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Hourly
7 Days
14 Days
Weekend
Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
San Marcos, TX
Content continues below
May
Average Temperature
High
30°
Feels 31
Low
19°
Feels 19
Average Precipitation
10 Days
Rain amount
112mm
Snow amount
0cm
Content continues below
Daily Historical Averages
May 2026
S
M
T
W
T
F
S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
32°
18
32°
19
32°
20
27°
21
28°
22
27°
23
28°
24
29°
25
30°
26
30°
27
30°
28
30°
29
30°
30
30°
31
30°
Forecast
Sunday, May 17, 2026
Day
32°
Feels 33
Wind
31 km/h S
Gust
47 km/h
Humidity
50%
P.O.P
70%
Rain
~1 mm
Night
24°
Feels 24
Wind
29 km/h S
Gust
44 km/h
Humidity
96%
P.O.P
60%
Rain
1-3 mm
Historical Averages
May 17
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.