Annual mean 17°C · wettest around January · prevailing wind W
Warmest
29.0 °C
Coldest
17.1 °C
Wettest
33%
Windiest
4.3 m/s
Prevailing
W
3.8 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in El Cajon over the whole year is 17°C. August is the hottest month, with highs of about 28°C; January is the coldest, with lows of about 8°C. The rainy (wet) season in El Cajon runs from November to May, peaking in January with a 31% chance of rain on a given day. The dry season is June to August; July is the driest month, at 3%. Winds in El Cajon are highest in May, averaging 2.6 m/s (9 km/h), and lightest in December, at 1.9 m/s (7 km/h). The prevailing wind is from the W. The clearest skies in El Cajon come in November, when the sky is typically 27% covered; May is the cloudiest month, at 60%.
Month by month El Cajon climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
18°C
8°C
14°C
31%
36%
2.1 m/s
50
1
86
February
18°C
8°C
14°C
29%
37%
2.4 m/s
51
4
81
March
18°C
9°C
15°C
30%
48%
2.4 m/s
54
3
85
April
21°C
11°C
18°C
19%
44%
2.5 m/s
73
9
83
May
21°C
14°C
18°C
22%
60%
2.6 m/s
81
10
82
June
24°C
16°C
23°C
8%
47%
2.5 m/s
81
32
57
July
27°C
18°C
27°C
3%
33%
2.4 m/s
60
60
26
August
28°C
19°C
28°C
12%
30%
2.3 m/s
52
67
18
September
27°C
17°C
26°C
19%
37%
2.2 m/s
65
53
32
October
26°C
14°C
23°C
15%
31%
2.0 m/s
81
34
55
November
22°C
10°C
19°C
25%
27%
2.0 m/s
79
12
78
December
19°C
8°C
15°C
27%
33%
1.9 m/s
60
1
87
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short El Cajon weather by season
Year round, El Cajon has days of about 18°C at their warmest in January, its coolest month, and 28°C in August, its warmest; the coolest hours of the day run from 8°C to 19°C through the year, and the average temperature over the year is 17°C around the clock. Rain is most likely around January and least likely around July. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
El Cajon weather in winterDecember to February
High 18°CLow 8°CRain 29%
Winter in El Cajon has typical daily highs of about 18°C and lows of about 8°C, with a 29% chance of rain on a given day.
El Cajon weather in springMarch to May
High 20°CLow 11°CRain 24%
Spring in El Cajon has typical daily highs of about 20°C and lows of about 11°C, with a 24% chance of rain on a given day.
El Cajon weather in summerJune to August
High 27°CLow 18°CRain 8%
Summer in El Cajon has typical daily highs of about 27°C and lows of about 18°C, with a 8% chance of rain on a given day.
El Cajon weather in autumnSeptember to November
High 25°CLow 14°CRain 20%
Autumn in El Cajon has typical daily highs of about 25°C and lows of about 14°C, with a 20% chance of rain on a given day.
When is the rainy season in El Cajon?
The rainy (wet) season in El Cajon runs from November to May, peaking in January with a 31% chance of rain on a given day. The dry season is June to August; July is the driest month, at 3%.
What time of year is El Cajon windiest?
Winds in El Cajon are highest in May, averaging 2.6 m/s (9 km/h), and lightest in December, at 1.9 m/s (7 km/h). The prevailing wind is from the W.
What is the average temperature in El Cajon year round?
The average temperature in El Cajon over the whole year is 17°C. August is the hottest month, with highs of about 28°C; January is the coldest, with lows of about 8°C.