Monthly Historical AveragesSan Ysidro, CA
Average Temperature
High
19°
Feels 19
Low
14°
Feels 14
Average Precipitation
1 Days
3.5mm
0cm
Content continues below
Daily Historical Averages
S
M
T
W
T
F
S
ForecastSunday, May 17, 2026
Day
21°Feels 21
Wind
23 km/h SW
Gust
35 km/h
Humidity
58%
P.O.P
40%
Rain
<1 mm
Night
15°Feels 15
Wind
19 km/h S
Gust
28 km/h
Humidity
79%
P.O.P
40%
Rain
<1 mm
Historical AveragesMay 17
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity