El Cajon Climate by Month
El Cajon, California, United States
Hot summers and mild winters, with little rain, mostly from December to March.
Hot summers and mild winters, with little rain, mostly from December to March: that's El Cajon's climate in short. Expect highs of 89°F (32°C) in August and 69°F (21°C) in January, with the coldest nights (December) near 44°F (7°C). It gets only 11 in (280 mm) of rain a year. May to September are almost completely dry.
- Warmest month
- 89°F(32°C)
- Average high, August
- Coldest nights
- 44°F(7°C)
- Average low, December
- Rain per year
- 11 in(280 mm)
- Wettest: February
- Humidity
- 54%
- Sunniest: June
Best and worst months in El Cajon
Best for weatherApril, May and November are the best time for weather in El Cajon: highs near 76°F (25°C) and about 0.8 in (20 mm) of rain a month.
Least pleasantAugust and September are the least pleasant; August is the hottest, with highs of 89°F (32°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 April.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
El Cajon weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 69°F(21°C) | 45°F(7°C) | 2.0 in(50 mm) | 50% | 3.1 |
| FebFebruary | 70°F(21°C) | 46°F(8°C) | 2.4 in(60 mm) | 55% | 3.5 |
| MarMarch | 72°F(22°C) | 48°F(9°C) | 1.7 in(42 mm) | 57% | 5.0 |
| AprAprilBest | 76°F(24°C) | 51°F(10°C) | 1.0 in(26 mm) | 56% | 6.0 |
| MayMayBest | 77°F(25°C) | 55°F(13°C) | 0.3 in(8 mm) | 59% | 6.4 |
| JunJune | 81°F(27°C) | 58°F(15°C) | 0.1 in(2 mm) | 56% | 6.9 |
| JulJuly | 86°F(30°C) | 62°F(16°C) | 0.1 in(2 mm) | 59% | 6.7 |
| AugAugust | 89°F(32°C) | 63°F(17°C) | 0.1 in(2 mm) | 55% | 6.5 |
| SepSeptember | 88°F(31°C) | 62°F(17°C) | 0.2 in(4 mm) | 54% | 5.5 |
| OctOctober | 83°F(28°C) | 56°F(14°C) | 0.4 in(10 mm) | 48% | 4.3 |
| NovNovemberBest | 76°F(25°C) | 49°F(9°C) | 1.1 in(27 mm) | 47% | 3.4 |
| DecDecember | 69°F(21°C) | 44°F(7°C) | 1.9 in(47 mm) | 51% | 2.9 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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