERSIDE MUNI AP (22 km away).
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Normals from NOAA GHCN-Daily station RIVERSIDE MUNI AP.