August is one of the warmer months of the year in West Chester, with average highs near 29.6°C and lows around 17.9°C (mean 23.8°C). It is about average for rainfall, averaging 106 mm of rainfall and 70% relative humidity across the period.
August is one of the warmer months of the year in West Chester. Across 45 years of records, the warmest August in West Chester was 2022 — when the month averaged 26.2°C — while the coldest was 1994 at 21.2°C. Typical August days reach 29.6°C with nights near 17.9°C. The long-term trend is warming, about 0.4°C per decade.
August is about average for rainfall in West Chester, averaging 106 mm of rainfall. The wettest August on record was 2011 with 349 mm, while the driest was 2025 at 35 mm.
Relative humidity in West Chester during August averages 70%. The most humid August was 2018 at 83%, and the least humid was 2002 at 58%.
August receives about 5.4 kWh/m²/day of solar energy in West Chester. The sunniest Augusts were 2016 and 2022 at 6.1 kWh/m²/day, and the cloudiest were 1989, 1990 and 2000 at 4.8.
Average wind speed in West Chester during August is 0.4 m/s. The windiest Augusts were 2023, 2024 and 2025, among others at 0.4 m/s, while the calmest were 2003, 2009 and 2019, among others at 0.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 23.0°C | 23.4°C | 24.2°C | 23.9°C | 24.6°C | +1.6°C |
| Avg High | 28.9°C | 29.5°C | 29.8°C | 29.5°C | 30.3°C | +1.4°C |
| Avg Low | 17.0°C | 17.3°C | 18.5°C | 18.3°C | 18.9°C | +1.9°C |
| Avg Rain | 86 mm | 103 mm | 102 mm | 126 mm | 114 mm | +29 mm |
August temperatures in West Chester have risen by about 1.9°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 6.6°C (1982) to a record high of 39°C (2002).
Rainfall in August is about average for rainfall, averaging 106 mm, with a wettest year of 349 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.3°C per decade while lows rose 0.5°C per decade, narrowing the gap between day and night.
One of the best times to visit West Chester
August is one of the best times to visit West Chester. Expect days averaging 29.6°C and nights around 17.9°C (mean 23.8°C) — warmer than West Chester's yearly average — with higher rainfall (106 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 | 23.0°C | 16.7°C | 34.8°C | 10.9°C | 35 mm | 65% | 0.4 m/s | 5.4 |
| 2024 | 30.1°C | 24.3°C | 18.4°C | 36.7°C | 11.8°C | 145 mm | 73% | 0.4 m/s | 5.4 |
| 2023 | 29.7°C | 24.1°C | 18.5°C | 33.7°C | 14.3°C | 78 mm | 69% | 0.4 m/s | 5.3 |
| 2022 🔥 | 32.3°C | 26.2°C | 20.1°C | 36.9°C | 15.2°C | 74 mm | 64% | 0.4 m/s | 6.1 |
| 2021 | 31.2°C | 25.7°C | 20.2°C | 37.6°C | 15.4°C | 142 mm | 74% | 0.4 m/s | 5 |
| 2020 | 29.1°C | 24.3°C | 19.6°C | 34.2°C | 14.8°C | 212 mm | 78% | 0.4 m/s | 5.2 |
| 2019 | 30.3°C | 24.5°C | 18.7°C | 36.9°C | 14.4°C | 76 mm | 72% | 0.3 m/s | 5.5 |
| 2018 | 28.9°C | 24.4°C | 19.9°C | 33.8°C | 14.3°C | 202 mm | 83% | 0.4 m/s | 5.6 |
| 2017 | 27.7°C | 22.4°C | 17.1°C | 33.6°C | 12.2°C | 128 mm | 76% | 0.4 m/s | 5.4 |
| 2016 | 31.9°C | 26.0°C | 20.0°C | 35.9°C | 13.7°C | 54 mm | 68% | 0.4 m/s | 6.1 |
| 2015 | 30.9°C | 24.4°C | 17.9°C | 35.0°C | 13.9°C | 60 mm | 62% | 0.4 m/s | 5.9 |
| 2014 | 28.4°C | 22.3°C | 16.2°C | 33.4°C | 11.3°C | 84 mm | 71% | 0.4 m/s | 5.5 |
| 2013 | 27.2°C | 22.2°C | 17.3°C | 31.4°C | 10.9°C | 137 mm | 78% | 0.4 m/s | 5 |
| 2012 | 30.0°C | 24.4°C | 18.9°C | 33.9°C | 13.9°C | 105 mm | 70% | 0.4 m/s | 5.3 |
| 2011 🌧️ | 28.6°C | 23.3°C | 18.0°C | 33.4°C | 11.9°C | 349 mm | 76% | 0.4 m/s | 5.2 |
| 2010 | 31.2°C | 25.0°C | 18.7°C | 36.6°C | 12.7°C | 62 mm | 65% | 0.4 m/s | 5.3 |
| 2009 | 28.5°C | 23.9°C | 19.3°C | 32.7°C | 13.6°C | 209 mm | 82% | 0.3 m/s | 5.3 |
| 2008 | 29.3°C | 22.9°C | 16.5°C | 32.4°C | 12.4°C | 49 mm | 65% | 0.4 m/s | 5.9 |
| 2007 | 30.9°C | 24.7°C | 18.5°C | 36.1°C | 13.7°C | 109 mm | 69% | 0.4 m/s | 5.2 |
| 2006 | 30.0°C | 24.3°C | 18.6°C | 34.7°C | 12.6°C | 77 mm | 69% | 0.4 m/s | 5.6 |
| 2005 | 31.7°C | 25.9°C | 20.1°C | 37.4°C | 14.2°C | 65 mm | 68% | 0.4 m/s | 5.2 |
| 2004 | 27.4°C | 22.3°C | 17.3°C | 31.5°C | 11.3°C | 131 mm | 82% | 0.4 m/s | 5.1 |
| 2003 | 28.5°C | 23.8°C | 19.1°C | 31.0°C | 12.5°C | 126 mm | 83% | 0.3 m/s | 5.1 |
| 2002 | 32.4°C | 25.9°C | 19.4°C | 39.0°C | 14.4°C | 65 mm | 58% | 0.4 m/s | 5.4 |
| 2001 | 31.9°C | 25.5°C | 19.1°C | 38.6°C | 15.1°C | 92 mm | 65% | 0.4 m/s | 5.4 |
| 2000 | 27.8°C | 22.5°C | 17.2°C | 32.6°C | 10.0°C | 97 mm | 74% | 0.4 m/s | 4.8 |
| 1999 | 30.8°C | 24.5°C | 18.2°C | 36.3°C | 13.0°C | 115 mm | 59% | 0.4 m/s | 5.3 |
| 1998 | 30.8°C | 24.4°C | 18.0°C | 34.0°C | 10.7°C | 81 mm | 66% | 0.4 m/s | 5.7 |
| 1997 | 28.8°C | 22.7°C | 16.6°C | 35.0°C | 12.2°C | 109 mm | 65% | 0.4 m/s | 5.4 |
| 1996 | 27.7°C | 22.3°C | 16.8°C | 31.6°C | 13.4°C | 87 mm | 78% | 0.3 m/s | 5.5 |
| 1995 | 32.3°C | 25.2°C | 18.1°C | 36.7°C | 13.4°C | 39 mm | 59% | 0.4 m/s | 5.7 |
| 1994 ❄️ | 26.7°C | 21.2°C | 15.8°C | 32.0°C | 9.7°C | 152 mm | 78% | 0.4 m/s | 5.2 |
| 1993 | 30.8°C | 24.5°C | 18.2°C | 35.4°C | 13.7°C | 96 mm | 67% | 0.3 m/s | 5.5 |
| 1992 | 28.1°C | 22.0°C | 15.9°C | 32.8°C | 11.1°C | 73 mm | 68% | 0.4 m/s | 5.5 |
| 1991 | 30.7°C | 24.5°C | 18.3°C | 36.3°C | 15.1°C | 113 mm | 66% | 0.4 m/s | 5.6 |
| 1990 | 28.2°C | 22.8°C | 17.4°C | 33.3°C | 13.2°C | 169 mm | 76% | 0.4 m/s | 4.8 |
| 1989 | 26.8°C | 22.1°C | 17.4°C | 30.4°C | 11.8°C | 82 mm | 81% | 0.4 m/s | 4.8 |
| 1988 | 30.8°C | 24.7°C | 18.5°C | 36.6°C | 10.9°C | 99 mm | 67% | 0.4 m/s | 5.3 |
| 1987 | 30.1°C | 23.6°C | 17.1°C | 35.6°C | 10.1°C | 91 mm | 65% | 0.4 m/s | 5.3 |
| 1986 | 27.9°C | 22.1°C | 16.3°C | 32.6°C | 7.4°C | 125 mm | 69% | 0.4 m/s | 5.4 |
| 1985 | 28.3°C | 22.6°C | 17.0°C | 34.7°C | 12.7°C | 85 mm | 70% | 0.4 m/s | 5.4 |
| 1984 | 27.5°C | 22.4°C | 17.3°C | 30.2°C | 9.4°C | 68 mm | 80% | 0.4 m/s | 6 |
| 1983 | 31.9°C | 25.0°C | 18.2°C | 37.6°C | 10.8°C | 62 mm | 63% | 0.4 m/s | — |
| 1982 | 28.0°C | 21.6°C | 15.2°C | 33.0°C | 6.6°C | 74 mm | 65% | 0.4 m/s | — |
| 1981 | 29.0°C | 22.5°C | 16.0°C | 31.9°C | 9.9°C | 84 mm | 66% | 0.4 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 29.6°C with lows near 17.9°C (mean 23.8°C), based on 45 years of NASA POWER data.
August averages 106 mm of rainfall in West Chester, about average for rainfall. The wettest on record was 349 mm in 2011.
The hottest August reached 39°C in 2002. The coldest dipped to 6.6°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.9°C. Daytime highs moved from 28.9°C to 30.5°C and overnight lows from 16.7°C to 18.8°C over the same span.
August is one of the warmer months of the year in West Chester and about average for rainfall, so plan for around 29.6°C daytime highs and 17.9°C at night.
Not quite — August is the 11th coolest month in West Chester, averaging 23.8°C.
For August in West Chester, pack light layers you can adjust through the day, with typical highs of 29.6°C and lows of 17.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 70% — moderately humid.
Average wind speed in August is 0.4 m/s. The windiest August on record averaged 0.4 m/s (1981).
The wettest August on record was 2011 with 349 mm. On average, August sees 106 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 West Chester behaves each August, 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 August specifically, along with year-by-year records and how the month has changed over the decades.
