Climate Comfort Score
97/100
Excellent
NOAA 1991–2020 normals 70°F annual avg Public-domain federal data
San Antonio, TX Climate
Average temperature, precipitation, and a comfort score, drawn from NOAA NCEI 1991–2020 normals →
- 70°F
- Avg annual temp
- 97/100
- Comfort score
- 32.4"
- Annual precip
- 275d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for San Antonio
San Antonio, Texas averages 70°F a year and scores 97/100 on the comfort index - excellent, milder than 98% of U.S. cities.
- 70°F
- annual average temperature (NOAA normal)
- 97/100
- comfort score, milder than 98% of U.S. cities
- 32.4"
- yearly precipitation total
- 275 days
- frost-free days per growing season
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
70°F (21°C)
Avg High
80°F
Avg Low
59°F
Annual Precip
32.4"
Annual Snow
0.2"
Comfort Score
97/100
Excellent
Avg Annual Temperature
70°F
30-year mean (NOAA NCEI)
Annual Precipitation
32.4"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (San Antonio) 97.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Excellent for the San Antonio area.
How San Antonio compares to every U.S. city
San Antonio's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
97 Top 2% higher than 98% of 6,915 US cities
Each bar is a band; taller bars hold more US cities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Warming context for San Antonio
MethodologyThe chart below traces how the U.S. land temperature anomaly has moved against the global mean since 1900. For San Antonio, the NOAA 1991-2020 normal captures average conditions across that spread - notably, the most recent decade runs warmer than the 30-year mean itself.
- United States land mean (NOAA NCEI) +0.11 °C/decade
- Global anomaly (NASA GISTEMP) +0.11 °C/decade
- Paris Agreement thresholds 1.5°C / 2.0°C
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 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 2.0"
6.9 days with precipitation
February 1.7"
Snow: 0.1"
7.4 days with precipitation
March 2.3"
8.5 days with precipitation
April 2.4"
6.4 days with precipitation
May 4.4"
8.3 days with precipitation
June 3.3"
7.0 days with precipitation
July 2.4"
5.0 days with precipitation
August 2.1"
4.7 days with precipitation
September 3.9"
6.9 days with precipitation
October 3.8"
6.4 days with precipitation
November 2.1"
6.4 days with precipitation
December 2.0"
Snow: 0.1"
7.4 days with precipitation
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% |
Nearby Cities
What San Antonio's climate means for you
San Antonio runs 70°F a year - peaking in August, coldest in January.
- Gardeners get about 275 frost-free days, with the last spring freeze near February 26 - plan the planting calendar around it, not the regional average.
- Energy bills track 1,438 heating and 3,148 cooling degree days a year, higher means the furnace or AC runs more.
- Comparing places to live? Line this city up against nearby cities and the national rankings. See rankings
These are 30-year NOAA normals (1991–2020) - the typical year, not a forecast for any specific season.
Climate Guides
Climate Insight: San Antonio, TX
San Antonio, Texas runs an annual average of 70°F, ranging from a mean daily high of 80°F to a mean daily low of 59°F, per NOAA's 1991–2020 climate normals. August is typically the warmest month of the year, while January is the coldest. Drawn from station USW00012921, these thirty-year averages smooth out year-to-year swings into a baseline for what a typical month looks like here.
Rainfall (and snow, where it falls) shapes day-to-day life here as much as temperature does. San Antonio sees about 32.4 inches of precipitation a year, with negligible snowfall. The frost-free season averages 275 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near February 26 and the first fall freeze near November 28. On the energy side, 1,438 heating degree days and 3,148 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, San Antonio scores 97/100 (Excellent), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Shoulder seasons bring the mildest highs and lows in the monthly tables above, summer brings August-driven heat, and winter brings January-driven cold - use that rhythm for planning. These figures are thirty-year averages rather than forecasts, so a specific year may still run warmer, cooler, wetter, or drier than what's shown.
Frequently Asked Questions
What is the average temperature in San Antonio, TX? ▼
The average annual temperature in San Antonio, Texas is 70°F. The warmest month averages 96°F (36°C) and the coldest averages 41°F (5°C).
How much rain does San Antonio get? ▼
San Antonio receives 32.4 inches of precipitation annually, including 0.2 inches of snow. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for San Antonio? ▼
San Antonio has a climate comfort score of 97/100 (Excellent), milder than 98% of U.S. cities in the PlainClimate database.
When is the growing season in San Antonio? ▼
San Antonio has approximately 275 frost-free days per year, with the last spring freeze around February 26 and the first fall freeze around November 28.
How much energy does heating and cooling require in San Antonio? ▼
San Antonio has 1,438 heating degree days and 3,148 cooling degree days annually, a cooling-dominated climate. See our <a href="/guides/reading-weather-data/" class="underline hover:text-brand-600">guide to reading weather data</a> for what these figures mean.
Where does this San Antonio climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USW00012921 near San Antonio.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USW00012921. For informational purposes only.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainClimate Editorial
Every figure on PlainClimate is rendered directly from NOAA 1991-2020 U.S. Climate Normals data, no number is typed in by an editor. This page draws directly on NOAA 1991-2020 U.S. Climate Normals data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.