San Jacinto, California Climate by Month
San Jacinto, California, United States
Very hot summers and cool winters, with little rain, mostly from December to April.
The climate in San Jacinto is one of very hot summers and cool winters, with little rain, mostly from December to April. August is the warmest month, with highs around 100°F (38°C); January is the coolest at 68°F (20°C), and nights dip to 37°F (3°C). It gets only 11 in (274 mm) of rain a year. May to September are almost completely dry. The air is dry, averaging 43% relative humidity.
- Warmest month
- 100°F(38°C)
- Average high, August
- Coldest nights
- 37°F(3°C)
- Average low, December
- Rain per year
- 11 in(274 mm)
- Wettest: February
- Humidity
- 43%
- Sunniest: June
Best and worst months in San Jacinto
Best for weatherThe most comfortable weather comes in April and November, with highs around 77°F (25°C) and about 1.0 in (26 mm) of rain a month.
Least pleasantJuly and August are the least pleasant; August is the hottest, with highs of 100°F (38°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 Jacinto weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 68°F(20°C) | 39°F(4°C) | 2.0 in(50 mm) | 43% | 3.0 |
| FebFebruary | 69°F(20°C) | 40°F(5°C) | 2.2 in(57 mm) | 48% | 3.5 |
| MarMarch | 72°F(22°C) | 43°F(6°C) | 1.4 in(36 mm) | 49% | 5.1 |
| AprAprilBest | 78°F(26°C) | 46°F(8°C) | 1.0 in(26 mm) | 47% | 6.1 |
| MayMay | 84°F(29°C) | 51°F(11°C) | 0.4 in(9 mm) | 43% | 6.8 |
| JunJune | 92°F(33°C) | 56°F(13°C) | 0.1 in(2 mm) | 42% | 7.3 |
| JulJuly | 98°F(37°C) | 60°F(16°C) | 0.2 in(5 mm) | 41% | 7.0 |
| AugAugust | 100°F(38°C) | 62°F(17°C) | 0.1 in(3 mm) | 39% | 6.7 |
| SepSeptember | 96°F(35°C) | 59°F(15°C) | 0.3 in(7 mm) | 38% | 5.7 |
| OctOctober | 87°F(30°C) | 51°F(10°C) | 0.4 in(11 mm) | 38% | 4.4 |
| NovNovemberBest | 76°F(25°C) | 43°F(6°C) | 1.0 in(25 mm) | 40% | 3.4 |
| DecDecember | 68°F(20°C) | 37°F(3°C) | 1.7 in(43 mm) | 45% | 2.8 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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