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San Antonio, Texas climate

Cfa Humid subtropical

San Antonio has a seasonal warm-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 95°F, while the coldest is January averaging around 40°F at night. Around 34 inches of precipitation falls each year, peaking in May (4.4 inches) and easing off in February (1.9 inches).

☀️ Summers

Very hot

Highs near 95°F in August.

About 103 days a year above 90 °F

❄️ Winters

Cool

Lows near 40°F in January.

About 20 freezing nights a year

🌧️ Rain

Moderate rainfall

About 34 in of rain a year.

Wettest in May

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

−0.7 °F vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

San Antonio climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	63	68	74	80	86	92	94	95	90	82	71	64
Avg temp (°F)	52	56	62	69	76	82	84	85	79	71	60	53
Avg low (°F)	40	44	51	57	66	72	74	74	69	59	49	41
Precipitation (in)	2.2	1.9	2.4	2.3	4.4	3.6	2.4	2.4	3.9	3.9	2.5	2.1
Snowfall (in)	—	—	—	—	—	—	—	—	—	—	—	0.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	63	68	74	80	86	92
Avg temp (°F)	52	56	62	69	76	82
Avg low (°F)	40	44	51	57	66	72
Precipitation (in)	2.2	1.9	2.4	2.3	4.4	3.6
Snowfall (in)	—	—	—	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	94	95	90	82	71	64
Avg temp (°F)	84	85	79	71	60	53
Avg low (°F)	74	74	69	59	49	41
Precipitation (in)	2.4	2.4	3.9	3.9	2.5	2.1
Snowfall (in)	—	—	—	—	—	0.1

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	7	8	8	5	7	6	6	4	7	7	6	7
Days with high ≥ 90°F (days)	—	0.0	0.5	2	10	21	24	26	16	3	0.1	—
Days with low ≤ 32°F (days)	6	4	0.7	—	—	0.0	—	0.0	—	0.1	1	8

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	7	8	8	5	7	6
Days with high ≥ 90°F (days)	—	0.0	0.5	2	10	21
Days with low ≤ 32°F (days)	6	4	0.7	—	—	0.0

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	6	4	7	7	6	7
Days with high ≥ 90°F (days)	24	26	16	3	0.1	—
Days with low ≤ 32°F (days)	—	0.0	—	0.1	1	8

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	58	61	62	59	61	49	43	43	48	45	53	58
Clear days (≤ 30% cloud)	9	7	7	7	6	9	12	12	10	12	9	8
Partly cloudy days (30–70%)	8	8	9	9	11	13	13	13	12	10	10	8
Cloudy days (≥ 70%)	15	14	15	14	15	8	6	6	8	9	11	14
Relative humidity (%)	71	70	69	66	69	67	63	61	67	68	70	71
Wind speed (mph)	6.0	6.4	6.8	7.0	7.0	6.6	6.4	5.9	5.5	5.9	6.0	5.9

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	58	61	62	59	61	49
Clear days (≤ 30% cloud)	9	7	7	7	6	9
Partly cloudy days (30–70%)	8	8	9	9	11	13
Cloudy days (≥ 70%)	15	14	15	14	15	8
Relative humidity (%)	71	70	69	66	69	67
Wind speed (mph)	6.0	6.4	6.8	7.0	7.0	6.6

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	43	43	48	45	53	58
Clear days (≤ 30% cloud)	12	12	10	12	9	8
Partly cloudy days (30–70%)	13	13	12	10	10	8
Cloudy days (≥ 70%)	6	6	8	9	11	14
Relative humidity (%)	63	61	67	68	70	71
Wind speed (mph)	6.4	5.9	5.5	5.9	6.0	5.9

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at San Antonio Incarnate Word (NOAA GHCN station USC00417947), about 6 km from the city centre.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →