San Antonio reaches 100° on about 37 days a year, more than 98% of U.S. towns
A typical July afternoon reaches 95°, a January night drops to 22°, and about 2 inches of snow falls in a normal winter.
A year in San Antonio at a glance
Each month’s typical high and low, and what it brings.
What stands out about San Antonio’s climate
Compared with towns across the U.S., with San Antonio’s place in New Mexico beside it.
What a year in San Antonio feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 167 frost-free days a year
In half of years the last 32° night comes by April 28 and the first by October 16. Frost and day counts come from NOAA’s station at Bosque Del Apache, NM, 8 miles from the town’s center, at about the same height.
The 2023 USDA map puts San Antonio’s center in zone 7b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 6°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 2 inches of snow a winter
Snow, measured at Bosque Del Apache, NM, falls mostly in December. Precipitation (rain plus melted snow) adds up to 9 inches a year; August is the wettest month and April the driest. Rain or snow falls on about 48 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in San Antonio
73% of the work is heating. Months averaging under 55° run from November through March.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Bosque Del Apache, NM.
Living with San Antonio’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
167 frost-free days in zone 7b. The last frost comes by Apr 28 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 16.
Months with highs of 62–84° and lows of 40° or more: October. 0.6 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in San Antonio from natural hazards, river flooding is the largest share (71%); heat waves, cold waves, winter storms and ice storms together are 3%. Normals are averages; the hazards page covers the extremes.
Natural hazards →San Antonio and similar climates
TownRatings has no climate map of the towns around San Antonio yet.
Climates most like San Antonio’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| San Antonio, NM | 22° | 95° | 9" | 2.0" |
| Silver Springs, NV | 23° | 95° | 5" | 4.5" |
| Star, ID | 24° | 93° | 11" | 7.4" |
| Guymon, OK | 22° | 94° | 18" | 2.7" |
| Homestead Meadows South, TX | 30° | 96° | 10" | 2.8" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
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°).
A bigger shift than in 85% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How San Antonio compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with San Antonio’s place among New Mexico’s.
San Antonio weather by month
Highs, lows and precipitation from NOAA’s grid at San Antonio’s center; snow, wet days and snow on the ground from Bosque Del Apache, NM. 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" | 0.0" | 2 | 0 | 47° – 56° |
| April | 77° | 39° | 0.3" | 0.1" | 2 | 0 | 53° – 63° |
| May | 86° | 47° | 0.5" | 0.0" | 3 | 0 | 64° – 71° |
| June | 95° | 56° | 0.5" | 0.0" | 3 | 0 | 72° – 79° |
| July | 95° | 62° | 1.8" | 0.0" | 8 | 0 | 74° – 82° |
| August | 92° | 60° | 1.9" | 0.0" | 9 | 0 | 73° – 80° |
| September | 87° | 53° | 1.4" | 0.0" | 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 |
How much a month can swing
A normal is an average. November swings the most: from 1991 to 2020 its average ranged from 40° to 53°. August is the most reliable, staying within 7°.
Where San Antonio’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at San Antonio’s center.
- Snow: Bosque Del Apache, NM.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Bosque Del Apache, NM, 8 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about San Antonio’s climate
What is the weather like in San Antonio?
A typical July afternoon reaches 95°, a January night drops to 22°, and about 2 inches of snow falls in a normal winter. Colder January nights than 51% of U.S. towns; hotter July afternoons than 95% of U.S. towns.
How cold does it get in San Antonio in winter?
January nights average 22°. About 143 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 32°.
How much snow does San Antonio get?
About 2.0 inches in a normal winter at Bosque Del Apache, NM, most of it in December, with snow on the ground about 1 days a year.
How hot does it get in San Antonio?
July, with a typical high of 95° and a low of 62°. About 123 days a year reach 90° and 37 reach 100° (Bosque Del Apache, NM).
When is the first and last frost in San Antonio?
In half of years the last spring frost (32°) comes by April 28 and the first fall frost by October 16, about 167 frost-free days, at Bosque Del Apache, NM.
What growing zone is San Antonio in?
Zone 7b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 6°.
What is the best time of year to visit San Antonio?
By one simple rule (highs of 62–84° and lows of 40° or more), October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is San Antonio getting warmer?
Yes: 1991–2020 averaged 1.9° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 85% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in San Antonio.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.