- WinterDec–Feb43°70°
- December42°70°
- January43°70°
- February45°70°
- SpringMar–May52°75°
- March48°72°
- April51°76°
- May56°77°
- SummerJun–Aug63°86°
- June59°82°
- July63°87°
- August65°89°
- AutumnSep–Nov55°82°
- September62°88°
- October56°82°
- November47°76°
El Cajon, CA Weather by Month and Climate Averages
El Cajon, CA gets 11.6 in of precipitation a year over about 36 rainy days. August is the warmest month (average high 89°F) and December the coldest (average low 42°F).
El Cajon climate at a glance
Semi-arid climate
El Cajon, CA has hot summers and warm winters. Daytime highs range from about 70°F in December to 89°F in August. February is usually the wettest month. The most comfortable time to visit is typically January, March to May, and November to December, when daytime highs sit near 73°F.
How much rain does El Cajon get?
El Cajon gets 11.6 in of precipitation in an average year, spread over about 36 days with measurable rain. That is fewer rainy days than 90% of the US.
February is the wettest month, with 2.6 in. August 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 108 days, to August 8, 2022.
See where El Cajon ranks: rainiest cities in the US, US cities with the most rainy days, rainiest cities in California.
El Cajon weather by month
El Cajon weather in January
In January, El Cajon averages a high of 70°F and a low of 43°F. It gets 2.3 in of precipitation over about 6 rainy days. The sun is out about 56% of daylight hours. The January record high is 93°F (2021) and the record low is 26°F (2007). January is one of the most comfortable months to visit.
El Cajon weather in February
In February, El Cajon averages a high of 70°F and a low of 45°F. It gets 2.6 in of precipitation over about 7 rainy days. The sun is out about 60% of daylight hours. The February record high is 95°F (2002) and the record low is 28°F (1990).
El Cajon weather in March
In March, El Cajon averages a high of 72°F and a low of 48°F. It gets 1.9 in of precipitation over about 5 rainy days. The sun is out about 49% of daylight hours. The March record high is 101°F (2026) and the record low is 30°F (1988). March is one of the most comfortable months to visit.
El Cajon weather in April
In April, El Cajon averages a high of 76°F and a low of 51°F. It gets 0.8 in of precipitation over about 4 rainy days. The sun is out about 56% of daylight hours. The April record high is 104°F (1989) and the record low is 36°F (1999). April is one of the most comfortable months to visit.
El Cajon weather in May
In May, El Cajon averages a high of 77°F and a low of 56°F. It gets 0.3 in of precipitation over about 2 rainy days. The sun is out about 53% of daylight hours. The May record high is 104°F (2004) and the record low is 43°F (1999). May is one of the most comfortable months to visit.
El Cajon weather in June
In June, El Cajon averages a high of 82°F and a low of 59°F. It gets 0.1 in of precipitation over about 1 rainy days. The sun is out about 59% of daylight hours. The June record high is 107°F (2016) and the record low is 46°F (1999).
El Cajon weather in July
In July, El Cajon averages a high of 87°F and a low of 63°F. It gets 0.2 in of precipitation over about 1 rainy days. The sun is out about 66% of daylight hours. The July record high is 113°F (2006) and the record low is 50°F (2004).
El Cajon weather in August
In August, El Cajon averages a high of 89°F and a low of 65°F. It gets 0.0 in of precipitation over about 0 rainy days. The sun is out about 69% of daylight hours. The August record high is 107°F (1994) and the record low is 50°F (2000).
El Cajon weather in September
In September, El Cajon averages a high of 88°F and a low of 62°F. It gets 0.1 in of precipitation over about 1 rainy days. The sun is out about 67% of daylight hours. The September record high is 114°F (2020) and the record low is 49°F (1985).
El Cajon weather in October
In October, El Cajon averages a high of 82°F and a low of 56°F. It gets 0.5 in of precipitation over about 2 rainy days. The sun is out about 66% of daylight hours. The October record high is 106°F (1991) and the record low is 35°F (2011).
El Cajon weather in November
In November, El Cajon averages a high of 76°F and a low of 47°F. It gets 1.0 in of precipitation over about 3 rainy days. The sun is out about 67% of daylight hours. The November record high is 99°F (2008) and the record low is 29°F (1979). November is one of the most comfortable months to visit.
El Cajon weather in December
In December, El Cajon averages a high of 70°F and a low of 42°F. It gets 1.8 in of precipitation over about 5 rainy days. The sun is out about 54% of daylight hours. The December record high is 93°F (1979) and the record low is 25°F (1987). December is one of the most comfortable months to visit.
Sunshine, humidity and wind in El Cajon
August is the sunniest month in El Cajon, with sunshine about 69% of daylight hours. March is the cloudiest, at 49%. Over the year the sun shines about 60% of daylight hours. El Cajon is sunnier than 87% of the US.
Humidity peaks in March at 69% and is lowest in November at 50%.
El Cajon has about 44 days a year above 90°F. El Cajon is hotter than 64% of the US.
See where El Cajon ranks: sunniest cities in the US, cloudiest cities in the US, hottest cities in the US.
First and last freeze in El Cajon
The first fall freeze in El Cajon typically comes around December 17, and the last spring freeze around January 18. That leaves a frost-free growing season of about 333 days.
El Cajon weather records
The hottest temperature on record at the El Cajon station is 114°F, on September 5, 2020. The coldest is 25°F, on December 25, 1987.
The wettest day on record brought 3.8 in of rain, on December 22, 2010.
24 all-time records have been set at the station since 1979.
The best time to visit El Cajon
The most comfortable time to visit is typically January, March to May, and November to December, when daytime highs sit near 73°F.
Winter (December–February) is warm, with average highs around 70°F and lows near 43°F.
Spring (March–May) is warm, with average highs around 75°F and lows near 52°F.
Summer (June–August) is hot, with average highs around 86°F and lows near 63°F.
Autumn (September–November) is hot, with average highs around 82°F and lows near 55°F.
Monthly climate
| Month | Precip | Rain days | Humidity | Sunshine | Sea temp | Record high | Record low |
|---|---|---|---|---|---|---|---|
| January | 2.3 in | 6 | 61% | 56% | 59° | 93° | 26° |
| February | 2.6 in | 7 | 58% | 60% | 58° | 95° | 28° |
| March | 1.9 in | 5 | 69% | 49% | 59° | 101° | 30° |
| April | 0.75 in | 4 | 67% | 56% | 60° | 104° | 36° |
| May | 0.30 in | 2 | 68% | 53% | 63° | 104° | 43° |
| June | 0.06 in | 1 | 66% | 59% | 65° | 107° | 46° |
| July | 0.16 in | 1 | 67% | 66% | 68° | 113° | 50° |
| August | 0.02 in | 0 | 65% | 69% | 69° | 107° | 50° |
| September | 0.11 in | 1 | 64% | 67% | 69° | 114° | 49° |
| October | 0.54 in | 2 | 59% | 66% | 66° | 106° | 35° |
| November | 1.0 in | 3 | 50% | 67% | 62° | 99° | 29° |
| December | 1.8 in | 5 | 57% | 54% | 60° | 93° | 25° |
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
El Cajon climate questions
How much rain does El Cajon get?
El Cajon gets 11.6 in of precipitation in an average year, over about 36 rainy days.
What is the wettest month in El Cajon?
February is the wettest month in El Cajon, with 2.6 in. August is the driest, with 0.0 in.
How many rainy days does El Cajon have a year?
El Cajon has about 36 days with measurable rain in an average year. February has the most, about 7.
What is the hottest month in El Cajon?
August is the warmest month in El Cajon, with an average high of 89°F.
What is the coldest month in El Cajon?
December is the coldest month in El Cajon, with an average low of 42°F.
What is the record high temperature in El Cajon?
The record high at the El Cajon station is 114°F, set on September 5, 2020. The record low is 25°F, on December 25, 1987.
What is the sunniest month in El Cajon?
August is the sunniest month in El Cajon, with sunshine about 69% of daylight hours. March is the cloudiest.
When is the first frost in El Cajon?
The first fall freeze in El Cajon typically comes around December 17. The last spring freeze is around January 18.
What is the best time to visit El Cajon?
The most comfortable time to visit is typically January, March to May, and November to December, when daytime highs sit near 73°F.
Source: NOAA GHCN-Daily station EL CAJON (3 km away).
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Normals from NOAA GHCN-Daily station EL CAJON.