August is one of the warmer months of the year in Williamsport, with average highs near 26.3°C and lows around 14.3°C (mean 20.3°C). It is a relatively wet time of year, averaging 99 mm of rainfall and 72% relative humidity across the period.
August is one of the warmer months of the year in Williamsport. Across 45 years of records, the warmest August in Williamsport was 1995 — when the month averaged 22.8°C — while the coldest was 1994 at 17.7°C. Typical August days reach 26.3°C with nights near 14.3°C. The long-term trend is warming, about 0.3°C per decade.
August is a relatively wet time of year in Williamsport, averaging 99 mm of rainfall. The wettest August on record was 1994 with 189 mm, while the driest were 2002 and 2025 at 42 mm.
Relative humidity in Williamsport during August averages 72%. The most humid August was 2018 at 87%, and the least humid was 1995 at 59%.
August receives about 5.1 kWh/m²/day of solar energy in Williamsport. The sunniest Augusts were 2020 and 2025 at 5.6 kWh/m²/day, and the cloudiest were 2011 and 2024 at 4.5.
Average wind speed in Williamsport during August is 0.1 m/s. The windiest Augusts were 2022, 2024 and 2025, among others at 0.1 m/s, while the calmest were 2018, 2020 and 2023, among others at 0 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.6°C | 20.0°C | 20.7°C | 20.3°C | 21.0°C | +1.4°C |
| Avg High | 25.9°C | 26.2°C | 26.5°C | 26.1°C | 26.8°C | +0.9°C |
| Avg Low | 13.4°C | 13.8°C | 14.8°C | 14.6°C | 15.2°C | +1.8°C |
| Avg Rain | 82 mm | 95 mm | 98 mm | 108 mm | 115 mm | +33 mm |
August temperatures in Williamsport have risen by about 1.4°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 2°C (1982) to a record high of 36.1°C (2001).
Rainfall in August is a relatively wet time of year, averaging 99 mm, with a wettest year of 189 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.1°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
One of the best times to visit Williamsport
August is one of the best times to visit Williamsport. Expect days averaging 26.3°C and nights around 14.3°C (mean 20.3°C) — warmer than Williamsport's yearly average — with higher rainfall (99 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 | 27.5°C | 20.5°C | 13.5°C | 34.3°C | 5.8°C | 42 mm | 61% | 0.1 m/s | 5.6 |
| 2024 | 24.9°C | 19.8°C | 14.8°C | 32.2°C | 7.9°C | 185 mm | 81% | 0.1 m/s | 4.5 |
| 2023 | 25.0°C | 19.6°C | 14.3°C | 28.6°C | 9.6°C | 162 mm | 79% | 0 m/s | 4.8 |
| 2022 | 28.3°C | 22.1°C | 15.8°C | 32.5°C | 9.7°C | 92 mm | 67% | 0.1 m/s | 5.5 |
| 2021 | 27.1°C | 22.1°C | 17.1°C | 32.1°C | 11.0°C | 136 mm | 79% | 0.1 m/s | 4.8 |
| 2020 | 28.0°C | 21.9°C | 15.7°C | 32.7°C | 10.0°C | 76 mm | 70% | 0 m/s | 5.6 |
| 2019 | 24.6°C | 19.6°C | 14.7°C | 27.7°C | 10.2°C | 93 mm | 82% | 0.1 m/s | 5.3 |
| 2018 | 25.4°C | 21.0°C | 16.6°C | 29.3°C | 10.7°C | 178 mm | 87% | 0 m/s | 4.7 |
| 2017 | 24.6°C | 18.8°C | 13.0°C | 30.9°C | 7.6°C | 89 mm | 78% | 0.1 m/s | 5.3 |
| 2016 | 28.8°C | 22.7°C | 16.7°C | 32.3°C | 11.6°C | 100 mm | 71% | 0.1 m/s | 5.5 |
| 2015 | 27.0°C | 20.4°C | 13.8°C | 32.0°C | 9.6°C | 76 mm | 68% | 0.1 m/s | 5.5 |
| 2014 | 24.8°C | 18.9°C | 12.9°C | 29.4°C | 7.9°C | 115 mm | 75% | 0.1 m/s | 5 |
| 2013 | 26.1°C | 19.9°C | 13.7°C | 30.7°C | 6.8°C | 78 mm | 71% | 0.1 m/s | 5.2 |
| 2012 | 27.1°C | 20.9°C | 14.8°C | 32.8°C | 9.4°C | 83 mm | 69% | 0.1 m/s | 5.4 |
| 2011 | 24.7°C | 19.5°C | 14.4°C | 30.2°C | 7.2°C | 173 mm | 79% | 0.1 m/s | 4.5 |
| 2010 | 27.5°C | 21.3°C | 15.1°C | 32.9°C | 8.5°C | 91 mm | 68% | 0.1 m/s | 4.9 |
| 2009 | 25.4°C | 20.2°C | 15.0°C | 30.4°C | 8.0°C | 113 mm | 80% | 0.1 m/s | 5 |
| 2008 | 24.7°C | 18.7°C | 12.6°C | 29.3°C | 7.1°C | 65 mm | 72% | 0.1 m/s | 5.5 |
| 2007 | 27.6°C | 21.4°C | 15.3°C | 34.2°C | 10.5°C | 116 mm | 70% | 0.1 m/s | 5.1 |
| 2006 | 25.5°C | 19.8°C | 14.2°C | 31.3°C | 7.8°C | 120 mm | 75% | 0 m/s | 5.4 |
| 2005 | 29.0°C | 22.6°C | 16.2°C | 34.5°C | 10.8°C | 115 mm | 66% | 0 m/s | 4.8 |
| 2004 | 23.8°C | 18.9°C | 14.0°C | 28.0°C | 7.4°C | 127 mm | 84% | 0.1 m/s | 4.7 |
| 2003 | 25.3°C | 20.4°C | 15.4°C | 28.4°C | 8.6°C | 115 mm | 83% | 0.1 m/s | 4.9 |
| 2002 | 29.1°C | 22.4°C | 15.6°C | 34.5°C | 10.2°C | 42 mm | 59% | 0.1 m/s | 5.4 |
| 2001 | 29.1°C | 22.5°C | 15.9°C | 36.1°C | 9.9°C | 109 mm | 63% | 0.1 m/s | 5 |
| 2000 | 25.4°C | 19.7°C | 14.0°C | 30.1°C | 5.6°C | 61 mm | 73% | 0.1 m/s | 4.8 |
| 1999 | 27.2°C | 20.5°C | 13.7°C | 31.6°C | 8.7°C | 80 mm | 63% | 0 m/s | 5.1 |
| 1998 | 27.2°C | 21.1°C | 14.9°C | 30.6°C | 6.7°C | 51 mm | 70% | 0.1 m/s | 5.1 |
| 1997 | 24.8°C | 18.8°C | 12.9°C | 30.0°C | 7.9°C | 133 mm | 71% | 0.1 m/s | 4.6 |
| 1996 | 25.5°C | 19.5°C | 13.6°C | 28.9°C | 8.2°C | 61 mm | 76% | 0.1 m/s | 5.4 |
| 1995 🔥 | 30.1°C | 22.8°C | 15.5°C | 34.8°C | 9.3°C | 45 mm | 59% | 0 m/s | 5.5 |
| 1994 ❄️ 🌧️ | 22.9°C | 17.7°C | 12.4°C | 27.0°C | 6.0°C | 189 mm | 82% | 0.1 m/s | 4.7 |
| 1993 | 27.4°C | 20.9°C | 14.5°C | 33.6°C | 6.6°C | 99 mm | 69% | 0.1 m/s | 5 |
| 1992 | 23.7°C | 17.8°C | 11.9°C | 29.7°C | 6.9°C | 85 mm | 77% | 0.1 m/s | 5.3 |
| 1991 | 28.2°C | 21.4°C | 14.7°C | 34.1°C | 10.1°C | 80 mm | 65% | 0.1 m/s | 5.1 |
| 1990 | 25.2°C | 19.5°C | 13.8°C | 29.1°C | 9.9°C | 131 mm | 77% | 0.1 m/s | 4.6 |
| 1989 | 25.6°C | 19.7°C | 13.7°C | 29.7°C | 7.1°C | 53 mm | 72% | 0.1 m/s | 4.8 |
| 1988 | 28.5°C | 21.8°C | 15.1°C | 35.4°C | 5.9°C | 125 mm | 64% | 0.1 m/s | 5.1 |
| 1987 | 26.8°C | 19.9°C | 13.1°C | 33.8°C | 6.3°C | 104 mm | 66% | 0 m/s | 4.6 |
| 1986 | 23.8°C | 18.2°C | 12.6°C | 28.0°C | 3.7°C | 82 mm | 74% | 0.1 m/s | 5.2 |
| 1985 | 25.5°C | 19.2°C | 12.9°C | 31.4°C | 8.9°C | 88 mm | 69% | 0.1 m/s | 4.8 |
| 1984 | 24.3°C | 19.2°C | 14.2°C | 27.9°C | 6.4°C | 116 mm | 83% | 0.1 m/s | 5.4 |
| 1983 | 27.4°C | 20.9°C | 14.4°C | 32.3°C | 9.0°C | 74 mm | 70% | 0.1 m/s | — |
| 1982 | 24.7°C | 17.9°C | 11.2°C | 29.1°C | 2.0°C | 57 mm | 69% | 0.1 m/s | — |
| 1981 | 26.4°C | 19.8°C | 13.1°C | 29.8°C | 6.2°C | 42 mm | 66% | 0.1 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 26.3°C with lows near 14.3°C (mean 20.3°C), based on 45 years of NASA POWER data.
August averages 99 mm of rainfall in Williamsport, a relatively wet time of year. The wettest on record was 189 mm in 1994.
The hottest August reached 36.1°C in 2001. The coldest dipped to 2°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.4°C. Daytime highs moved from 25.7°C to 26.6°C and overnight lows from 13.2°C to 15.1°C over the same span.
August is one of the warmer months of the year in Williamsport and a relatively wet time of year, so plan for around 26.3°C daytime highs and 14.3°C at night.
Not quite — August is the 11th coolest month in Williamsport, averaging 20.3°C.
For August in Williamsport, pack light layers you can adjust through the day, with typical highs of 26.3°C and lows of 14.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 72% — moderately humid.
Average wind speed in August is 0.1 m/s. The windiest August on record averaged 0.1 m/s (1981).
The wettest August on record was 1994 with 189 mm. On average, August sees 99 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 Williamsport 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.
