September is one of the warmer months of the year in San Angelo, with average highs near 31.6°C and lows around 18.5°C (mean 25.1°C). It is a relatively wet time of year, averaging 66 mm of rainfall and 59% relative humidity across the period.
September is one of the warmer months of the year in San Angelo. Across 45 years of records, the warmest Septembers in San Angelo were 2019 and 2023 — when the month averaged 28.3°C — while the coldest was 1991 at 22°C. Typical September days reach 31.6°C with nights near 18.5°C. The long-term trend is warming, about 0.3°C per decade.
September is a relatively wet time of year in San Angelo, averaging 66 mm of rainfall. The wettest September on record was 2020 with 164 mm, while the driest was 2005 at 10 mm.
Relative humidity in San Angelo during September averages 59%. The most humid September was 2018 at 76%, and the least humid was 2011 at 35%.
September receives about 5.4 kWh/m²/day of solar energy in San Angelo. The sunniest September was 2021 at 6.1 kWh/m²/day, and the cloudiest was 2018 at 4.6.
Average wind speed in San Angelo during September is 3 m/s. The windiest Septembers were 1983 and 1986 at 3.6 m/s, while the calmest was 1990 at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 24.6°C | 24.8°C | 24.8°C | 25.6°C | 25.8°C | +1.2°C |
| Avg High | 31.2°C | 31.4°C | 31.4°C | 31.8°C | 32.5°C | +1.3°C |
| Avg Low | 18.0°C | 18.3°C | 18.2°C | 19.3°C | 19.0°C | +1°C |
| Avg Rain | 62 mm | 62 mm | 46 mm | 85 mm | 81 mm | +19 mm |
September temperatures in San Angelo have risen by about 1.4°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 4.1°C (1985) to a record high of 42.9°C (2000).
Rainfall in September is a relatively wet time of year, averaging 66 mm, with a wettest year of 164 mm.
One of the best times to visit San Angelo
September is one of the best times to visit San Angelo. Expect days averaging 31.6°C and nights around 18.5°C (mean 25.1°C) — warmer than San Angelo's yearly average — with moderate rainfall (66 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 32.9°C | 26.0°C | 19.1°C | 38.2°C | 14.6°C | 31 mm | 55% | 2.7 m/s | 5.6 |
| 2024 | 30.9°C | 24.6°C | 18.2°C | 36.3°C | 12.8°C | 148 mm | 66% | 2.4 m/s | 5.4 |
| 2023 | 35.1°C | 28.3°C | 21.5°C | 41.2°C | 18.4°C | 90 mm | 55% | 2.9 m/s | 5.7 |
| 2022 | 33.3°C | 26.4°C | 19.5°C | 35.6°C | 15.2°C | 32 mm | 56% | 2.5 m/s | 6 |
| 2021 | 33.6°C | 26.5°C | 19.3°C | 38.6°C | 12.6°C | 23 mm | 52% | 2.7 m/s | 6.1 |
| 2020 🌧️ | 29.0°C | 22.8°C | 16.5°C | 37.6°C | 7.8°C | 164 mm | 67% | 2.9 m/s | 5.2 |
| 2019 🔥 | 34.7°C | 28.3°C | 22.0°C | 37.6°C | 19.8°C | 25 mm | 54% | 3.3 m/s | 5.6 |
| 2018 | 28.7°C | 23.6°C | 18.6°C | 36.8°C | 10.5°C | 152 mm | 76% | 2.8 m/s | 4.6 |
| 2017 | 31.8°C | 25.2°C | 18.7°C | 38.9°C | 13.5°C | 86 mm | 58% | 3.1 m/s | 5.2 |
| 2016 | 29.9°C | 24.5°C | 19.0°C | 35.8°C | 11.5°C | 150 mm | 71% | 2.9 m/s | 5.3 |
| 2015 | 33.6°C | 27.0°C | 20.5°C | 37.3°C | 17.0°C | 21 mm | 53% | 3 m/s | 5.8 |
| 2014 | 30.0°C | 24.4°C | 18.9°C | 38.7°C | 10.9°C | 71 mm | 69% | 2.8 m/s | 4.8 |
| 2013 | 31.3°C | 25.2°C | 19.0°C | 37.4°C | 12.0°C | 101 mm | 61% | 2.8 m/s | 5.3 |
| 2012 | 31.4°C | 24.7°C | 18.0°C | 39.8°C | 12.7°C | 154 mm | 55% | 3.2 m/s | 5.4 |
| 2011 | 34.7°C | 27.0°C | 19.2°C | 39.3°C | 13.8°C | 12 mm | 35% | 2.9 m/s | 5.9 |
| 2010 | 31.7°C | 25.6°C | 19.4°C | 36.9°C | 9.8°C | 82 mm | 65% | 3.1 m/s | 5.4 |
| 2009 | 29.2°C | 23.4°C | 17.6°C | 35.1°C | 10.2°C | 72 mm | 65% | 3.1 m/s | 5 |
| 2008 | 29.9°C | 23.4°C | 17.0°C | 34.4°C | 11.9°C | 64 mm | 60% | 2.4 m/s | 5.5 |
| 2007 | 30.8°C | 25.1°C | 19.5°C | 34.1°C | 14.3°C | 45 mm | 70% | 2.9 m/s | 5.2 |
| 2006 | 30.0°C | 23.4°C | 16.8°C | 36.5°C | 12.1°C | 55 mm | 59% | 3 m/s | 5.3 |
| 2005 | 34.4°C | 27.3°C | 20.1°C | 40.6°C | 15.3°C | 10 mm | 54% | 3 m/s | 5.9 |
| 2004 | 30.1°C | 24.1°C | 18.0°C | 36.0°C | 11.6°C | 51 mm | 63% | 2.8 m/s | 5.3 |
| 2003 | 30.2°C | 23.7°C | 17.3°C | 33.6°C | 13.5°C | 63 mm | 66% | 3 m/s | 5.1 |
| 2002 | 32.6°C | 25.5°C | 18.4°C | 37.0°C | 12.3°C | 44 mm | 53% | 3 m/s | 5.6 |
| 2001 | 31.4°C | 24.6°C | 17.7°C | 38.2°C | 8.7°C | 48 mm | 60% | 2.9 m/s | 5.8 |
| 2000 | 35.4°C | 27.4°C | 19.4°C | 42.9°C | 7.6°C | 11 mm | 38% | 3.2 m/s | 5.9 |
| 1999 | 33.6°C | 26.2°C | 18.9°C | 37.3°C | 10.0°C | 17 mm | 45% | 3.4 m/s | 5.9 |
| 1998 | 34.6°C | 27.7°C | 20.8°C | 37.9°C | 18.4°C | 10 mm | 54% | 3 m/s | 5.8 |
| 1997 | 33.7°C | 26.9°C | 20.1°C | 38.8°C | 12.9°C | 29 mm | 52% | 3 m/s | 5.8 |
| 1996 | 29.7°C | 23.4°C | 17.2°C | 32.5°C | 6.4°C | 90 mm | 68% | 2.5 m/s | 5.3 |
| 1995 | 31.7°C | 25.1°C | 18.4°C | 39.1°C | 6.2°C | 62 mm | 61% | 3 m/s | 5 |
| 1994 | 31.0°C | 24.1°C | 17.2°C | 36.0°C | 9.9°C | 43 mm | 57% | 2.8 m/s | 5.4 |
| 1993 | 30.1°C | 23.5°C | 16.9°C | 33.9°C | 8.4°C | 54 mm | 61% | 2.8 m/s | 5.3 |
| 1992 | 32.7°C | 25.5°C | 18.3°C | 37.3°C | 11.1°C | 15 mm | 54% | 3.4 m/s | 5.8 |
| 1991 ❄️ | 27.5°C | 22.0°C | 16.4°C | 33.7°C | 7.8°C | 151 mm | 72% | 2.7 m/s | 4.7 |
| 1990 | 29.4°C | 24.1°C | 18.7°C | 37.5°C | 12.8°C | 147 mm | 68% | 2.3 m/s | 4.7 |
| 1989 | 30.8°C | 23.5°C | 16.1°C | 38.7°C | 4.6°C | 54 mm | 51% | 2.9 m/s | 5.6 |
| 1988 | 31.3°C | 24.5°C | 17.8°C | 37.0°C | 10.3°C | 109 mm | 58% | 2.9 m/s | 5.4 |
| 1987 | 30.1°C | 23.5°C | 16.9°C | 35.4°C | 12.4°C | 80 mm | 64% | 2.6 m/s | 5.6 |
| 1986 | 30.2°C | 24.9°C | 19.5°C | 33.4°C | 14.2°C | 83 mm | 71% | 3.6 m/s | 4.8 |
| 1985 | 30.3°C | 24.2°C | 18.1°C | 38.2°C | 4.1°C | 92 mm | 59% | 3.5 m/s | 5.3 |
| 1984 | 30.3°C | 23.4°C | 16.4°C | 37.4°C | 4.2°C | 73 mm | 53% | 3.4 m/s | 5.3 |
| 1983 | 33.0°C | 26.1°C | 19.2°C | 37.4°C | 9.4°C | 12 mm | 51% | 3.6 m/s | — |
| 1982 | 33.2°C | 26.3°C | 19.3°C | 37.2°C | 12.2°C | 21 mm | 49% | 3.1 m/s | — |
| 1981 | 31.8°C | 25.1°C | 18.3°C | 36.3°C | 10.8°C | 37 mm | 58% | 3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 31.6°C with lows near 18.5°C (mean 25.1°C), based on 45 years of NASA POWER data.
September averages 66 mm of rainfall in San Angelo, a relatively wet time of year. The wettest on record was 164 mm in 2020.
The hottest September reached 42.9°C in 2000. The coldest dipped to 4.1°C in 1985.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.4°C. Daytime highs moved from 31.7°C to 33.2°C and overnight lows from 18.3°C to 19.5°C over the same span.
September is one of the warmer months of the year in San Angelo and a relatively wet time of year, so plan for around 31.6°C daytime highs and 18.5°C at night.
Not quite — September is the 9th coolest month in San Angelo, averaging 25.1°C.
For September in San Angelo, pack light, breathable clothing and sun protection, with typical highs of 31.6°C and lows of 18.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 59% — moderately humid.
Average wind speed in September is 3 m/s. The windiest September on record averaged 3.6 m/s (1983).
The wettest September on record was 2020 with 164 mm. On average, September sees 66 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in San Angelo behaves each September, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for September specifically, along with year-by-year records and how the month has changed over the decades.
