San Bernardino Climate by Month
San Bernardino, California, United States
Very hot summers and cool winters, with little rain, mostly from December to March.
The climate in San Bernardino is one of very hot summers and cool winters, with little rain, mostly from December to March. Expect highs of 97°F (36°C) in August and 68°F (20°C) in December, with the coldest nights (December) near 41°F (5°C). It gets only 11 in (272 mm) of rain a year. May to September are almost completely dry. The air is dry, averaging 42% relative humidity.
- Warmest month
- 97°F(36°C)
- Average high, August
- Coldest nights
- 41°F(5°C)
- Average low, December
- Rain per year
- 11 in(272 mm)
- Wettest: February
- Humidity
- 42%
- Sunniest: June
Best and worst months in San Bernardino
Best for weatherApril and November are the best time for weather in San Bernardino: highs near 77°F (25°C) and about 0.7 in (19 mm) of rain a month.
Least pleasantJuly and August are the least pleasant; August is the hottest, with highs of 97°F (36°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in November.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
San Bernardino weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 68°F(20°C) | 43°F(6°C) | 2.2 in(55 mm) | 47% | 2.9 |
| FebFebruary | 69°F(21°C) | 44°F(7°C) | 2.6 in(66 mm) | 45% | 3.4 |
| MarMarch | 73°F(23°C) | 47°F(8°C) | 1.7 in(42 mm) | 46% | 5.0 |
| AprAprilBest | 78°F(26°C) | 49°F(10°C) | 0.8 in(21 mm) | 45% | 6.0 |
| MayMay | 82°F(28°C) | 55°F(13°C) | 0.3 in(7 mm) | 46% | 6.7 |
| JunJune | 89°F(32°C) | 59°F(15°C) | 0.1 in(2 mm) | 42% | 7.3 |
| JulJuly | 96°F(35°C) | 64°F(18°C) | 0.1 in(2 mm) | 41% | 7.0 |
| AugAugust | 97°F(36°C) | 65°F(18°C) | 0.1 in(3 mm) | 39% | 6.7 |
| SepSeptember | 93°F(34°C) | 61°F(16°C) | 0.2 in(5 mm) | 41% | 5.7 |
| OctOctober | 85°F(29°C) | 54°F(12°C) | 0.4 in(11 mm) | 37% | 4.3 |
| NovNovemberBest | 76°F(24°C) | 46°F(8°C) | 0.7 in(17 mm) | 38% | 3.3 |
| DecDecember | 68°F(20°C) | 41°F(5°C) | 1.6 in(41 mm) | 41% | 2.7 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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