September is one of the warmer months of the year in Eagle Pass, with average highs near 34°C and lows around 21.6°C (mean 27.8°C). It is a relatively wet time of year, averaging 68 mm of rainfall and 60% relative humidity across the period.
September is one of the warmer months of the year in Eagle Pass. Across 45 years of records, the warmest September in Eagle Pass was 2023 — when the month averaged 32.1°C — while the coldest was 1991 at 25°C. Typical September days reach 34°C with nights near 21.6°C. The long-term trend is warming, about 0.3°C per decade.
September is a relatively wet time of year in Eagle Pass, averaging 68 mm of rainfall. The wettest September on record was 2018 with 244 mm, while the driest was 2005 at 7 mm.
Relative humidity in Eagle Pass during September averages 60%. The most humid September was 2018 at 80%, and the least humid was 2011 at 42%.
September receives about 5.5 kWh/m²/day of solar energy in Eagle Pass. The sunniest September was 2023 at 6.3 kWh/m²/day, and the cloudiest was 2018 at 4.6.
Average wind speed in Eagle Pass during September is 2.7 m/s. The windiest Septembers were 1985 and 1986 at 3.5 m/s, while the calmest was 2008 at 1.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 27.7°C | 27.1°C | 27.5°C | 28.3°C | 28.8°C | +1.1°C |
| Avg High | 34.2°C | 33.3°C | 33.6°C | 34.2°C | 35.2°C | +1°C |
| Avg Low | 21.2°C | 21.0°C | 21.3°C | 22.5°C | 22.4°C | +1.2°C |
| Avg Rain | 52 mm | 74 mm | 57 mm | 99 mm | 51 mm | -1 mm |
September temperatures in Eagle Pass have risen by about 1.4°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 9.4°C (1984) to a record high of 44.5°C (2000).
Rainfall in September is a relatively wet time of year, averaging 68 mm, with a wettest year of 244 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
A good time to visit Eagle Pass
September is a good time to visit Eagle Pass, with days averaging 34°C and nights around 21.6°C (mean 27.8°C, warmer than Eagle Pass's yearly average) and moderate rainfall. October and April are marginally more temperate, but September still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 35.3°C | 29.1°C | 22.8°C | 39.9°C | 19.4°C | 49 mm | 56% | 2.2 m/s | 5.5 |
| 2024 | 34.8°C | 28.4°C | 22.0°C | 37.7°C | 14.9°C | 77 mm | 61% | 2.2 m/s | 5.5 |
| 2023 🔥 | 39.1°C | 32.1°C | 25.1°C | 42.4°C | 23.2°C | 11 mm | 47% | 2.5 m/s | 6.3 |
| 2022 | 32.8°C | 27.0°C | 21.3°C | 34.9°C | 16.4°C | 54 mm | 69% | 1.9 m/s | 6 |
| 2021 | 36.8°C | 30.0°C | 23.1°C | 40.5°C | 15.5°C | 21 mm | 46% | 2.5 m/s | 6.1 |
| 2020 | 32.1°C | 26.0°C | 20.0°C | 40.3°C | 11.6°C | 92 mm | 65% | 2.4 m/s | 5 |
| 2019 | 37.0°C | 31.1°C | 25.2°C | 41.0°C | 23.2°C | 10 mm | 50% | 3.2 m/s | 5.5 |
| 2018 🌧️ | 29.8°C | 25.8°C | 21.8°C | 36.6°C | 17.5°C | 244 mm | 80% | 2.4 m/s | 4.6 |
| 2017 | 34.7°C | 28.7°C | 22.7°C | 41.9°C | 19.3°C | 176 mm | 54% | 2.9 m/s | 5.1 |
| 2016 | 32.5°C | 27.1°C | 21.8°C | 36.2°C | 16.4°C | 144 mm | 72% | 2.4 m/s | 5.6 |
| 2015 | 36.6°C | 30.2°C | 23.9°C | 40.0°C | 20.4°C | 8 mm | 50% | 2.9 m/s | 5.8 |
| 2014 | 32.5°C | 27.2°C | 21.9°C | 40.1°C | 17.5°C | 111 mm | 68% | 2.6 m/s | 5 |
| 2013 | 33.3°C | 27.7°C | 22.0°C | 38.4°C | 14.1°C | 89 mm | 64% | 2.7 m/s | 5.2 |
| 2012 | 34.6°C | 27.9°C | 21.3°C | 41.2°C | 15.9°C | 90 mm | 54% | 3.1 m/s | 5.8 |
| 2011 | 37.0°C | 29.6°C | 22.2°C | 41.1°C | 16.7°C | 38 mm | 42% | 2.3 m/s | 6.1 |
| 2010 | 33.6°C | 27.8°C | 22.0°C | 37.0°C | 15.0°C | 78 mm | 66% | 2.9 m/s | 5.3 |
| 2009 | 31.9°C | 26.5°C | 21.0°C | 37.0°C | 16.2°C | 105 mm | 67% | 2.5 m/s | 4.9 |
| 2008 | 31.5°C | 25.7°C | 20.0°C | 36.2°C | 15.1°C | 19 mm | 66% | 1.8 m/s | 5.3 |
| 2007 | 32.4°C | 27.0°C | 21.6°C | 35.0°C | 18.9°C | 76 mm | 72% | 2.7 m/s | 5.5 |
| 2006 | 33.9°C | 27.5°C | 21.2°C | 39.2°C | 15.9°C | 59 mm | 59% | 2.7 m/s | 5.3 |
| 2005 | 37.8°C | 31.1°C | 24.5°C | 43.1°C | 22.1°C | 7 mm | 48% | 3 m/s | 6 |
| 2004 | 32.8°C | 26.9°C | 21.0°C | 36.3°C | 14.3°C | 59 mm | 66% | 2.6 m/s | 5.2 |
| 2003 | 31.4°C | 26.1°C | 20.7°C | 35.7°C | 16.2°C | 99 mm | 72% | 2.4 m/s | 4.8 |
| 2002 | 34.3°C | 27.6°C | 20.9°C | 38.1°C | 15.1°C | 44 mm | 57% | 2.8 m/s | 5.4 |
| 2001 | 34.2°C | 27.4°C | 20.6°C | 39.3°C | 12.8°C | 62 mm | 61% | 2.7 m/s | 5.8 |
| 2000 | 36.1°C | 28.7°C | 21.3°C | 44.5°C | 9.5°C | 43 mm | 47% | 2.5 m/s | 6.1 |
| 1999 | 34.5°C | 27.5°C | 20.6°C | 38.6°C | 13.5°C | 8 mm | 57% | 2.6 m/s | 6 |
| 1998 | 33.3°C | 27.8°C | 22.2°C | 37.5°C | 19.7°C | 47 mm | 70% | 2.3 m/s | 5.4 |
| 1997 | 35.9°C | 29.3°C | 22.7°C | 40.1°C | 16.5°C | 47 mm | 53% | 2.6 m/s | 5.8 |
| 1996 | 32.3°C | 26.5°C | 20.7°C | 35.9°C | 12.3°C | 85 mm | 70% | 2.1 m/s | 5.5 |
| 1995 | 33.5°C | 27.3°C | 21.1°C | 38.9°C | 10.4°C | 98 mm | 64% | 2.6 m/s | 5.5 |
| 1994 | 33.4°C | 26.6°C | 19.8°C | 39.7°C | 12.0°C | 53 mm | 56% | 2.7 m/s | 5.6 |
| 1993 | 32.8°C | 26.6°C | 20.4°C | 36.1°C | 14.7°C | 70 mm | 63% | 2.3 m/s | 5.4 |
| 1992 | 35.7°C | 28.6°C | 21.6°C | 40.1°C | 13.8°C | 22 mm | 53% | 3 m/s | 5.7 |
| 1991 ❄️ | 30.1°C | 25.0°C | 19.8°C | 36.0°C | 12.2°C | 185 mm | 72% | 2.6 m/s | 4.8 |
| 1990 | 31.2°C | 26.2°C | 21.1°C | 37.9°C | 14.4°C | 124 mm | 70% | 2.2 m/s | 4.9 |
| 1989 | 34.1°C | 26.9°C | 19.6°C | 39.6°C | 10.2°C | 29 mm | 48% | 2.7 m/s | 6 |
| 1988 | 34.5°C | 28.0°C | 21.5°C | 38.7°C | 16.0°C | 95 mm | 57% | 3 m/s | 5.2 |
| 1987 | 33.8°C | 27.0°C | 20.3°C | 38.7°C | 13.9°C | 44 mm | 60% | 2.4 m/s | 5.5 |
| 1986 | 33.4°C | 27.9°C | 22.4°C | 36.8°C | 20.1°C | 75 mm | 67% | 3.5 m/s | 4.9 |
| 1985 | 34.5°C | 28.2°C | 22.0°C | 40.1°C | 10.8°C | 74 mm | 54% | 3.5 m/s | 5.6 |
| 1984 | 33.5°C | 27.0°C | 20.4°C | 38.2°C | 9.4°C | 50 mm | 52% | 3.2 m/s | 5.4 |
| 1983 | 33.8°C | 27.6°C | 21.5°C | 41.1°C | 12.1°C | 50 mm | 58% | 3.4 m/s | — |
| 1982 | 35.5°C | 28.7°C | 21.8°C | 39.0°C | 15.1°C | 30 mm | 50% | 3 m/s | — |
| 1981 | 34.3°C | 27.8°C | 21.4°C | 37.0°C | 13.9°C | 23 mm | 58% | 3.1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 34°C with lows near 21.6°C (mean 27.8°C), based on 45 years of NASA POWER data.
September averages 68 mm of rainfall in Eagle Pass, a relatively wet time of year. The wettest on record was 244 mm in 2018.
The hottest September reached 44.5°C in 2000. The coldest dipped to 9.4°C in 1984.
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 34.3°C to 35.8°C and overnight lows from 21.4°C to 22.9°C over the same span.
September is one of the warmer months of the year in Eagle Pass and a relatively wet time of year, so plan for around 34°C daytime highs and 21.6°C at night.
Not quite — September is the 9th coolest month in Eagle Pass, averaging 27.8°C.
For September in Eagle Pass, pack light, breathable clothing and sun protection, with typical highs of 34°C and lows of 21.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 60% — moderately humid.
Average wind speed in September is 2.7 m/s. The windiest September on record averaged 3.5 m/s (1985).
The wettest September on record was 2018 with 244 mm. On average, September sees 68 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 Eagle Pass 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.
