September is one of the warmer months of the year in Brooks, with average highs near 20.9°C and lows around 7.5°C (mean 14.2°C). It is about average for rainfall, averaging 33 mm of rainfall and 56% relative humidity across the period.
September is one of the warmer months of the year in Brooks. Across 45 years of records, the warmest September in Brooks was 2025 — when the month averaged 18.9°C — while the coldest was 1985 at 8.4°C. Typical September days reach 20.9°C with nights near 7.5°C. The long-term trend is warming, about 0.8°C per decade.
September is about average for rainfall in Brooks, averaging 33 mm of rainfall. The wettest September on record was 1986 with 137 mm, while the driest were 1990 and 2012 at 3 mm.
Relative humidity in Brooks during September averages 56%. The most humid September was 1986 at 71%, and the least humid was 2009 at 43%.
September receives about 4 kWh/m²/day of solar energy in Brooks. The sunniest September was 1990 at 4.9 kWh/m²/day, and the cloudiest was 1986 at 3.
Average wind speed in Brooks during September is 2.7 m/s. The windiest Septembers were 1985, 2009 and 2011 at 3.1 m/s, while the calmest was 2008 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.2°C | 14.3°C | 14.2°C | 14.2°C | 17.1°C | +4.9°C |
| Avg High | 18.6°C | 21.4°C | 21.0°C | 20.7°C | 23.8°C | +5.2°C |
| Avg Low | 5.8°C | 7.3°C | 7.5°C | 7.7°C | 10.3°C | +4.5°C |
| Avg Rain | 53 mm | 24 mm | 33 mm | 29 mm | 24 mm | -29 mm |
September temperatures in Brooks have risen by about 5.9°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -6.6°C (2019) to a record high of 35.7°C (1998).
Rainfall in September is about average for rainfall, averaging 33 mm, with a wettest year of 137 mm.
One of the best times to visit Brooks
September is one of the best times to visit Brooks. Expect days averaging 20.9°C and nights around 7.5°C (mean 14.2°C) — warmer than Brooks's yearly average — with moderate rainfall (33 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 🔥 | 26.0°C | 18.9°C | 11.7°C | 31.1°C | 6.4°C | 6 mm | 54% | 2.4 m/s | 4.4 |
| 2024 | 24.0°C | 17.5°C | 11.1°C | 33.6°C | 3.9°C | 63 mm | 58% | 2.8 m/s | 3.8 |
| 2023 | 22.9°C | 16.6°C | 10.2°C | 31.4°C | 5.1°C | 25 mm | 55% | 2.7 m/s | 4 |
| 2022 | 25.0°C | 17.9°C | 10.9°C | 35.2°C | 3.0°C | 11 mm | 50% | 2.5 m/s | 4.1 |
| 2021 | 23.3°C | 16.4°C | 9.5°C | 30.3°C | 3.4°C | 13 mm | 49% | 3 m/s | 4.2 |
| 2020 | 21.8°C | 15.1°C | 8.4°C | 32.5°C | 2.4°C | 26 mm | 58% | 2.9 m/s | 3.8 |
| 2019 | 19.1°C | 13.5°C | 7.8°C | 28.2°C | -6.6°C | 61 mm | 64% | 2.9 m/s | 3.6 |
| 2018 | 15.7°C | 10.2°C | 4.6°C | 29.5°C | -3.5°C | 20 mm | 64% | 2.4 m/s | 3.4 |
| 2017 | 21.6°C | 14.8°C | 8.0°C | 33.4°C | 1.4°C | 10 mm | 51% | 2.6 m/s | 4.1 |
| 2016 | 20.1°C | 13.9°C | 7.7°C | 28.8°C | 1.6°C | 30 mm | 58% | 2.8 m/s | 3.9 |
| 2015 | 19.9°C | 13.4°C | 7.0°C | 29.8°C | 2.2°C | 50 mm | 60% | 2.6 m/s | 3.8 |
| 2014 | 20.5°C | 13.9°C | 7.2°C | 29.8°C | -2.7°C | 33 mm | 61% | 2.7 m/s | 3.9 |
| 2013 | 23.6°C | 16.8°C | 10.1°C | 32.5°C | 1.1°C | 25 mm | 53% | 3 m/s | 4.2 |
| 2012 | 24.0°C | 16.6°C | 9.1°C | 29.8°C | 5.7°C | 3 mm | 48% | 2.8 m/s | 4.3 |
| 2011 | 24.5°C | 16.9°C | 9.3°C | 32.5°C | 3.5°C | 16 mm | 46% | 3.1 m/s | 4.6 |
| 2010 | 17.8°C | 11.9°C | 6.0°C | 26.7°C | -1.1°C | 41 mm | 66% | 2.7 m/s | 3.3 |
| 2009 | 25.8°C | 17.9°C | 10.1°C | 35.2°C | 3.0°C | 4 mm | 43% | 3.1 m/s | 4.6 |
| 2008 | 20.3°C | 13.5°C | 6.8°C | 28.3°C | 3.1°C | 34 mm | 60% | 2.2 m/s | 4.1 |
| 2007 | 19.6°C | 13.1°C | 6.7°C | 28.5°C | -0.2°C | 37 mm | 58% | 2.7 m/s | 3.8 |
| 2006 | 21.5°C | 14.6°C | 7.7°C | 31.6°C | 0.5°C | 25 mm | 57% | 2.9 m/s | 3.9 |
| 2005 | 18.9°C | 12.7°C | 6.5°C | 28.3°C | -0.2°C | 82 mm | 64% | 2.6 m/s | 4 |
| 2004 | 19.6°C | 13.3°C | 6.9°C | 28.0°C | -0.6°C | 19 mm | 63% | 2.6 m/s | 3.9 |
| 2003 | 20.3°C | 13.7°C | 7.0°C | 34.2°C | -2.6°C | 29 mm | 54% | 2.8 m/s | 3.6 |
| 2002 | 19.1°C | 13.1°C | 7.0°C | 28.5°C | 0.1°C | 62 mm | 60% | 2.8 m/s | 3.7 |
| 2001 | 24.2°C | 16.6°C | 9.1°C | 32.8°C | 4.6°C | 9 mm | 44% | 2.8 m/s | 4.2 |
| 2000 | 20.4°C | 13.6°C | 6.8°C | 30.5°C | -4.7°C | 28 mm | 54% | 2.7 m/s | 3.7 |
| 1999 | 20.2°C | 13.4°C | 6.6°C | 30.6°C | -1.0°C | 7 mm | 50% | 2.8 m/s | 4.3 |
| 1998 | 23.1°C | 16.1°C | 9.0°C | 35.7°C | 1.4°C | 22 mm | 51% | 2.5 m/s | 4.2 |
| 1997 | 23.5°C | 16.2°C | 8.9°C | 32.1°C | 0.2°C | 13 mm | 50% | 2.9 m/s | 4.3 |
| 1996 | 17.6°C | 11.9°C | 6.3°C | 30.6°C | -0.6°C | 70 mm | 62% | 2.8 m/s | 3.3 |
| 1995 | 21.4°C | 14.4°C | 7.4°C | 30.7°C | -3.3°C | 11 mm | 50% | 2.4 m/s | 4.3 |
| 1994 | 24.4°C | 16.6°C | 8.9°C | 30.8°C | 2.8°C | 10 mm | 46% | 2.6 m/s | 4.3 |
| 1993 | 18.2°C | 11.6°C | 5.0°C | 27.5°C | -0.7°C | 54 mm | 63% | 2.6 m/s | 4.3 |
| 1992 | 18.5°C | 11.6°C | 4.7°C | 29.5°C | -1.5°C | 31 mm | 59% | 3 m/s | 3.8 |
| 1991 | 21.7°C | 14.6°C | 7.5°C | 29.4°C | -1.1°C | 17 mm | 52% | 2.6 m/s | 4.3 |
| 1990 | 25.0°C | 17.0°C | 9.0°C | 32.5°C | 2.5°C | 3 mm | 45% | 2.7 m/s | 4.9 |
| 1989 | 20.0°C | 13.3°C | 6.6°C | 26.8°C | -0.9°C | 33 mm | 59% | 2.8 m/s | 4.3 |
| 1988 | 20.8°C | 13.9°C | 7.0°C | 32.4°C | 0.4°C | 37 mm | 54% | 2.9 m/s | 3.6 |
| 1987 | 23.0°C | 15.8°C | 8.6°C | 31.4°C | 5.0°C | 20 mm | 53% | 2.5 m/s | 4.3 |
| 1986 🌧️ | 14.7°C | 9.4°C | 4.0°C | 26.2°C | -0.7°C | 137 mm | 71% | 2.5 m/s | 3 |
| 1985 ❄️ | 14.3°C | 8.4°C | 2.6°C | 22.3°C | -5.7°C | 72 mm | 66% | 3.1 m/s | 3.3 |
| 1984 | 16.0°C | 9.9°C | 3.8°C | 31.1°C | -4.4°C | 74 mm | 61% | 2.8 m/s | 3.7 |
| 1983 | 18.0°C | 11.6°C | 5.2°C | 31.1°C | -3.5°C | 21 mm | 57% | 3 m/s | — |
| 1982 | 19.2°C | 12.9°C | 6.6°C | 29.9°C | -0.3°C | 66 mm | 61% | 3 m/s | — |
| 1981 | 21.8°C | 15.0°C | 8.2°C | 33.1°C | -0.5°C | 17 mm | 52% | 2.7 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 20.9°C with lows near 7.5°C (mean 14.2°C), based on 45 years of NASA POWER data.
September averages 33 mm of rainfall in Brooks, about average for rainfall. The wettest on record was 137 mm in 1986.
The hottest September reached 35.7°C in 1998. The coldest dipped to -6.6°C in 2019.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 5.9°C. Daytime highs moved from 17.9°C to 24.2°C and overnight lows from 5.3°C to 10.7°C over the same span.
September is one of the warmer months of the year in Brooks and about average for rainfall, so plan for around 20.9°C daytime highs and 7.5°C at night.
Not quite — September is the 9th coolest month in Brooks, averaging 14.2°C.
For September in Brooks, pack warm layers and a jacket for chilly mornings, with typical highs of 20.9°C and lows of 7.5°C.
Relative humidity in September averages 56% — moderately humid.
Average wind speed in September is 2.7 m/s. The windiest September on record averaged 3.1 m/s (1985).
The wettest September on record was 1986 with 137 mm. On average, September sees 33 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 Brooks 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.
