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Monthly
Precipitation
Temperature
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Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
La Mesa, CA
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September
Average Temperature
High
28°
Feels 29
Low
17°
Feels 17
Average Precipitation
1 Days
Rain amount
5.3mm
Snow amount
0cm
Daily Historical Averages
September 2026
S
M
T
W
T
F
S
1
2
3
4
5
6
7
8
9
10
11
12
13
29°
14
30°
15
29°
16
29°
17
30°
18
31°
19
32°
20
31°
21
29°
22
29°
23
30°
24
30°
25
31°
26
31°
27
28°
28
29
30
Forecast
Sunday, September 13, 2026
Day
29°
Feels 29
Wind
12 km/h W
Gust
18 km/h
Humidity
49%
P.O.P
30%
Night
18°
Feels 18
Wind
10 km/h W
Gust
16 km/h
Humidity
99%
P.O.P
10%
Historical Averages
Sep 13
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.