July is one of the warmer months of the year in Williamsport, with average highs near 26.5°C and lows around 15°C (mean 20.8°C). It is a relatively wet time of year, averaging 106 mm of rainfall and 75% relative humidity across the period.
July is one of the warmer months of the year in Williamsport. Across 45 years of records, the warmest July in Williamsport was 1999 — when the month averaged 23.5°C — while the coldest was 2000 at 18.2°C. Typical July days reach 26.5°C with nights near 15°C. The long-term trend is warming, about 0.5°C per decade.
July is a relatively wet time of year in Williamsport, averaging 106 mm of rainfall. The wettest July on record was 2018 with 245 mm, while the driest was 1999 at 47 mm.
Relative humidity in Williamsport during July averages 75%. The most humid July was 2004 at 85%, and the least humid was 1999 at 60%.
July receives about 5.8 kWh/m²/day of solar energy in Williamsport. The sunniest July was 2011 at 6.5 kWh/m²/day, and the cloudiest was 2004 at 4.9.
Average wind speed in Williamsport during July is 0.1 m/s. The windiest Julys were 2023, 2024 and 2025, among others at 0.1 m/s, while the calmest were 2013, 2017 and 2022, 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 | 20.2°C | 20.5°C | 20.1°C | 21.4°C | 22.0°C | +1.8°C |
| Avg High | 26.0°C | 26.4°C | 25.8°C | 27.1°C | 27.7°C | +1.7°C |
| Avg Low | 14.3°C | 14.7°C | 14.4°C | 15.8°C | 16.3°C | +2°C |
| Avg Rain | 105 mm | 88 mm | 104 mm | 115 mm | 121 mm | +16 mm |
July temperatures in Williamsport have risen by about 2.5°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 6°C (1982) to a record high of 37.8°C (2018).
Rainfall in July is a relatively wet time of year, averaging 106 mm, with a wettest year of 245 mm.
One of the best times to visit Williamsport
July is one of the best times to visit Williamsport. Expect days averaging 26.5°C and nights around 15°C (mean 20.8°C) — warmer than Williamsport'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 | 28.5°C | 22.8°C | 17.0°C | 35.0°C | 10.9°C | 79 mm | 75% | 0.1 m/s | 6 |
| 2024 | 28.1°C | 22.2°C | 16.3°C | 31.4°C | 9.6°C | 98 mm | 73% | 0.1 m/s | 6 |
| 2023 | 26.9°C | 21.6°C | 16.2°C | 31.3°C | 12.6°C | 161 mm | 78% | 0.1 m/s | 5.6 |
| 2022 | 28.9°C | 22.3°C | 15.7°C | 33.4°C | 10.4°C | 52 mm | 66% | 0 m/s | 6.2 |
| 2021 | 25.4°C | 20.4°C | 15.5°C | 30.5°C | 7.9°C | 189 mm | 82% | 0.1 m/s | 5.3 |
| 2020 | 28.2°C | 22.6°C | 17.1°C | 33.4°C | 14.3°C | 148 mm | 77% | 0.1 m/s | 6.3 |
| 2019 | 26.6°C | 21.7°C | 16.8°C | 32.0°C | 11.2°C | 129 mm | 84% | 0.1 m/s | 6 |
| 2018 🌧️ | 26.0°C | 20.7°C | 15.5°C | 37.8°C | 9.4°C | 245 mm | 81% | 0.1 m/s | 6 |
| 2017 | 25.6°C | 20.4°C | 15.3°C | 29.1°C | 10.5°C | 141 mm | 82% | 0 m/s | 5.5 |
| 2016 | 29.6°C | 23.1°C | 16.5°C | 34.0°C | 10.0°C | 73 mm | 62% | 0.1 m/s | 6.2 |
| 2015 | 26.0°C | 20.2°C | 14.4°C | 31.3°C | 8.8°C | 102 mm | 76% | 0.1 m/s | 6 |
| 2014 | 25.2°C | 19.5°C | 13.8°C | 30.2°C | 8.6°C | 94 mm | 76% | 0.1 m/s | 5.8 |
| 2013 | 26.4°C | 21.6°C | 16.8°C | 31.8°C | 9.3°C | 100 mm | 80% | 0 m/s | 5.8 |
| 2012 | 29.0°C | 22.8°C | 16.7°C | 34.4°C | 13.7°C | 107 mm | 69% | 0 m/s | 6 |
| 2011 | 26.7°C | 21.4°C | 16.0°C | 35.5°C | 10.0°C | 61 mm | 80% | 0.1 m/s | 6.5 |
| 2010 | 29.9°C | 22.9°C | 16.0°C | 36.6°C | 8.0°C | 97 mm | 64% | 0.1 m/s | 6.4 |
| 2009 | 23.9°C | 18.6°C | 13.2°C | 28.0°C | 8.0°C | 134 mm | 77% | 0.1 m/s | 5.7 |
| 2008 | 25.9°C | 20.6°C | 15.3°C | 32.8°C | 10.5°C | 108 mm | 79% | 0.1 m/s | 5.8 |
| 2007 | 26.7°C | 20.3°C | 14.0°C | 33.1°C | 7.2°C | 78 mm | 67% | 0 m/s | 5.8 |
| 2006 | 25.8°C | 21.0°C | 16.2°C | 29.3°C | 10.3°C | 111 mm | 84% | 0 m/s | 5.9 |
| 2005 | 27.9°C | 22.0°C | 16.1°C | 32.5°C | 9.2°C | 81 mm | 73% | 0.1 m/s | 5.8 |
| 2004 | 24.2°C | 19.4°C | 14.5°C | 30.3°C | 10.5°C | 212 mm | 85% | 0 m/s | 4.9 |
| 2003 | 24.8°C | 19.6°C | 14.4°C | 27.9°C | 8.9°C | 137 mm | 81% | 0.1 m/s | 5.8 |
| 2002 | 28.6°C | 22.0°C | 15.4°C | 33.3°C | 9.0°C | 49 mm | 67% | 0 m/s | 6.2 |
| 2001 | 26.5°C | 19.7°C | 12.9°C | 34.0°C | 7.6°C | 60 mm | 62% | 0.1 m/s | 5.9 |
| 2000 ❄️ | 24.0°C | 18.2°C | 12.4°C | 27.3°C | 7.4°C | 75 mm | 75% | 0.1 m/s | 5.4 |
| 1999 🔥 | 30.5°C | 23.5°C | 16.4°C | 36.0°C | 8.9°C | 47 mm | 60% | 0.1 m/s | 6.1 |
| 1998 | 24.2°C | 19.0°C | 13.7°C | 27.6°C | 9.4°C | 50 mm | 79% | 0.1 m/s | 5.7 |
| 1997 | 26.9°C | 20.2°C | 13.5°C | 33.5°C | 7.7°C | 56 mm | 67% | 0.1 m/s | 6 |
| 1996 | 23.6°C | 18.4°C | 13.3°C | 26.9°C | 7.7°C | 118 mm | 82% | 0 m/s | 5.6 |
| 1995 | 28.4°C | 22.1°C | 15.8°C | 34.6°C | 7.2°C | 72 mm | 71% | 0 m/s | 5.5 |
| 1994 | 25.6°C | 20.7°C | 15.7°C | 29.5°C | 10.8°C | 121 mm | 83% | 0.1 m/s | 5.5 |
| 1993 | 27.3°C | 21.2°C | 15.2°C | 30.9°C | 9.8°C | 50 mm | 72% | 0 m/s | 5.9 |
| 1992 | 23.9°C | 18.8°C | 13.7°C | 28.9°C | 8.5°C | 175 mm | 83% | 0 m/s | 5.4 |
| 1991 | 28.6°C | 21.8°C | 15.1°C | 34.8°C | 10.4°C | 74 mm | 65% | 0.1 m/s | 5.8 |
| 1990 | 25.1°C | 19.6°C | 14.1°C | 30.7°C | 7.7°C | 118 mm | 80% | 0 m/s | 5.2 |
| 1989 | 24.7°C | 20.0°C | 15.2°C | 30.4°C | 9.2°C | 86 mm | 81% | 0.1 m/s | 5.5 |
| 1988 | 30.4°C | 23.1°C | 15.9°C | 36.2°C | 6.9°C | 127 mm | 63% | 0.1 m/s | 5.7 |
| 1987 | 27.6°C | 21.7°C | 15.8°C | 33.4°C | 9.3°C | 117 mm | 75% | 0.1 m/s | 5.9 |
| 1986 | 25.3°C | 19.8°C | 14.3°C | 29.7°C | 6.0°C | 143 mm | 81% | 0.1 m/s | 5.5 |
| 1985 | 25.9°C | 19.4°C | 12.8°C | 29.6°C | 7.5°C | 125 mm | 73% | 0.1 m/s | 5.9 |
| 1984 | 23.4°C | 18.3°C | 13.3°C | 27.4°C | 7.3°C | 120 mm | 83% | 0.1 m/s | 5.2 |
| 1983 | 26.0°C | 20.1°C | 14.2°C | 30.0°C | 6.4°C | 60 mm | 76% | 0.1 m/s | — |
| 1982 | 25.1°C | 19.3°C | 13.5°C | 28.9°C | 6.0°C | 75 mm | 79% | 0.1 m/s | — |
| 1981 | 25.9°C | 19.9°C | 13.8°C | 31.0°C | 6.4°C | 97 mm | 73% | 0.1 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 26.5°C with lows near 15°C (mean 20.8°C), based on 45 years of NASA POWER data.
July averages 106 mm of rainfall in Williamsport, a relatively wet time of year. The wettest on record was 245 mm in 2018.
The hottest July reached 37.8°C in 2018. The coldest dipped to 6°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 2.5°C. Daytime highs moved from 25.3°C to 27.6°C and overnight lows from 13.5°C to 16.1°C over the same span.
July is one of the warmer months of the year in Williamsport and a relatively wet time of year, so plan for around 26.5°C daytime highs and 15°C at night.
Not quite — July is the 12th coolest month in Williamsport, averaging 20.8°C.
For July in Williamsport, pack light layers you can adjust through the day, with typical highs of 26.5°C and lows of 15°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 75% — quite humid.
Average wind speed in July is 0.1 m/s. The windiest July on record averaged 0.1 m/s (1981).
The wettest July on record was 2018 with 245 mm. On average, July 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 Williamsport behaves each July, 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 July specifically, along with year-by-year records and how the month has changed over the decades.
