September is one of the cooler months of the year in Theodore, with average highs near 28.2°C and lows around 11.7°C (mean 20°C). It is one of the drier months, averaging 28 mm of rainfall and 54% relative humidity across the period.
September is one of the cooler months of the year in Theodore. Across 45 years of records, the warmest September in Theodore was 2013 — when the month averaged 23.3°C — while the coldest was 1984 at 16.7°C. Typical September days reach 28.2°C with nights near 11.7°C. The long-term trend is warming, about 0.4°C per decade.
September is one of the drier months in Theodore, averaging 28 mm of rainfall. The wettest September on record was 2010 with 173 mm, while the driest were 2000 and 2017 at 0 mm.
Relative humidity in Theodore during September averages 54%. The most humid September was 2010 at 78%, and the least humid was 2019 at 36%.
September receives about 5.9 kWh/m²/day of solar energy in Theodore. The sunniest Septembers were 1991 and 2003 at 6.6 kWh/m²/day, and the cloudiest was 2010 at 4.5.
Average wind speed in Theodore during September is 2.5 m/s. The windiest Septembers were 1996 and 2021 at 2.8 m/s, while the calmest was 2012 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.2°C | 19.6°C | 20.4°C | 20.0°C | 20.8°C | +1.6°C |
| Avg High | 27.3°C | 27.8°C | 28.8°C | 28.1°C | 29.1°C | +1.8°C |
| Avg Low | 10.9°C | 11.5°C | 12.0°C | 12.0°C | 12.6°C | +1.7°C |
| Avg Rain | 24 mm | 40 mm | 18 mm | 40 mm | 14 mm | -10 mm |
September temperatures in Theodore have risen by about 1.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 2.8°C (1995) to a record high of 40.4°C (2013).
Rainfall in September is one of the drier months, averaging 28 mm, with a wettest year of 173 mm.
One of the best times to visit Theodore
September is one of the best times to visit Theodore. Expect days averaging 28.2°C and nights around 11.7°C (mean 20°C) — cooler than Theodore's yearly average — with low rainfall (28 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 | 29.4°C | 21.2°C | 13.0°C | 35.3°C | 8.4°C | 9 mm | 52% | 2.3 m/s | 6.1 |
| 2024 | 29.7°C | 21.1°C | 12.5°C | 33.1°C | 8.2°C | 14 mm | 53% | 2.3 m/s | 6.1 |
| 2023 | 30.5°C | 21.8°C | 13.1°C | 35.5°C | 8.6°C | 1 mm | 48% | 2.4 m/s | 6.2 |
| 2022 | 26.8°C | 19.5°C | 12.3°C | 32.9°C | 9.4°C | 36 mm | 62% | 2.4 m/s | 4.9 |
| 2021 | 28.7°C | 20.1°C | 11.5°C | 32.7°C | 6.6°C | 14 mm | 49% | 2.8 m/s | 6 |
| 2020 | 29.2°C | 21.3°C | 13.3°C | 34.0°C | 8.0°C | 12 mm | 55% | 2.6 m/s | 5.5 |
| 2019 | 30.2°C | 21.2°C | 12.1°C | 34.2°C | 6.9°C | 2 mm | 36% | 2.4 m/s | 6.4 |
| 2018 | 28.4°C | 20.4°C | 12.3°C | 31.5°C | 7.9°C | 24 mm | 54% | 2.5 m/s | 6.1 |
| 2017 | 31.2°C | 22.0°C | 12.8°C | 38.9°C | 7.4°C | 0 mm | 42% | 2.6 m/s | 6.5 |
| 2016 | 26.7°C | 19.6°C | 12.4°C | 29.6°C | 8.0°C | 66 mm | 65% | 2.7 m/s | 5.1 |
| 2015 | 26.2°C | 18.4°C | 10.6°C | 30.1°C | 5.2°C | 23 mm | 59% | 2.3 m/s | 6 |
| 2014 | 26.8°C | 18.8°C | 10.8°C | 30.7°C | 3.9°C | 71 mm | 57% | 2.4 m/s | 5.7 |
| 2013 🔥 | 32.4°C | 23.3°C | 14.3°C | 40.4°C | 9.5°C | 8 mm | 44% | 2.4 m/s | 6.3 |
| 2012 | 28.1°C | 19.9°C | 11.7°C | 34.6°C | 4.4°C | 23 mm | 55% | 2.2 m/s | 6 |
| 2011 | 26.8°C | 18.4°C | 10.1°C | 31.5°C | 3.9°C | 11 mm | 58% | 2.3 m/s | 6 |
| 2010 🌧️ | 24.2°C | 18.5°C | 12.7°C | 29.9°C | 7.8°C | 173 mm | 78% | 2.3 m/s | 4.5 |
| 2009 | 29.9°C | 21.1°C | 12.3°C | 35.5°C | 8.4°C | 23 mm | 49% | 2.4 m/s | 6.3 |
| 2008 | 27.3°C | 20.0°C | 12.7°C | 34.9°C | 7.6°C | 56 mm | 65% | 2.4 m/s | 5.8 |
| 2007 | 27.5°C | 19.6°C | 11.6°C | 33.4°C | 7.6°C | 50 mm | 61% | 2.5 m/s | 5.8 |
| 2006 | 28.1°C | 20.2°C | 12.2°C | 33.6°C | 7.1°C | 7 mm | 58% | 2.5 m/s | 5.8 |
| 2005 | 29.3°C | 21.0°C | 12.7°C | 33.8°C | 6.4°C | 8 mm | 53% | 2.4 m/s | 6.2 |
| 2004 | 27.9°C | 19.5°C | 11.1°C | 33.8°C | 3.7°C | 12 mm | 54% | 2.4 m/s | 6.2 |
| 2003 | 29.9°C | 20.8°C | 11.8°C | 36.6°C | 3.5°C | 2 mm | 49% | 2.4 m/s | 6.6 |
| 2002 | 28.9°C | 20.2°C | 11.5°C | 34.8°C | 6.7°C | 3 mm | 54% | 2.7 m/s | 6.3 |
| 2001 | 28.4°C | 20.0°C | 11.6°C | 31.7°C | 7.2°C | 19 mm | 53% | 2.4 m/s | 5.8 |
| 2000 | 30.8°C | 21.5°C | 12.2°C | 35.5°C | 7.9°C | 0 mm | 45% | 2.4 m/s | 6.4 |
| 1999 | 28.2°C | 20.2°C | 12.2°C | 31.9°C | 8.5°C | 7 mm | 56% | 2.7 m/s | 5.8 |
| 1998 | 25.2°C | 19.3°C | 13.4°C | 28.3°C | 6.7°C | 125 mm | 76% | 2.4 m/s | 5 |
| 1997 | 29.8°C | 21.7°C | 13.5°C | 36.2°C | 8.0°C | 19 mm | 51% | 2.4 m/s | 5.7 |
| 1996 | 28.8°C | 19.6°C | 10.4°C | 35.2°C | 4.3°C | 74 mm | 48% | 2.8 m/s | 6.1 |
| 1995 | 28.5°C | 20.2°C | 11.9°C | 32.0°C | 2.8°C | 19 mm | 52% | 2.6 m/s | 5.7 |
| 1994 | 28.4°C | 19.2°C | 10.1°C | 33.2°C | 4.4°C | 7 mm | 41% | 2.5 m/s | 6.4 |
| 1993 | 25.8°C | 18.4°C | 11.0°C | 34.3°C | 6.9°C | 73 mm | 62% | 2.7 m/s | 5.5 |
| 1992 | 26.8°C | 18.7°C | 10.5°C | 32.0°C | 5.9°C | 64 mm | 57% | 2.6 m/s | 5.7 |
| 1991 | 29.7°C | 20.6°C | 11.5°C | 34.1°C | 5.6°C | 1 mm | 37% | 2.5 m/s | 6.6 |
| 1990 | 26.5°C | 18.3°C | 10.1°C | 31.2°C | 5.1°C | 10 mm | 52% | 2.5 m/s | 5.8 |
| 1989 | 27.6°C | 18.7°C | 9.9°C | 34.2°C | 5.0°C | 11 mm | 53% | 2.5 m/s | 6.2 |
| 1988 | 27.1°C | 19.3°C | 11.4°C | 38.2°C | 5.8°C | 12 mm | 63% | 2.7 m/s | 5.8 |
| 1987 | 28.0°C | 19.5°C | 10.9°C | 30.5°C | 4.5°C | 9 mm | 49% | 2.3 m/s | 5.8 |
| 1986 | 28.0°C | 19.7°C | 11.4°C | 33.6°C | 2.9°C | 47 mm | 53% | 2.7 m/s | 5.9 |
| 1985 | 26.5°C | 18.2°C | 9.8°C | 33.5°C | 3.0°C | 31 mm | 54% | 2.7 m/s | 6 |
| 1984 ❄️ | 24.4°C | 16.7°C | 8.9°C | 28.0°C | 3.1°C | 72 mm | 61% | 2.3 m/s | 5.9 |
| 1983 | 28.1°C | 20.4°C | 12.7°C | 31.4°C | 7.2°C | 8 mm | 67% | 2.3 m/s | — |
| 1982 | 27.3°C | 19.3°C | 11.2°C | 35.2°C | 5.6°C | 24 mm | 52% | 2.4 m/s | — |
| 1981 | 28.9°C | 20.6°C | 12.3°C | 35.8°C | 3.6°C | 1 mm | 53% | 2.4 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 28.2°C with lows near 11.7°C (mean 20°C), based on 45 years of NASA POWER data.
September averages 28 mm of rainfall in Theodore, one of the drier months. The wettest on record was 173 mm in 2010.
The hottest September reached 40.4°C in 2013. The coldest dipped to 2.8°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.7°C. Daytime highs moved from 27°C to 29°C and overnight lows from 11°C to 12.5°C over the same span.
September is one of the cooler months of the year in Theodore and one of the drier months, so plan for around 28.2°C daytime highs and 11.7°C at night.
Not quite — September is the 5th coolest month in Theodore, averaging 20°C.
For September in Theodore, pack light layers you can adjust through the day, with typical highs of 28.2°C and lows of 11.7°C.
Relative humidity in September averages 54% — relatively dry.
Average wind speed in September is 2.5 m/s. The windiest September on record averaged 2.8 m/s (1996).
The wettest September on record was 2010 with 173 mm. On average, September sees 28 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 Theodore 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.
