Annual mean 23°C · wettest around April · prevailing wind SW
Warmest
27.8 °C
Coldest
25.3 °C
Wettest
11%
Windiest
2.9 m/s
Prevailing
SW
2.4 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
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 23°C. September is the hottest month, with highs of about 27°C; January is the coldest, with lows of about 19°C. San Antonio has no sharply defined rainy season: the chance of rain on a given day runs from 6% in August, the driest month, to 16% in April, the wettest. Winds in San Antonio are highest in August, averaging 2.0 m/s (7 km/h), and lightest in April, at 1.6 m/s (6 km/h). The prevailing wind is from the SW. The clearest skies in San Antonio come in January, when the sky is typically 64% covered; April is the cloudiest month, at 73%.
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
26°C
19°C
28°C
8%
64%
1.8 m/s
40
68
13
February
27°C
20°C
28°C
9%
67%
1.8 m/s
39
66
13
March
26°C
20°C
28°C
14%
72%
1.7 m/s
41
61
14
April
26°C
20°C
28°C
16%
73%
1.6 m/s
38
63
13
May
26°C
20°C
28°C
15%
73%
1.7 m/s
37
63
12
June
26°C
20°C
28°C
12%
72%
1.7 m/s
41
66
13
July
27°C
20°C
28°C
7%
68%
1.9 m/s
38
68
12
August
27°C
20°C
28°C
6%
66%
2.0 m/s
36
69
12
September
27°C
20°C
28°C
10%
66%
1.9 m/s
35
66
12
October
26°C
19°C
28°C
15%
71%
1.7 m/s
42
64
13
November
26°C
19°C
28°C
16%
73%
1.6 m/s
44
64
14
December
26°C
19°C
28°C
10%
68%
1.6 m/s
42
67
13
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 26°C at their warmest in November, its coolest month, and 27°C in September, its warmest; the coolest hours of the day run from 19°C to 20°C through the year, and the average temperature over the year is 23°C around the clock. Rain is most likely around April and least likely around August. 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 26°CLow 19°CRain 9%
Winter in San Antonio has typical daily highs of about 26°C and lows of about 19°C, with a 9% chance of rain on a given day.
San Antonio weather in springMarch to May
High 26°CLow 20°CRain 15%
Spring in San Antonio has typical daily highs of about 26°C and lows of about 20°C, with a 15% chance of rain on a given day.
San Antonio weather in summerJune to August
High 27°CLow 20°CRain 8%
Summer in San Antonio has typical daily highs of about 27°C and lows of about 20°C, with a 8% chance of rain on a given day.
San Antonio weather in autumnSeptember to November
High 26°CLow 19°CRain 14%
Autumn in San Antonio has typical daily highs of about 26°C and lows of about 19°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 6% in August, the driest month, to 16% in April, the wettest.
What time of year is San Antonio windiest?
Winds in San Antonio are highest in August, averaging 2.0 m/s (7 km/h), and lightest in April, at 1.6 m/s (6 km/h). The prevailing wind is from the SW.
What is the average temperature in San Antonio year round?
The average temperature in San Antonio over the whole year is 23°C. September is the hottest month, with highs of about 27°C; January is the coldest, with lows of about 19°C.