San Antonio, NM climate
San Antonio has chilly winters and hot summers, with very little rain. A typical July afternoon reaches 95°, a January night drops to 22°, and about 2 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in San Antonio feels like
Winter
Spring
Summer
Fall
San Antonio weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 55° | 22° | 0.4" | 0.3" | 2 | 0 | 32° – 43° |
| February | 61° | 26° | 0.3" | 0.1" | 3 | 0 | 40° – 48° |
| March | 69° | 32° | 0.4" | 0 | 2 | 0 | 47° – 56° |
| April | 77° | 39° | 0.3" | 0.1" | 2 | 0 | 53° – 63° |
| May | 86° | 47° | 0.5" | 0 | 3 | 0 | 64° – 71° |
| June | 95° | 56° | 0.5" | 0 | 3 | 0 | 72° – 79° |
| July | 95° | 62° | 1.8" | 0 | 8 | 0 | 74° – 82° |
| August | 92° | 60° | 1.9" | 0 | 9 | 0 | 73° – 80° |
| September | 87° | 53° | 1.4" | 0 | 6 | 0 | 65° – 73° |
| October | 77° | 40° | 0.9" | 0.1" | 5 | 0 | 55° – 62° |
| November | 64° | 29° | 0.5" | 0.5" | 3 | 0 | 40° – 53° |
| December | 54° | 22° | 0.7" | 0.9" | 3 | 0 | 33° – 43° |
| Year | 76° | 41° | 9.3" | 2.0" | 48 | 1 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in San Antonio
San Antonio gets 9 inches of rain and melted snow a year. August is the wettest month and April the driest. Rain or snow falls on about 48 days a year.
About 167 frost-free days a year
In half of years the last 32° night comes by April 28 and the first one by October 16. That leaves about 167 frost-free days for gardens, shorter than 64% of U.S. towns.
Heating and cooling a home in San Antonio
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In San Antonio, 73% of that work is heating and 27% is cooling.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
How San Antonio compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in San Antonio averaged 1.9° warmer than the 1900s. The biggest change is in March (+2.7°). The shift is larger than in 91% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at San Antonio’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. November swings the most: between 1991 and 2020 its average temperature ranged from 40° to 53°. August is the most reliable, staying within 7°.
Common questions about San Antonio’s climate
What is the coldest month in San Antonio?
January, with a typical high of 55° and a low of 22°.
What is the hottest month in San Antonio?
July, with a typical high of 95° and a low of 62°. About 123 days a year reach 90°.
How much snow does San Antonio get?
About 2 inches in a normal winter, most of it in December.
When is the first frost in San Antonio?
In half of years the first 32° night comes by October 16, and the last spring frost by April 28.
What is the rainiest month in San Antonio?
August, with 1.9 inches of rain and melted snow. The year totals 9 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for San Antonio itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Bosque Del Apache, NM (8 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.