June is one of the warmer months of the year in Allentown, with average highs near 26.1°C and lows around 14.6°C (mean 20.4°C). It is a relatively wet time of year, averaging 112 mm of rainfall and 77% relative humidity across the period.
June is one of the warmer months of the year in Allentown. Across 45 years of records, the warmest June in Allentown was 2010 — when the month averaged 22.6°C — while the coldest was 1982 at 17.7°C. Typical June days reach 26.1°C with nights near 14.6°C. The long-term trend is warming, about 0.4°C per decade.
June is a relatively wet time of year in Allentown, averaging 112 mm of rainfall. The wettest June on record was 2006 with 303 mm, while the driest was 1988 at 29 mm.
Relative humidity in Allentown during June averages 77%. The most humid June was 1989 at 84%, and the least humid was 1999 at 62%.
June receives about 5.9 kWh/m²/day of solar energy in Allentown. The sunniest June was 1988 at 7.1 kWh/m²/day, and the cloudiest was 2003 at 4.8.
Average wind speed in Allentown during June is 0.4 m/s. The windiest Junes were 1985 and 2000 at 0.5 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.4°C | 20.0°C | 20.6°C | 20.7°C | 21.0°C | +1.6°C |
| Avg High | 25.2°C | 26.0°C | 26.3°C | 26.3°C | 26.8°C | +1.6°C |
| Avg Low | 13.6°C | 14.0°C | 15.0°C | 15.2°C | 15.2°C | +1.6°C |
| Avg Rain | 115 mm | 91 mm | 138 mm | 116 mm | 93 mm | -23 mm |
June temperatures in Allentown have risen by about 2°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 2.7°C (1986) to a record high of 36°C (2024).
Rainfall in June is a relatively wet time of year, averaging 112 mm, with a wettest year of 303 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 Allentown
June is one of the best times to visit Allentown. Expect days averaging 26.1°C and nights around 14.6°C (mean 20.4°C) — warmer than Allentown's yearly average — with higher rainfall (112 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 | 21.8°C | 16.1°C | 35.9°C | 6.0°C | 83 mm | 80% | 0.4 m/s | 5.4 |
| 2024 | 28.5°C | 22.3°C | 16.1°C | 36.0°C | 9.8°C | 78 mm | 73% | 0.4 m/s | 6.4 |
| 2023 | 25.8°C | 19.8°C | 13.7°C | 33.6°C | 8.8°C | 136 mm | 71% | 0.4 m/s | 5.4 |
| 2022 | 25.8°C | 20.1°C | 14.4°C | 31.4°C | 8.1°C | 100 mm | 76% | 0.4 m/s | 6.2 |
| 2021 | 27.0°C | 21.4°C | 15.8°C | 35.5°C | 9.1°C | 84 mm | 77% | 0.4 m/s | 5.9 |
| 2020 | 26.4°C | 20.7°C | 15.0°C | 31.0°C | 5.2°C | 76 mm | 76% | 0.4 m/s | 6.5 |
| 2019 | 25.3°C | 20.0°C | 14.7°C | 32.7°C | 6.1°C | 137 mm | 80% | 0.4 m/s | 6.1 |
| 2018 | 25.5°C | 20.2°C | 14.9°C | 33.4°C | 9.5°C | 101 mm | 80% | 0.4 m/s | 6 |
| 2017 | 26.4°C | 20.6°C | 14.9°C | 33.5°C | 9.3°C | 104 mm | 75% | 0.4 m/s | 6.1 |
| 2016 | 26.9°C | 20.8°C | 14.8°C | 32.1°C | 6.8°C | 68 mm | 70% | 0.4 m/s | 6.5 |
| 2015 | 26.1°C | 20.9°C | 15.6°C | 30.8°C | 9.6°C | 191 mm | 81% | 0.4 m/s | 5.2 |
| 2014 | 25.6°C | 20.4°C | 15.1°C | 29.9°C | 9.2°C | 107 mm | 81% | 0.4 m/s | 6.2 |
| 2013 | 25.9°C | 20.6°C | 15.3°C | 31.1°C | 8.3°C | 205 mm | 81% | 0.4 m/s | 5.8 |
| 2012 | 26.2°C | 20.2°C | 14.3°C | 34.6°C | 8.3°C | 91 mm | 74% | 0.4 m/s | 6.1 |
| 2011 | 26.2°C | 20.9°C | 15.6°C | 30.6°C | 8.4°C | 86 mm | 81% | 0.4 m/s | 5.8 |
| 2010 🔥 | 28.7°C | 22.6°C | 16.6°C | 33.7°C | 9.9°C | 65 mm | 71% | 0.4 m/s | 6 |
| 2009 | 24.3°C | 19.6°C | 14.9°C | 28.3°C | 6.0°C | 161 mm | 84% | 0.4 m/s | 4.9 |
| 2008 | 27.5°C | 21.8°C | 16.1°C | 32.7°C | 9.6°C | 68 mm | 78% | 0.4 m/s | 6.3 |
| 2007 | 26.7°C | 20.7°C | 14.7°C | 34.0°C | 9.0°C | 112 mm | 76% | 0.4 m/s | 6.1 |
| 2006 🌧️ | 25.6°C | 20.4°C | 15.2°C | 33.8°C | 7.0°C | 303 mm | 78% | 0.4 m/s | 5.4 |
| 2005 | 27.8°C | 22.0°C | 16.2°C | 35.0°C | 9.7°C | 67 mm | 78% | 0.4 m/s | 5.9 |
| 2004 | 24.9°C | 19.4°C | 13.9°C | 30.3°C | 8.3°C | 107 mm | 80% | 0.4 m/s | 5.8 |
| 2003 | 24.3°C | 19.1°C | 13.9°C | 33.3°C | 5.5°C | 204 mm | 84% | 0.4 m/s | 4.8 |
| 2002 | 27.5°C | 21.3°C | 15.2°C | 34.5°C | 9.3°C | 108 mm | 71% | 0.4 m/s | 5.9 |
| 2001 | 28.0°C | 21.5°C | 15.0°C | 33.4°C | 5.2°C | 114 mm | 70% | 0.4 m/s | 6.2 |
| 2000 | 25.9°C | 20.3°C | 14.8°C | 30.6°C | 7.6°C | 137 mm | 81% | 0.5 m/s | 5.1 |
| 1999 | 28.9°C | 21.9°C | 14.9°C | 35.3°C | 9.5°C | 47 mm | 62% | 0.4 m/s | 6 |
| 1998 | 24.2°C | 19.2°C | 14.3°C | 29.9°C | 6.4°C | 149 mm | 81% | 0.4 m/s | 5.3 |
| 1997 | 26.4°C | 20.1°C | 13.8°C | 34.4°C | 8.5°C | 69 mm | 72% | 0.4 m/s | 6 |
| 1996 | 25.3°C | 19.8°C | 14.4°C | 29.6°C | 6.8°C | 151 mm | 83% | 0.4 m/s | 5.6 |
| 1995 | 26.7°C | 20.4°C | 14.1°C | 34.0°C | 9.4°C | 87 mm | 73% | 0.4 m/s | 5.5 |
| 1994 | 26.7°C | 20.9°C | 15.0°C | 31.4°C | 6.6°C | 126 mm | 79% | 0.4 m/s | 5.7 |
| 1993 | 25.3°C | 19.4°C | 13.4°C | 29.8°C | 4.5°C | 70 mm | 77% | 0.4 m/s | 6.4 |
| 1992 | 24.0°C | 18.1°C | 12.2°C | 29.4°C | 5.4°C | 81 mm | 77% | 0.4 m/s | 6.5 |
| 1991 | 27.9°C | 21.2°C | 14.5°C | 35.9°C | 8.4°C | 52 mm | 67% | 0.4 m/s | 6.2 |
| 1990 | 24.9°C | 19.3°C | 13.8°C | 28.9°C | 6.1°C | 77 mm | 80% | 0.4 m/s | 5.7 |
| 1989 | 25.0°C | 20.3°C | 15.7°C | 31.2°C | 9.0°C | 169 mm | 84% | 0.4 m/s | 5 |
| 1988 | 25.5°C | 19.0°C | 12.5°C | 34.6°C | 5.0°C | 29 mm | 68% | 0.4 m/s | 7.1 |
| 1987 | 26.8°C | 20.9°C | 15.1°C | 31.6°C | 7.0°C | 79 mm | 75% | 0.4 m/s | 6 |
| 1986 | 25.5°C | 19.1°C | 12.7°C | 31.6°C | 2.7°C | 79 mm | 73% | 0.4 m/s | 6.5 |
| 1985 | 24.9°C | 18.6°C | 12.3°C | 29.5°C | 7.4°C | 94 mm | 71% | 0.5 m/s | 5.7 |
| 1984 | 25.2°C | 19.7°C | 14.2°C | 31.1°C | 5.1°C | 152 mm | 82% | 0.4 m/s | 5.6 |
| 1983 | 25.2°C | 19.2°C | 13.2°C | 29.9°C | 5.5°C | 115 mm | 80% | 0.4 m/s | — |
| 1982 ❄️ | 23.0°C | 17.7°C | 12.5°C | 27.6°C | 8.1°C | 185 mm | 82% | 0.4 m/s | — |
| 1981 | 26.0°C | 20.1°C | 14.2°C | 31.9°C | 8.7°C | 136 mm | 76% | 0.4 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 26.1°C with lows near 14.6°C (mean 20.4°C), based on 45 years of NASA POWER data.
June averages 112 mm of rainfall in Allentown, a relatively wet time of year. The wettest on record was 303 mm in 2006.
The hottest June reached 36°C in 2024. The coldest dipped to 2.7°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 24.9°C to 26.9°C and overnight lows from 13.3°C to 15.2°C over the same span.
June is one of the warmer months of the year in Allentown and a relatively wet time of year, so plan for around 26.1°C daytime highs and 14.6°C at night.
Not quite — June is the 10th coolest month in Allentown, averaging 20.4°C.
For June in Allentown, pack light layers you can adjust through the day, with typical highs of 26.1°C and lows of 14.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in June averages 77% — quite humid.
Average wind speed in June is 0.4 m/s. The windiest June on record averaged 0.5 m/s (1985).
The wettest June on record was 2006 with 303 mm. On average, June sees 112 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 Allentown 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.
