September is one of the warmer months of the year in Topeka, with average highs near 27.5°C and lows around 14.6°C (mean 21.1°C). It is a relatively wet time of year, averaging 90 mm of rainfall and 67% relative humidity across the period.
September is one of the warmer months of the year in Topeka. Across 45 years of records, the warmest September in Topeka was 2023 — when the month averaged 24.2°C — while the coldest was 1993 at 16.7°C. Typical September days reach 27.5°C with nights near 14.6°C. The long-term trend is warming, about 0.5°C per decade.
September is a relatively wet time of year in Topeka, averaging 90 mm of rainfall. The wettest September on record was 1986 with 227 mm, while the driest was 1990 at 21 mm.
Relative humidity in Topeka during September averages 67%. The most humid September was 2019 at 84%, and the least humid was 2000 at 43%.
September receives about 4.7 kWh/m²/day of solar energy in Topeka. The sunniest September was 2004 at 5.5 kWh/m²/day, and the cloudiest was 1986 at 3.9.
Average wind speed in Topeka during September is 2.9 m/s. The windiest September was 1985 at 3.7 m/s, while the calmest was 2025 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.6°C | 20.4°C | 20.5°C | 21.7°C | 22.7°C | +2.1°C |
| Avg High | 26.9°C | 26.9°C | 27.0°C | 27.8°C | 29.7°C | +2.8°C |
| Avg Low | 14.2°C | 13.8°C | 14.0°C | 15.6°C | 15.7°C | +1.5°C |
| Avg Rain | 108 mm | 100 mm | 84 mm | 92 mm | 55 mm | -53 mm |
September temperatures in Topeka have risen by about 2.6°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -0.7°C (1995) to a record high of 43.8°C (2000).
Rainfall in September is a relatively wet time of year, averaging 90 mm, with a wettest year of 227 mm.
One of the best times to visit Topeka
September is one of the best times to visit Topeka. Expect days averaging 27.5°C and nights around 14.6°C (mean 21.1°C) — warmer than Topeka's yearly average — with higher rainfall (90 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 | 29.1°C | 22.7°C | 16.3°C | 35.8°C | 9.0°C | 65 mm | 69% | 2 m/s | 4.4 |
| 2024 | 30.6°C | 23.1°C | 15.5°C | 36.4°C | 10.5°C | 40 mm | 56% | 2.4 m/s | 5.1 |
| 2023 🔥 | 31.8°C | 24.2°C | 16.6°C | 37.8°C | 11.9°C | 50 mm | 55% | 2.7 m/s | 5.2 |
| 2022 | 30.5°C | 23.1°C | 15.7°C | 38.4°C | 7.9°C | 38 mm | 55% | 2.8 m/s | 5 |
| 2021 | 29.8°C | 23.2°C | 16.5°C | 34.5°C | 8.8°C | 81 mm | 65% | 3 m/s | 4.9 |
| 2020 | 26.6°C | 20.0°C | 13.3°C | 35.6°C | 6.6°C | 56 mm | 69% | 2.8 m/s | 4.4 |
| 2019 | 28.2°C | 23.4°C | 18.6°C | 31.6°C | 12.0°C | 92 mm | 84% | 3.1 m/s | 4.7 |
| 2018 | 26.8°C | 21.5°C | 16.2°C | 33.6°C | 7.3°C | 84 mm | 78% | 2.8 m/s | 4.3 |
| 2017 | 29.1°C | 22.7°C | 16.3°C | 33.5°C | 9.3°C | 59 mm | 65% | 2.8 m/s | 4.8 |
| 2016 | 26.9°C | 21.4°C | 15.9°C | 33.0°C | 8.0°C | 172 mm | 78% | 2.9 m/s | 5 |
| 2015 | 29.3°C | 23.2°C | 17.1°C | 36.7°C | 9.1°C | 79 mm | 71% | 3.1 m/s | 4.9 |
| 2014 | 26.8°C | 20.6°C | 14.5°C | 33.5°C | 5.1°C | 101 mm | 71% | 2.8 m/s | 4.6 |
| 2013 | 29.8°C | 22.9°C | 15.9°C | 39.5°C | 9.6°C | 77 mm | 63% | 2.9 m/s | 5.1 |
| 2012 | 27.7°C | 20.6°C | 13.6°C | 37.5°C | 5.6°C | 65 mm | 61% | 2.6 m/s | 4.9 |
| 2011 | 26.6°C | 19.6°C | 12.5°C | 41.7°C | 6.7°C | 44 mm | 57% | 2.8 m/s | 5.1 |
| 2010 | 27.0°C | 21.1°C | 15.2°C | 33.9°C | 6.7°C | 152 mm | 74% | 3.1 m/s | 4.5 |
| 2009 | 24.0°C | 18.5°C | 12.9°C | 27.8°C | 5.2°C | 93 mm | 78% | 2.4 m/s | 4.4 |
| 2008 | 24.7°C | 19.2°C | 13.7°C | 32.1°C | 7.0°C | 171 mm | 79% | 2.5 m/s | 4.2 |
| 2007 | 28.1°C | 21.6°C | 15.1°C | 33.3°C | 7.3°C | 76 mm | 70% | 3.2 m/s | 4.8 |
| 2006 | 25.0°C | 18.8°C | 12.6°C | 33.0°C | 6.6°C | 54 mm | 66% | 3 m/s | 4.8 |
| 2005 | 27.0°C | 21.4°C | 15.8°C | 31.2°C | 3.9°C | 104 mm | 75% | 2.7 m/s | 4.7 |
| 2004 | 28.3°C | 21.2°C | 14.2°C | 32.7°C | 6.8°C | 37 mm | 65% | 2.9 m/s | 5.5 |
| 2003 | 24.0°C | 17.7°C | 11.4°C | 29.6°C | 4.0°C | 70 mm | 71% | 2.9 m/s | 4.8 |
| 2002 | 30.8°C | 23.3°C | 15.9°C | 38.7°C | 7.8°C | 44 mm | 54% | 2.8 m/s | 5.1 |
| 2001 | 26.4°C | 19.8°C | 13.1°C | 33.8°C | 4.1°C | 131 mm | 68% | 2.5 m/s | 4.7 |
| 2000 | 31.5°C | 23.4°C | 15.3°C | 43.8°C | 3.8°C | 57 mm | 43% | 3.6 m/s | 4.8 |
| 1999 | 26.1°C | 19.3°C | 12.5°C | 35.1°C | 3.9°C | 132 mm | 62% | 2.9 m/s | 4.6 |
| 1998 | 30.0°C | 23.7°C | 17.4°C | 39.3°C | 9.3°C | 167 mm | 69% | 2.7 m/s | 4.6 |
| 1997 | 28.7°C | 21.8°C | 14.9°C | 35.4°C | 10.1°C | 82 mm | 66% | 2.8 m/s | 4.7 |
| 1996 | 24.9°C | 18.6°C | 12.3°C | 31.3°C | 4.2°C | 111 mm | 71% | 2.6 m/s | 4.6 |
| 1995 | 25.2°C | 18.9°C | 12.6°C | 33.4°C | -0.7°C | 76 mm | 69% | 2.8 m/s | 4.6 |
| 1994 | 27.2°C | 20.5°C | 13.8°C | 33.6°C | 7.4°C | 53 mm | 65% | 3 m/s | 4.8 |
| 1993 ❄️ | 22.5°C | 16.7°C | 10.8°C | 30.2°C | 2.8°C | 197 mm | 80% | 3 m/s | 4.3 |
| 1992 | 26.0°C | 19.6°C | 13.2°C | 31.3°C | 3.1°C | 107 mm | 70% | 3.3 m/s | 4.7 |
| 1991 | 27.7°C | 21.2°C | 14.7°C | 36.6°C | 2.9°C | 56 mm | 59% | 3.2 m/s | 4.8 |
| 1990 | 30.6°C | 23.3°C | 16.0°C | 39.7°C | 5.3°C | 21 mm | 57% | 2.7 m/s | 5.1 |
| 1989 | 22.8°C | 17.0°C | 11.2°C | 30.6°C | 1.4°C | 145 mm | 78% | 2.8 m/s | 4.4 |
| 1988 | 29.7°C | 22.5°C | 15.2°C | 37.6°C | 9.6°C | 92 mm | 56% | 3.4 m/s | 4.6 |
| 1987 | 26.5°C | 20.2°C | 13.9°C | 32.5°C | 7.9°C | 76 mm | 70% | 2.5 m/s | 4.6 |
| 1986 🌧️ | 27.1°C | 22.0°C | 16.8°C | 30.5°C | 7.7°C | 227 mm | 77% | 3.4 m/s | 3.9 |
| 1985 | 24.7°C | 19.3°C | 13.9°C | 35.0°C | 1.4°C | 190 mm | 75% | 3.7 m/s | 4.1 |
| 1984 | 27.2°C | 20.1°C | 13.1°C | 37.3°C | 0.8°C | 83 mm | 57% | 3.4 m/s | 4.6 |
| 1983 | 30.4°C | 23.2°C | 16.0°C | 37.3°C | 2.7°C | 63 mm | 52% | 3.6 m/s | — |
| 1982 | 26.6°C | 20.3°C | 14.1°C | 32.6°C | 4.6°C | 46 mm | 70% | 3.2 m/s | — |
| 1981 | 27.3°C | 20.6°C | 14.0°C | 32.5°C | 5.9°C | 53 mm | 66% | 3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 27.5°C with lows near 14.6°C (mean 21.1°C), based on 45 years of NASA POWER data.
September averages 90 mm of rainfall in Topeka, a relatively wet time of year. The wettest on record was 227 mm in 1986.
The hottest September reached 43.8°C in 2000. The coldest dipped to -0.7°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.6°C. Daytime highs moved from 27.2°C to 30.4°C and overnight lows from 14.2°C to 16.1°C over the same span.
September is one of the warmer months of the year in Topeka and a relatively wet time of year, so plan for around 27.5°C daytime highs and 14.6°C at night.
Not quite — September is the 9th coolest month in Topeka, averaging 21.1°C.
For September in Topeka, pack light layers you can adjust through the day, with typical highs of 27.5°C and lows of 14.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 67% — moderately humid.
Average wind speed in September is 2.9 m/s. The windiest September on record averaged 3.7 m/s (1985).
The wettest September on record was 1986 with 227 mm. On average, September sees 90 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 Topeka 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.
