San Antonio has a warm subtropical climate with warm summers and mild winters.
Temperatures peak in August and drop to their lowest in January, while rainfall is highest during spring and early summer months.
Humidity remains moderate throughout the year, especially during winter months, creating cold and damp conditions.
| Month | 🌤️ | Avg High | Avg Temp | Avg Low | Record High | Record Low | Humid % | Rain (mm) | Wind (m/s) | Solar (kWh/m²) |
|---|---|---|---|---|---|---|---|---|---|---|
| January | 🌤️ | 62.3°F | 50.9°F | 39.5°F | 84.7°F | 15.4°F | 70% | 47 | 2.7 | 3.05 |
| February | 🌤️ | 67.2°F | 55.2°F | 43.2°F | 96.8°F | 11.8°F | 70% | 44 | 2.9 | 3.67 |
| March | ☀️ | 75.3°F | 62.7°F | 50.1°F | 95.2°F | 22.3°F | 68% | 56 | 3.1 | 4.60 |
| April | ☀️ | 83.5°F | 70.5°F | 57.6°F | 105.3°F | 32.9°F | 64% | 61 | 3.1 | 5.40 |
| May | ☔ | 89.0°F | 77.6°F | 66.1°F | 108.9°F | 42.8°F | 68% | 104 | 3.1 | 5.78 |
| June | ☔ | 93.7°F | 82.8°F | 72.0°F | 110.5°F | 57.0°F | 67% | 88 | 2.9 | 6.66 |
| July | 🔥 | 95.7°F | 84.7°F | 73.8°F | 110.3°F | 61.2°F | 63% | 59 | 2.9 | 6.77 |
| August | 🔥 | 97.0°F | 85.8°F | 74.7°F | 112.1°F | 63.9°F | 60% | 57 | 2.6 | 6.42 |
| September | 🌞 | 91.0°F | 80.2°F | 69.4°F | 112.6°F | 46.4°F | 65% | 76 | 2.5 | 5.32 |
| October | ☔ | 83.0°F | 71.6°F | 60.2°F | 100.4°F | 28.6°F | 67% | 87 | 2.6 | 4.34 |
| November | ☀️ | 72.1°F | 61.0°F | 49.8°F | 92.5°F | 24.8°F | 70% | 54 | 2.7 | 3.24 |
| December | 🌤️ | 64.2°F | 53.2°F | 42.1°F | 88.5°F | 9.0°F | 71% | 48 | 2.6 | 2.74 |
Showing average climate conditions across 45 years (1981–2025)
🧥 Light layers are sufficient — this Mild Winter stays cool without prolonged hard freezes.
🌤️ Limit midday outdoor exposure and stay hydrated — this is an intense Hot Summer.
☔ Moderate Rainfall expected — carry rain gear and plan outdoor activities around these months.
Monthly averages · 1981–2025 climate normals · °F
Temperatures rise steadily from spring, peak in August, and gradually decline through autumn into winter.
These seasonal patterns offer comfortable conditions year-round, with warm summers and mild winters.
Monthly rainfall · 1981–2025 seasonal trends · mm/month
Rainfall is concentrated in the spring and early summer months. Humidity stays moderate (around 67%), peaking during winter months, which creates cold and damp conditions.
☔ Moderate Rainfall expected — carry rain gear and plan outdoor activities around these months.
Monthly averages · 1981–2025
Across 45 years of records, San Antonio's temperature shows a slight warming trend over the past decade. Its hottest day reached 112.6°F in September 2000, and its coldest dropped to 9.0°F in December 1989. 2024 was the warmest year overall and 1987 the coolest.
The warmest year in San Antonio's recorded history was 2024 (avg: 73.9°F), while the coldest was 1987 (avg: 67.1°F).
Average annual high/low · Last 30 years · °F
Total annual precipitation · Last 30 years · mm/year
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall (mm) | Avg Humidity | Avg Wind |
|---|---|---|---|---|---|---|---|---|
2025 | 85.6°F | 73.2°F | 60.8°F | 105.4°F | 20.8°F | 546 | 61% | 2.7 m/s |
2024 🔥 | 85.8°F | 73.9°F | 61.9°F | 111.0°F | 19.8°F | 578 | 63% | 2.7 m/s |
2023 | 85.1°F | 73.0°F | 61.0°F | 110.5°F | 30.4°F | 551 | 63% | 2.7 m/s |
2022 | 84.4°F | 71.8°F | 59.0°F | 108.3°F | 16.2°F | 367 | 59% | 2.9 m/s |
2021 | 81.3°F | 70.2°F | 59.0°F | 102.2°F | 11.8°F | 812 | 70% | 2.7 m/s |
2020 | 83.5°F | 71.4°F | 59.4°F | 109.6°F | 27.7°F | 637 | 65% | 2.8 m/s |
2019 | 82.2°F | 70.7°F | 59.2°F | 107.2°F | 25.0°F | 524 | 66% | 2.8 m/s |
2018 | 81.0°F | 69.8°F | 58.6°F | 110.3°F | 21.2°F | 820 | 68% | 2.8 m/s |
2017 | 82.8°F | 71.2°F | 59.9°F | 106.7°F | 20.1°F | 779 | 67% | 2.8 m/s |
2016 | 80.6°F | 70.2°F | 59.5°F | 104.0°F | 23.2°F | 1053 | 72% | 2.6 m/s |
Showing 1 to 10 of 45 years
Based on 45 years of data (1981–2025), August is typically the hottest month in San Antonio, Texas, with average high temperatures around 97.0°F.
January is the coldest month in San Antonio, with average low temperatures around 39.5°F.
May receives the most rainfall with approximately 104 mm, while February is the driest with 44 mm.
The highest recorded temperature was 112.6°F in September 2000. This is part of the historical record spanning 1981–2025.
The lowest recorded temperature was 9.0°F in December 1989.
This page covers 45 years of climate data from 1981 to 2025. As new data is added to the database the page automatically reflects the updated coverage.
San Antonio receives the most sunlight in July with an average solar radiation of 6.77 kWh/m²/day. This solar radiation data, sourced from NASA POWER, is useful for solar energy planning and agriculture in Texas.
All climate data is sourced from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite and model data. It provides monthly averages for temperature, precipitation, humidity, wind speed, and solar radiation.
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources), a NASA project providing solar and meteorological data for renewable energy, building efficiency, and agricultural research.
