San Antonio, TX Climate: Temperature & Rain by Month
Average temperature and precipitation from NOAA NCEI 1991–2020 normals →, with a derived climate comfort score
30-year climate normals (1991-2020) from San Antonio's primary NOAA station, SAN ANTONIO INTL AP.
The climate verdict for San Antonio
Warm-season cooling demand defines San Antonio, Texas, running at more than twice its heating total. The NOAA normal records an annual average of 70°F. It scores 97/100 for climate comfort (excellent), putting it in the top third of station-mapped location scores and exceeding 97% of them.
- 70°F
- annual average temperature (NOAA normal)
- 97/100
- comfort score, above 97% of station-mapped location scores
- 32.4"
- yearly precipitation total
- 275 days
- frost-free days per growing season
San Antonio: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00012921 · San Antonio, TX 70°F mean · 32.4" precip
TEMP-MILD · RANK-WARM · PHOTO-FINISH · PRCP-MID · SWING-MID · COMF-TOP · LOAD-COOL · STN-1 · BOOK-FULL
- TEMP-MILD 70°F
- RANK-WARM #6,518
- PHOTO-FINISH ≈ Hondo
- PRCP-MID 32.4"
- SWING-MID 33°F
- COMF-TOP 97/100
- LOAD-COOL 3,148 CDD
- STN-1 USW00012921
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Hondo Muni, TX (+ 0 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every TX station list.
- San Antonio (this station) 70°F
- Cold Pinnacle Peak, AZ 70°F
- Hot Tucson Camp Ave, AZ 70°F
- Near Hondo, TX 70°F
- Near Conroe, TX 70°F
San Antonio sits in Texas, the #4 hottest U.S. state at 66.2°F statewide annual average - see all 50 hottest states ranked by NOAA normals
Climate Living Index · San Antonio
San Antonio: 76/100 · grade B
San Antonio publishes all six Living Index dimensions from NOAA annual/seasonal normals · NOAA daily multivariate normals · NOAA hourly normals.
PlainClimate-derived for San Antonio, not an official NOAA rating. Rankings still use Comfort Score 97/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Frost-free season | 275 days/year | 96/100 · A |
| Annual temperature balance | 69.6°F · 2.1° from 67.5°F | 93/100 · A |
| Precipitation balance | 32.4 in · 2.6 from 35 in | 90/100 · A |
| Snowfall burden | 0.2 inches/year | 89/100 · A |
| Normal heat + freeze calendar | 109 calendar days | 71/100 · B |
| Summer moisture balance | 69.1°F mean dew point | 17/100 · F |
San Antonio · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
San Antonio is a temperate Köppen climate: Cfa
Coldest-month mean 52.2°F and warmest-month mean 85.5°F place this station in temperate, no dry season, hot summer climates (Cfa). Class Cfa is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: temperate, specifically temperate, no dry season, hot summer.
- Köppen code
- Cfa
- Group
- Temperate
- Warmest month
- 85.5°F
- Coldest month
- 52.2°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · cooling-led station
Where San Antonio sits across the climate record
Three NOAA fields for San Antonio's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Top 5% warmest
- Among 6,861 stations, San Antonio sits in the warmer third of annual means.
- Annual precipitation
- 43rd percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Narrower than 86%
- Warmest-to-coldest month gap for San Antonio is compact versus 6,861 complete station-years.
How San Antonio compares across U.S. station-mapped locations
San Antonio's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
97 Top 3% score exceeds 97% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). Below this entry.
- 70–80: 650 station-mapped locations (11%). Below this entry.
- 80–90: 921 station-mapped locations (15%). Below this entry.
- 90–100: 564 station-mapped locations (9%). This entry sits in this band.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
San Antonio's measured station temperature trend
MethodologyAcross 127 complete annual observations from 1885 to 2025, SAN ANTONIO INTL AP warmed at a fitted rate of 0.15°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- San Antonio primary station fitted change +0.15 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 63°F (17°C) | 41°F (5°C) | 52°F (11°C) | 2.0" | 0.0" | 4.7 | 0.0 |
| February | 68°F (20°C) | 45°F (7°C) | 56°F (13°C) | 1.7" | 0.1" | 2.7 | 0.2 |
| March | 74°F (23°C) | 52°F (11°C) | 63°F (17°C) | 2.3" | 0.0" | 1.0 | 0.5 |
| April | 80°F (27°C) | 58°F (15°C) | 69°F (21°C) | 2.4" | 0.0" | 0.0 | 3.2 |
| May | 87°F (30°C) | 66°F (19°C) | 77°F (25°C) | 4.4" | 0.0" | 0.0 | 11.8 |
| June | 92°F (34°C) | 73°F (23°C) | 83°F (28°C) | 3.3" | 0.0" | 0.0 | 24.0 |
| July | 95°F (35°C) | 75°F (24°C) | 85°F (29°C) | 2.4" | 0.0" | 0.0 | 28.5 |
| August | 96°F (36°C) | 75°F (24°C) | 86°F (30°C) | 2.1" | 0.0" | 0.0 | 28.8 |
| September | 90°F (32°C) | 70°F (21°C) | 80°F (27°C) | 3.9" | 0.0" | 0.0 | 19.7 |
| October | 82°F (28°C) | 60°F (16°C) | 71°F (22°C) | 3.8" | 0.0" | 0.0 | 5.6 |
| November | 72°F (22°C) | 50°F (10°C) | 61°F (16°C) | 2.1" | 0.0" | 1.3 | 0.1 |
| December | 65°F (18°C) | 42°F (6°C) | 54°F (12°C) | 2.0" | 0.1" | 4.3 | 0.0 |
The year, day by day
The year in San Antonio runs from a mild 41°F around January 3 to 97°F at the peak near August 5, and the normal low never reaches freezing on any date in the record.
When the heat sits
Normal highs reach 90°F from May 30 through September 15, covering 109 dates. The broader mild season, normal highs of 70°F or more, runs February 28 to November 20.
This counts calendar dates whose 1991–2020 normal high reaches 90°F. It is a smaller number than the 90°F+ day counts in the monthly table above, which measure how often the threshold was actually crossed in a typical year. A date can average 88°F and still exceed 90°F in half of all years.
No freezing date
Not one calendar date in the 1991–2020 record carries a normal low at or below 32°F. The coldest normal low of the year is 41°F around January 3.
Where the wet dates fall
The likeliest wet date is March 7, when 27% of years recorded at least a hundredth of an inch. The driest is July 30 at 14%. Summed across the calendar, that is about 82 wet dates a year.
The widest day
February 6 carries the biggest normal gap between afternoon and dawn, 23°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for San Antonio.
Where San Antonio Stands Nationally
Summers here run among the most heat-heavy normals calendars in the country: on about 109 days a year the normal daily high itself reaches 90°F — a count fewer than one station in ten exceeds.
Days and nights track unusually close together; the widest normal swing, about 23°F, is narrower than most stations record.
San Antonio earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall and snowfall
6.9 days with precipitation
Snow: 0.1"
7.4 days with precipitation
8.5 days with precipitation
6.4 days with precipitation
8.3 days with precipitation
7.0 days with precipitation
5.0 days with precipitation
4.7 days with precipitation
6.9 days with precipitation
6.4 days with precipitation
6.4 days with precipitation
Snow: 0.1"
7.4 days with precipitation
San Antonio spreads its precipitation across the year
Neither half of the year dominates here: June through August take 24% of the annual total and December through February 18%, with neither reaching the 35% that would mark a distinct wet season. San Antonio has no dry season to plan around, though it does carry a 33.3°F seasonal spread.
The gap between the wettest and driest month still matters: May averages 4.4" and February 1.7". The three wettest months together take 37% of the year, against the 25% a perfectly flat distribution would give them.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. "Spread across the year" means neither the June-August nor the December-February share reaches 35%; it describes an average year, not the variability of any single one.
When it rains in San Antonio, it arrives in quantity
32.4" of precipitation falls across only about 81 wet days here, averaging 0.40 inches each. Fewer days carry more water: the year's total is delivered in comparatively heavy events rather than persistent damp.
- Days with measurable precipitation
- about 81 a year, 22% of all days
- Average depth per wet day
- 0.40 inches
- Most wet days
- March, about 9
- Fewest wet days
- August, about 5
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year, and a per-day average is not a forecast of any individual storm.
Snow reaches San Antonio, but rarely amounts to much
The normals record 0.2 inches of snow a year here, most likely in February. That is a real but marginal amount: enough that snow is part of the local record, not enough to define the winter.
A figure in this range usually reflects a handful of events that melt quickly rather than a season of accumulation; about 0 days a year record any measurable snow at all.
NOAA 1991-2020 normals. An average across thirty years can smooth away a single heavy winter, so a small annual figure does not mean a significant snowfall is impossible.
Frost Dates & Growing Season
First Fall Freeze
November 28
50% probability date
Last Spring Freeze
February 26
50% probability date
Growing Season
275 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
1,438
Higher = more heating needed
Cooling Degree Days
3,148
Higher = more cooling needed
Warmest Month
August
Coldest Month
January
Humidity & Wind
Monthly averages from hourly observations
| Month | Humidity | Wind (mph) | Clear Sky % | Overcast % |
|---|---|---|---|---|
| January | 63% | 7.6 | 25% | 40% |
| February | 61% | 8.5 | 23% | 38% |
| March | 65% | 9.4 | 20% | 41% |
| April | 64% | 9.8 | 20% | 38% |
| May | 68% | 9.3 | 12% | 18% |
| June | 67% | 9.2 | 12% | 16% |
| July | 62% | 8.5 | 16% | 9% |
| August | 63% | 7.4 | 15% | 13% |
| September | 63% | 7.1 | 31% | 15% |
| October | 65% | 7.8 | 31% | 29% |
| November | 64% | 7.4 | 27% | 35% |
| December | 62% | 7.5 | 27% | 39% |
Nationwide similar cities
Other rankable U.S. places outside TX closest to San Antonio on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (70°F here).
- Bushnell, FL 70°F · 0.0°F off
- Houma, LA 70°F · 0.0°F off
- Gainesville, FL 70°F · 0.1°F off
- Hackberry, LA 70°F · 0.1°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (32.4" here), excluding temperature-peer places.
- Fond Du Lac, WI 32.4" · 0.0" off
- Vanderbilt, MI 32.4" · 0.0" off
- Fairbury, NE 32.4" · 0.0" off
- Prentice, WI 32.4" · 0.0" off
Data-derived climate profile
How San Antonio's climate pattern fits together
cooling led · moderate · mid swing
Air-conditioning demand is the clearest thermal signal here. San Antonio accumulates 3,148 cooling degree days, more than twice its 1,438 heating total; the monthly table shows when that imbalance builds rather than treating it as a year-round condition.
San Antonio's 32.4 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Recorded annual snowfall is negligible. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
August and January mark the typical warm and cold ends of the calendar in San Antonio's middle-range seasonal profile. The measured spread is 33.3°F. The annual average is 70°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
The frost-free window extends for about 275 days. That is a long calendar measure, but it is not a forecast and does not combine heat, rainfall, soil, or local elevation into a planting recommendation.
These labels group NOAA 1991-2020 normals from San Antonio's primary station, so the summer figures are a thirty-year average rather than a ceiling: individual years have run hotter and will again. For San Antonio that means a descriptive range only — not an official NOAA classification and not a prediction for next summer.
Questions about San Antonio's climate
How much rain does San Antonio get? ▼
How many days above 90°F does San Antonio get? ▼
How much energy does heating and cooling require in San Antonio? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from San Antonio's primary station: SAN ANTONIO INTL AP (USW00012921). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as an incorporated place (GEOID 4865000). Match rule for San Antonio: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for San Antonio comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.