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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 35°C, while the coldest is January averaging around 5°C at night. Around 863 mm of precipitation falls each year, peaking in May (111 mm) and easing off in February (47 mm).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsSan Antonio climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 17 | 20 | 23 | 27 | 30 | 33 | 34 | 35 | 32 | 28 | 22 | 18 |
| Avg temp (°C) | 11 | 13 | 17 | 20 | 24 | 28 | 29 | 29 | 26 | 21 | 16 | 12 |
| Avg low (°C) | 5 | 7 | 11 | 14 | 19 | 22 | 23 | 23 | 20 | 15 | 9 | 5 |
| Precipitation (mm) | 56 | 47 | 60 | 59 | 111 | 90 | 61 | 62 | 99 | 100 | 63 | 54 |
| Snowfall (cm) | — | — | — | — | — | — | — | — | — | — | — | 0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 17 | 20 | 23 | 27 | 30 | 33 |
| Avg temp (°C) | 11 | 13 | 17 | 20 | 24 | 28 |
| Avg low (°C) | 5 | 7 | 11 | 14 | 19 | 22 |
| Precipitation (mm) | 56 | 47 | 60 | 59 | 111 | 90 |
| Snowfall (cm) | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 34 | 35 | 32 | 28 | 22 | 18 |
| Avg temp (°C) | 29 | 29 | 26 | 21 | 16 | 12 |
| Avg low (°C) | 23 | 23 | 20 | 15 | 9 | 5 |
| Precipitation (mm) | 61 | 62 | 99 | 100 | 63 | 54 |
| Snowfall (cm) | — | — | — | — | — | 0 |
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 ≥ 32°C (days) | — | 0.0 | 0.5 | 2 | 10 | 21 | 24 | 26 | 16 | 3 | 0.1 | — |
| Days with low ≤ 0°C (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 ≥ 32°C (days) | — | 0.0 | 0.5 | 2 | 10 | 21 |
| Days with low ≤ 0°C (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 ≥ 32°C (days) | 24 | 26 | 16 | 3 | 0.1 | — |
| Days with low ≤ 0°C (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.