June is one of the warmer months of the year in Williamsport, with average highs near 23.5°C and lows around 12.3°C (mean 17.9°C). It is a relatively wet time of year, averaging 104 mm of rainfall and 79% relative humidity across the period.
June is one of the warmer months of the year in Williamsport. Across 45 years of records, the warmest June in Williamsport was 2005 — when the month averaged 20°C — while the coldest was 1985 at 15.4°C. Typical June days reach 23.5°C with nights near 12.3°C. The long-term trend is warming, about 0.4°C per decade.
June is a relatively wet time of year in Williamsport, averaging 104 mm of rainfall. The wettest June on record was 2006 with 214 mm, while the driest was 1988 at 30 mm.
Relative humidity in Williamsport during June averages 79%. The most humid June was 1989 at 84%, and the least humid was 1988 at 64%.
June receives about 5.8 kWh/m²/day of solar energy in Williamsport. The sunniest Junes were 1988, 2007 and 2020 at 6.6 kWh/m²/day, and the cloudiest were 2000 and 2003 at 4.8.
Average wind speed in Williamsport during June is 0.1 m/s. The windiest Junes were 2022, 2023 and 2024, among others at 0.1 m/s, while the calmest were 2019, 2021 and 2025, 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 | 17.1°C | 17.8°C | 18.1°C | 18.2°C | 18.6°C | +1.5°C |
| Avg High | 22.7°C | 23.6°C | 23.5°C | 23.6°C | 24.2°C | +1.5°C |
| Avg Low | 11.3°C | 12.0°C | 12.7°C | 12.7°C | 13.1°C | +1.8°C |
| Avg Rain | 121 mm | 87 mm | 116 mm | 102 mm | 91 mm | -30 mm |
June temperatures in Williamsport have risen by about 2°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 0°C (1986) to a record high of 33.2°C (2021).
Rainfall in June is a relatively wet time of year, averaging 104 mm, with a wettest year of 214 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 Williamsport
June is one of the best times to visit Williamsport. Expect days averaging 23.5°C and nights around 12.3°C (mean 17.9°C) — warmer than Williamsport's yearly average — with higher rainfall (104 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 | 24.9°C | 19.8°C | 14.7°C | 30.9°C | 2.4°C | 124 mm | 84% | 0 m/s | 5.5 |
| 2024 | 24.7°C | 19.2°C | 13.8°C | 31.7°C | 5.8°C | 94 mm | 79% | 0.1 m/s | 6.1 |
| 2023 | 23.1°C | 17.4°C | 11.8°C | 29.5°C | 5.4°C | 102 mm | 75% | 0.1 m/s | 5.4 |
| 2022 | 23.6°C | 17.8°C | 11.9°C | 29.0°C | 5.8°C | 82 mm | 76% | 0.1 m/s | 6.5 |
| 2021 | 25.1°C | 19.4°C | 13.8°C | 33.2°C | 5.0°C | 74 mm | 78% | 0 m/s | 6 |
| 2020 | 23.5°C | 17.9°C | 12.4°C | 27.7°C | 3.0°C | 69 mm | 80% | 0.1 m/s | 6.6 |
| 2019 | 22.6°C | 17.2°C | 11.7°C | 29.0°C | 2.4°C | 145 mm | 81% | 0 m/s | 5.9 |
| 2018 | 23.1°C | 17.9°C | 12.8°C | 29.2°C | 7.6°C | 78 mm | 80% | 0.1 m/s | 5.8 |
| 2017 | 22.9°C | 17.8°C | 12.7°C | 28.9°C | 6.9°C | 95 mm | 81% | 0 m/s | 6.2 |
| 2016 | 24.4°C | 18.4°C | 12.5°C | 29.7°C | 3.8°C | 70 mm | 71% | 0.1 m/s | 6.4 |
| 2015 | 23.7°C | 18.3°C | 12.9°C | 29.2°C | 5.6°C | 178 mm | 81% | 0 m/s | 5 |
| 2014 | 23.6°C | 18.2°C | 12.7°C | 26.9°C | 6.9°C | 88 mm | 81% | 0.1 m/s | 6.1 |
| 2013 | 23.3°C | 18.3°C | 13.3°C | 28.7°C | 5.3°C | 134 mm | 81% | 0.1 m/s | 5.7 |
| 2012 | 23.1°C | 17.6°C | 12.1°C | 30.8°C | 6.6°C | 85 mm | 79% | 0 m/s | 6.2 |
| 2011 | 23.5°C | 18.3°C | 13.1°C | 27.6°C | 5.2°C | 77 mm | 82% | 0 m/s | 5.8 |
| 2010 | 25.5°C | 19.5°C | 13.5°C | 31.0°C | 6.0°C | 75 mm | 75% | 0 m/s | 5.7 |
| 2009 | 22.4°C | 17.4°C | 12.3°C | 26.9°C | 2.3°C | 120 mm | 81% | 0.1 m/s | 5.1 |
| 2008 | 24.0°C | 19.0°C | 14.0°C | 29.4°C | 7.4°C | 96 mm | 83% | 0 m/s | 6.1 |
| 2007 | 24.6°C | 18.3°C | 12.0°C | 31.8°C | 6.2°C | 73 mm | 75% | 0.1 m/s | 6.6 |
| 2006 🌧️ | 22.1°C | 17.3°C | 12.5°C | 29.0°C | 3.4°C | 214 mm | 82% | 0.1 m/s | 5.2 |
| 2005 🔥 | 25.3°C | 20.0°C | 14.6°C | 32.3°C | 7.7°C | 71 mm | 81% | 0.1 m/s | 6 |
| 2004 | 22.1°C | 16.8°C | 11.6°C | 28.4°C | 5.6°C | 84 mm | 81% | 0 m/s | 5.8 |
| 2003 | 21.6°C | 16.7°C | 11.7°C | 31.5°C | 3.2°C | 134 mm | 84% | 0 m/s | 4.8 |
| 2002 | 23.8°C | 18.5°C | 13.1°C | 28.7°C | 5.3°C | 120 mm | 80% | 0.1 m/s | 5.9 |
| 2001 | 25.6°C | 19.2°C | 12.8°C | 31.8°C | 3.6°C | 113 mm | 70% | 0.1 m/s | 6.2 |
| 2000 | 23.2°C | 18.0°C | 12.8°C | 27.3°C | 5.3°C | 132 mm | 82% | 0 m/s | 4.8 |
| 1999 | 26.2°C | 19.4°C | 12.6°C | 32.7°C | 6.6°C | 75 mm | 65% | 0.1 m/s | 6.2 |
| 1998 | 22.1°C | 17.1°C | 12.2°C | 28.3°C | 2.6°C | 140 mm | 83% | 0 m/s | 5.2 |
| 1997 | 23.4°C | 17.6°C | 11.8°C | 28.6°C | 5.5°C | 71 mm | 78% | 0.1 m/s | 6 |
| 1996 | 23.3°C | 18.3°C | 13.3°C | 29.4°C | 7.4°C | 121 mm | 84% | 0 m/s | 5.7 |
| 1995 | 24.2°C | 18.4°C | 12.7°C | 32.1°C | 6.0°C | 72 mm | 78% | 0.1 m/s | 5.7 |
| 1994 | 24.2°C | 18.4°C | 12.7°C | 31.2°C | 3.8°C | 146 mm | 81% | 0 m/s | 5.9 |
| 1993 | 22.4°C | 16.7°C | 11.0°C | 26.8°C | 2.9°C | 74 mm | 80% | 0.1 m/s | 5.9 |
| 1992 | 21.7°C | 16.0°C | 10.3°C | 27.6°C | 3.3°C | 57 mm | 78% | 0.1 m/s | 6.1 |
| 1991 | 25.4°C | 18.7°C | 12.1°C | 31.9°C | 6.4°C | 34 mm | 70% | 0.1 m/s | 6.2 |
| 1990 | 22.6°C | 17.0°C | 11.4°C | 28.4°C | 4.0°C | 85 mm | 81% | 0.1 m/s | 5.2 |
| 1989 | 22.8°C | 18.0°C | 13.1°C | 28.5°C | 6.4°C | 161 mm | 84% | 0 m/s | 5 |
| 1988 | 23.8°C | 16.9°C | 9.9°C | 32.1°C | 1.6°C | 30 mm | 64% | 0 m/s | 6.6 |
| 1987 | 24.3°C | 18.7°C | 13.0°C | 29.5°C | 4.7°C | 98 mm | 77% | 0.1 m/s | 5.8 |
| 1986 | 22.4°C | 16.6°C | 10.9°C | 25.8°C | 0.0°C | 132 mm | 79% | 0 m/s | 6.3 |
| 1985 ❄️ | 21.3°C | 15.4°C | 9.5°C | 26.1°C | 5.1°C | 78 mm | 76% | 0 m/s | 5.8 |
| 1984 | 23.1°C | 17.4°C | 11.7°C | 28.3°C | 3.4°C | 128 mm | 81% | 0.1 m/s | 5.8 |
| 1983 | 23.0°C | 17.4°C | 11.7°C | 29.4°C | 2.0°C | 143 mm | 79% | 0.1 m/s | — |
| 1982 | 20.6°C | 15.5°C | 10.4°C | 27.8°C | 6.0°C | 177 mm | 84% | 0.1 m/s | — |
| 1981 | 23.3°C | 17.6°C | 11.8°C | 28.4°C | 3.7°C | 140 mm | 79% | 0.1 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 23.5°C with lows near 12.3°C (mean 17.9°C), based on 45 years of NASA POWER data.
June averages 104 mm of rainfall in Williamsport, a relatively wet time of year. The wettest on record was 214 mm in 2006.
The hottest June reached 33.2°C in 2021. The coldest dipped to 0°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 2°C. Daytime highs moved from 22.3°C to 24.3°C and overnight lows from 11°C to 13.2°C over the same span.
June is one of the warmer months of the year in Williamsport and a relatively wet time of year, so plan for around 23.5°C daytime highs and 12.3°C at night.
Not quite — June is the 10th coolest month in Williamsport, averaging 17.9°C.
For June in Williamsport, pack light layers you can adjust through the day, with typical highs of 23.5°C and lows of 12.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in June averages 79% — quite humid.
Average wind speed in June is 0.1 m/s. The windiest June on record averaged 0.1 m/s (1981).
The wettest June on record was 2006 with 214 mm. On average, June sees 104 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 June, 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 June specifically, along with year-by-year records and how the month has changed over the decades.
