Annual mean 21°C · wettest around May · prevailing wind SE
Warmest
34.2 °C
Coldest
14.8 °C
Wettest
18%
Windiest
5.1 m/s
Prevailing
SE
4.2 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 San Antonio over the whole year is 21°C. August is the hottest month, with highs of about 34°C; January is the coldest, with lows of about 7°C. San Antonio has no sharply defined rainy season: the chance of rain on a given day runs from 11% in February, the driest month, to 15% in May, the wettest. Winds in San Antonio are highest in May, averaging 4.2 m/s (15 km/h), and lightest in November, at 2.9 m/s (10 km/h). The prevailing wind is from the SE. The clearest skies in San Antonio come in August, when the sky is typically 48% covered; May is the cloudiest month, at 65%.
Month by month San Antonio 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
16°C
7°C
12°C
14%
53%
3.2 m/s
37
2
71
February
17°C
10°C
14°C
11%
59%
3.5 m/s
53
8
68
March
22°C
14°C
19°C
13%
63%
4.0 m/s
73
21
63
April
25°C
17°C
23°C
14%
62%
4.1 m/s
70
40
42
May
29°C
22°C
29°C
15%
65%
4.2 m/s
34
58
11
June
32°C
25°C
33°C
14%
57%
4.0 m/s
5
44
1
July
34°C
25°C
35°C
12%
53%
4.0 m/s
2
30
0
August
34°C
25°C
35°C
12%
48%
3.6 m/s
2
22
0
September
32°C
23°C
32°C
14%
51%
3.1 m/s
13
48
4
October
27°C
18°C
26°C
13%
49%
3.1 m/s
43
52
27
November
21°C
13°C
19°C
13%
59%
2.9 m/s
62
21
60
December
18°C
10°C
14°C
13%
57%
2.9 m/s
51
6
72
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 San Antonio weather by season
Year round, San Antonio has days of about 16°C at their warmest in January, its coolest month, and 34°C in August, its warmest; the coolest hours of the day run from 7°C to 25°C through the year, and the average temperature over the year is 21°C around the clock. Rain is most likely around May and least likely around February. 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.
San Antonio weather in winterDecember to February
High 17°CLow 9°CRain 13%
Winter in San Antonio has typical daily highs of about 17°C and lows of about 9°C, with a 13% chance of rain on a given day.
San Antonio weather in springMarch to May
High 26°CLow 18°CRain 14%
Spring in San Antonio has typical daily highs of about 26°C and lows of about 18°C, with a 14% chance of rain on a given day.
San Antonio weather in summerJune to August
High 33°CLow 25°CRain 13%
Summer in San Antonio has typical daily highs of about 33°C and lows of about 25°C, with a 13% chance of rain on a given day.
San Antonio weather in autumnSeptember to November
High 26°CLow 18°CRain 14%
Autumn in San Antonio has typical daily highs of about 26°C and lows of about 18°C, with a 14% chance of rain on a given day.
When is the rainy season in San Antonio?
San Antonio has no sharply defined rainy season: the chance of rain on a given day runs from 11% in February, the driest month, to 15% in May, the wettest.
What time of year is San Antonio windiest?
Winds in San Antonio are highest in May, averaging 4.2 m/s (15 km/h), and lightest in November, at 2.9 m/s (10 km/h). The prevailing wind is from the SE.
What is the average temperature in San Antonio year round?
The average temperature in San Antonio over the whole year is 21°C. August is the hottest month, with highs of about 34°C; January is the coldest, with lows of about 7°C.