Monthly Historical AveragesLake San Marcos, CA
Average Temperature
High
21°
Feels 21
Low
13°
Feels 13
Average Precipitation
2 Days
6.2mm
0cm
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Daily Historical Averages
S
M
T
W
T
F
S
ForecastWednesday, May 20, 2026
Day
23°Feels 23
Wind
15 km/h W
Gust
23 km/h
Humidity
32%
P.O.P
0%
Night
15°Feels 15
Wind
8 km/h SW
Gust
12 km/h
Humidity
80%
P.O.P
10%
Historical AveragesMay 20
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity