September is one of the warmer months of the year in Lawrence, with average highs near 27.3°C and lows around 14.5°C (mean 20.9°C). It is a relatively wet time of year, averaging 97 mm of rainfall and 68% relative humidity across the period.
September is one of the warmer months of the year in Lawrence. Across 45 years of records, the warmest September in Lawrence was 2023 — when the month averaged 24°C — while the coldest was 1993 at 16.6°C. Typical September days reach 27.3°C with nights near 14.5°C. The long-term trend is warming, about 0.5°C per decade.
September is a relatively wet time of year in Lawrence, averaging 97 mm of rainfall. The wettest September on record was 1986 with 283 mm, while the driest was 1990 at 21 mm.
Relative humidity in Lawrence during September averages 68%. The most humid September was 2019 at 84%, and the least humid was 2000 at 46%.
September receives about 4.8 kWh/m²/day of solar energy in Lawrence. The sunniest September was 2004 at 5.5 kWh/m²/day, and the cloudiest was 1986 at 4.1.
Average wind speed in Lawrence during September is 2.8 m/s. The windiest September was 1985 at 3.6 m/s, while the calmest was 2025 at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.4°C | 20.2°C | 20.4°C | 21.5°C | 22.6°C | +2.2°C |
| Avg High | 26.6°C | 26.7°C | 26.9°C | 27.5°C | 29.6°C | +3°C |
| Avg Low | 14.2°C | 13.8°C | 14.0°C | 15.5°C | 15.6°C | +1.4°C |
| Avg Rain | 117 mm | 114 mm | 85 mm | 96 mm | 56 mm | -61 mm |
September temperatures in Lawrence have risen by about 2.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -0.5°C (1995) to a record high of 43.7°C (2000).
Rainfall in September is a relatively wet time of year, averaging 97 mm, with a wettest year of 283 mm.
One of the best times to visit Lawrence
September is one of the best times to visit Lawrence. Expect days averaging 27.3°C and nights around 14.5°C (mean 20.9°C) — warmer than Lawrence's yearly average — with higher rainfall (97 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 | 29.5°C | 23.0°C | 16.4°C | 36.0°C | 9.1°C | 62 mm | 66% | 1.9 m/s | 4.4 |
| 2024 | 30.4°C | 22.9°C | 15.4°C | 36.3°C | 9.7°C | 48 mm | 56% | 2.4 m/s | 5.2 |
| 2023 🔥 | 31.5°C | 24.0°C | 16.4°C | 38.1°C | 11.7°C | 53 mm | 57% | 2.5 m/s | 5.2 |
| 2022 | 30.6°C | 23.1°C | 15.6°C | 38.5°C | 7.4°C | 29 mm | 55% | 2.7 m/s | 5.2 |
| 2021 | 29.4°C | 22.8°C | 16.3°C | 33.9°C | 8.4°C | 77 mm | 67% | 2.9 m/s | 5.1 |
| 2020 | 26.2°C | 19.7°C | 13.3°C | 34.6°C | 6.5°C | 69 mm | 72% | 2.7 m/s | 4.6 |
| 2019 | 28.3°C | 23.4°C | 18.6°C | 31.3°C | 12.1°C | 122 mm | 84% | 2.9 m/s | 4.8 |
| 2018 | 27.4°C | 21.9°C | 16.4°C | 34.2°C | 6.7°C | 62 mm | 75% | 2.7 m/s | 4.4 |
| 2017 | 28.3°C | 22.1°C | 15.9°C | 32.6°C | 8.7°C | 61 mm | 68% | 2.6 m/s | 4.9 |
| 2016 | 26.5°C | 21.3°C | 16.1°C | 32.2°C | 8.4°C | 150 mm | 79% | 2.7 m/s | 5.1 |
| 2015 | 28.3°C | 22.5°C | 16.7°C | 35.1°C | 8.9°C | 89 mm | 74% | 2.9 m/s | 5 |
| 2014 | 26.6°C | 20.5°C | 14.4°C | 32.7°C | 4.6°C | 104 mm | 71% | 2.7 m/s | 4.7 |
| 2013 | 29.8°C | 22.8°C | 15.8°C | 39.6°C | 9.1°C | 86 mm | 63% | 2.8 m/s | 5.1 |
| 2012 | 27.0°C | 20.1°C | 13.3°C | 35.7°C | 5.1°C | 87 mm | 64% | 2.6 m/s | 4.7 |
| 2011 | 26.5°C | 19.4°C | 12.4°C | 40.5°C | 6.6°C | 38 mm | 58% | 2.7 m/s | 5.2 |
| 2010 | 26.6°C | 20.9°C | 15.2°C | 32.8°C | 6.7°C | 162 mm | 76% | 3 m/s | 4.8 |
| 2009 | 24.3°C | 18.6°C | 13.0°C | 28.2°C | 5.4°C | 77 mm | 78% | 2.3 m/s | 4.3 |
| 2008 | 24.4°C | 19.0°C | 13.7°C | 32.2°C | 7.3°C | 190 mm | 80% | 2.4 m/s | 4.2 |
| 2007 | 28.0°C | 21.5°C | 15.0°C | 33.0°C | 6.5°C | 83 mm | 70% | 3 m/s | 4.8 |
| 2006 | 24.9°C | 18.9°C | 12.8°C | 32.8°C | 6.8°C | 47 mm | 66% | 2.8 m/s | 4.9 |
| 2005 | 27.0°C | 21.4°C | 15.8°C | 30.6°C | 3.9°C | 98 mm | 76% | 2.6 m/s | 4.9 |
| 2004 | 27.5°C | 20.7°C | 13.9°C | 30.9°C | 6.5°C | 53 mm | 68% | 2.7 m/s | 5.5 |
| 2003 | 23.9°C | 17.6°C | 11.3°C | 29.7°C | 3.6°C | 71 mm | 72% | 2.8 m/s | 4.7 |
| 2002 | 31.1°C | 23.6°C | 16.1°C | 38.5°C | 7.8°C | 41 mm | 53% | 2.8 m/s | 5.3 |
| 2001 | 26.4°C | 19.7°C | 13.0°C | 33.9°C | 3.8°C | 120 mm | 67% | 2.5 m/s | 4.9 |
| 2000 | 31.0°C | 22.9°C | 14.9°C | 43.7°C | 3.6°C | 71 mm | 46% | 3.4 m/s | 5.1 |
| 1999 | 26.2°C | 19.3°C | 12.4°C | 34.9°C | 4.3°C | 140 mm | 61% | 2.8 m/s | 4.5 |
| 1998 | 29.2°C | 23.3°C | 17.3°C | 38.7°C | 8.9°C | 207 mm | 72% | 2.6 m/s | 4.8 |
| 1997 | 28.5°C | 21.7°C | 14.9°C | 35.2°C | 9.6°C | 91 mm | 66% | 2.7 m/s | 4.8 |
| 1996 | 25.0°C | 18.7°C | 12.4°C | 32.0°C | 4.6°C | 116 mm | 70% | 2.5 m/s | 4.4 |
| 1995 | 25.6°C | 19.1°C | 12.6°C | 33.9°C | -0.5°C | 63 mm | 67% | 2.8 m/s | 4.4 |
| 1994 | 26.8°C | 20.2°C | 13.7°C | 33.1°C | 6.4°C | 69 mm | 66% | 2.9 m/s | 4.7 |
| 1993 ❄️ | 22.3°C | 16.6°C | 10.9°C | 29.7°C | 3.0°C | 239 mm | 81% | 3 m/s | 4.3 |
| 1992 | 25.9°C | 19.4°C | 13.0°C | 31.5°C | 2.5°C | 116 mm | 71% | 3.2 m/s | 4.9 |
| 1991 | 27.2°C | 20.8°C | 14.4°C | 35.5°C | 2.8°C | 74 mm | 61% | 3.1 m/s | 4.7 |
| 1990 | 30.3°C | 23.1°C | 15.9°C | 38.8°C | 5.5°C | 21 mm | 58% | 2.6 m/s | 5 |
| 1989 | 22.8°C | 17.0°C | 11.3°C | 30.4°C | 1.2°C | 138 mm | 78% | 2.7 m/s | 4.5 |
| 1988 | 29.0°C | 22.0°C | 15.1°C | 37.6°C | 9.1°C | 136 mm | 58% | 3.2 m/s | 4.6 |
| 1987 | 26.4°C | 20.2°C | 14.0°C | 32.8°C | 8.1°C | 72 mm | 70% | 2.4 m/s | 4.8 |
| 1986 🌧️ | 26.9°C | 22.0°C | 17.0°C | 29.9°C | 7.5°C | 283 mm | 77% | 3.3 m/s | 4.1 |
| 1985 | 24.7°C | 19.3°C | 13.9°C | 34.4°C | 2.2°C | 188 mm | 75% | 3.6 m/s | 4.2 |
| 1984 | 26.9°C | 20.0°C | 13.0°C | 37.1°C | 0.8°C | 87 mm | 59% | 3.3 m/s | 4.6 |
| 1983 | 30.2°C | 23.0°C | 15.8°C | 37.2°C | 3.2°C | 62 mm | 52% | 3.5 m/s | — |
| 1982 | 25.9°C | 20.0°C | 14.0°C | 31.5°C | 4.3°C | 38 mm | 73% | 3 m/s | — |
| 1981 | 27.0°C | 20.4°C | 13.9°C | 31.6°C | 5.8°C | 53 mm | 67% | 3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 27.3°C with lows near 14.5°C (mean 20.9°C), based on 45 years of NASA POWER data.
September averages 97 mm of rainfall in Lawrence, a relatively wet time of year. The wettest on record was 283 mm in 1986.
The hottest September reached 43.7°C in 2000. The coldest dipped to -0.5°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.7°C. Daytime highs moved from 26.9°C to 30.3°C and overnight lows from 14.1°C to 16°C over the same span.
September is one of the warmer months of the year in Lawrence and a relatively wet time of year, so plan for around 27.3°C daytime highs and 14.5°C at night.
Not quite — September is the 9th coolest month in Lawrence, averaging 20.9°C.
For September in Lawrence, pack light layers you can adjust through the day, with typical highs of 27.3°C and lows of 14.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 68% — moderately humid.
Average wind speed in September is 2.8 m/s. The windiest September on record averaged 3.6 m/s (1985).
The wettest September on record was 1986 with 283 mm. On average, September sees 97 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 Lawrence 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.
