July is one of the warmer months of the year in Allentown, with average highs near 29.4°C and lows around 17.8°C (mean 23.6°C). It is a relatively wet time of year, averaging 121 mm of rainfall and 72% relative humidity across the period.
July is one of the warmer months of the year in Allentown. Across 45 years of records, the warmest July in Allentown was 1999 — when the month averaged 26.6°C — while the coldest was 1984 at 20.5°C. Typical July days reach 29.4°C with nights near 17.8°C. The long-term trend is warming, about 0.5°C per decade.
July is a relatively wet time of year in Allentown, averaging 121 mm of rainfall. The wettest July on record was 2004 with 220 mm, while the driest was 1999 at 26 mm.
Relative humidity in Allentown during July averages 72%. The most humid July was 1984 at 84%, and the least humid was 1999 at 52%.
July receives about 5.8 kWh/m²/day of solar energy in Allentown. The sunniest Julys were 2010 and 2011 at 6.4 kWh/m²/day, and the cloudiest were 1984, 1989 and 2004 at 5.2.
Average wind speed in Allentown during July is 0.4 m/s. The windiest Julys were 2023, 2024 and 2025, among others at 0.4 m/s, while the calmest was 1987 at 0.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 22.8°C | 23.4°C | 22.9°C | 24.3°C | 25.1°C | +2.3°C |
| Avg High | 28.7°C | 29.4°C | 28.7°C | 30.0°C | 30.9°C | +2.2°C |
| Avg Low | 16.8°C | 17.4°C | 17.2°C | 18.6°C | 19.4°C | +2.6°C |
| Avg Rain | 128 mm | 106 mm | 113 mm | 133 mm | 130 mm | +2 mm |
July temperatures in Allentown have risen by about 3°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 8.3°C (1982) to a record high of 39.9°C (2010).
Rainfall in July is a relatively wet time of year, averaging 121 mm, with a wettest year of 220 mm.
One of the best times to visit Allentown
July is one of the best times to visit Allentown. Expect days averaging 29.4°C and nights around 17.8°C (mean 23.6°C) — warmer than Allentown's yearly average — with higher rainfall (121 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 | 31.2°C | 25.5°C | 19.8°C | 37.6°C | 15.4°C | 135 mm | 74% | 0.4 m/s | 5.8 |
| 2024 | 31.7°C | 25.8°C | 20.0°C | 36.4°C | 14.4°C | 103 mm | 69% | 0.4 m/s | 5.7 |
| 2023 | 29.6°C | 24.3°C | 18.9°C | 33.3°C | 15.4°C | 182 mm | 78% | 0.4 m/s | 5.7 |
| 2022 | 31.9°C | 25.5°C | 19.2°C | 37.1°C | 13.8°C | 55 mm | 65% | 0.4 m/s | 6 |
| 2021 | 29.5°C | 23.9°C | 18.4°C | 34.0°C | 11.2°C | 157 mm | 75% | 0.4 m/s | 5.6 |
| 2020 | 31.4°C | 25.7°C | 19.9°C | 34.8°C | 16.8°C | 150 mm | 71% | 0.4 m/s | 6.2 |
| 2019 | 29.5°C | 24.4°C | 19.3°C | 32.8°C | 13.8°C | 174 mm | 80% | 0.4 m/s | 6.3 |
| 2018 | 28.9°C | 23.6°C | 18.2°C | 34.9°C | 12.9°C | 178 mm | 75% | 0.4 m/s | 6.1 |
| 2017 | 28.9°C | 23.6°C | 18.3°C | 32.9°C | 13.2°C | 158 mm | 76% | 0.4 m/s | 5.6 |
| 2016 | 31.8°C | 25.4°C | 19.0°C | 36.6°C | 13.8°C | 160 mm | 66% | 0.4 m/s | 6 |
| 2015 | 29.5°C | 23.5°C | 17.5°C | 34.8°C | 12.2°C | 96 mm | 72% | 0.4 m/s | 6 |
| 2014 | 28.0°C | 22.4°C | 16.8°C | 31.7°C | 12.5°C | 131 mm | 75% | 0.4 m/s | 6.2 |
| 2013 | 28.8°C | 24.1°C | 19.4°C | 36.6°C | 13.2°C | 125 mm | 80% | 0.4 m/s | 5.7 |
| 2012 | 31.9°C | 25.8°C | 19.7°C | 37.6°C | 16.0°C | 95 mm | 64% | 0.4 m/s | 5.9 |
| 2011 | 31.1°C | 25.1°C | 19.2°C | 37.2°C | 12.7°C | 80 mm | 69% | 0.4 m/s | 6.4 |
| 2010 | 31.5°C | 25.2°C | 18.9°C | 39.9°C | 11.4°C | 136 mm | 65% | 0.4 m/s | 6.4 |
| 2009 | 26.1°C | 20.8°C | 15.6°C | 30.0°C | 10.7°C | 136 mm | 78% | 0.4 m/s | 5.8 |
| 2008 | 30.2°C | 24.3°C | 18.4°C | 34.7°C | 14.8°C | 119 mm | 69% | 0.4 m/s | 5.9 |
| 2007 | 29.1°C | 23.0°C | 16.8°C | 34.8°C | 9.5°C | 94 mm | 68% | 0.4 m/s | 6 |
| 2006 | 28.2°C | 23.5°C | 18.8°C | 31.9°C | 12.8°C | 124 mm | 83% | 0.4 m/s | 6 |
| 2005 | 30.1°C | 24.3°C | 18.5°C | 35.1°C | 14.2°C | 136 mm | 73% | 0.4 m/s | 5.8 |
| 2004 🌧️ | 27.2°C | 22.1°C | 17.1°C | 30.8°C | 13.9°C | 220 mm | 81% | 0.4 m/s | 5.2 |
| 2003 | 27.1°C | 22.2°C | 17.4°C | 29.9°C | 13.9°C | 108 mm | 81% | 0.4 m/s | 5.9 |
| 2002 | 32.3°C | 25.3°C | 18.3°C | 36.7°C | 11.5°C | 28 mm | 57% | 0.4 m/s | 6.2 |
| 2001 | 29.2°C | 22.4°C | 15.6°C | 35.6°C | 10.8°C | 74 mm | 61% | 0.4 m/s | 6.3 |
| 2000 | 27.1°C | 21.2°C | 15.4°C | 30.9°C | 10.4°C | 90 mm | 70% | 0.4 m/s | 5.5 |
| 1999 🔥 | 33.9°C | 26.6°C | 19.4°C | 39.1°C | 13.0°C | 26 mm | 52% | 0.4 m/s | 6.1 |
| 1998 | 27.6°C | 22.0°C | 16.3°C | 32.1°C | 11.7°C | 57 mm | 74% | 0.4 m/s | 5.8 |
| 1997 | 30.2°C | 23.2°C | 16.3°C | 37.5°C | 11.1°C | 118 mm | 61% | 0.4 m/s | 6.3 |
| 1996 | 25.7°C | 20.8°C | 15.9°C | 29.6°C | 10.5°C | 178 mm | 82% | 0.4 m/s | 5.3 |
| 1995 | 29.6°C | 23.9°C | 18.1°C | 35.5°C | 10.6°C | 120 mm | 72% | 0.4 m/s | 5.5 |
| 1994 | 29.1°C | 23.9°C | 18.7°C | 33.9°C | 13.8°C | 137 mm | 76% | 0.4 m/s | 5.6 |
| 1993 | 30.6°C | 24.3°C | 17.9°C | 35.2°C | 12.6°C | 85 mm | 66% | 0.4 m/s | 6 |
| 1992 | 27.6°C | 22.2°C | 16.7°C | 32.4°C | 12.0°C | 135 mm | 76% | 0.4 m/s | 5.8 |
| 1991 | 30.8°C | 24.3°C | 17.8°C | 36.5°C | 14.0°C | 103 mm | 63% | 0.4 m/s | 5.7 |
| 1990 | 28.5°C | 22.8°C | 17.1°C | 33.8°C | 11.7°C | 96 mm | 76% | 0.4 m/s | 5.4 |
| 1989 | 26.7°C | 21.8°C | 16.9°C | 30.9°C | 12.4°C | 150 mm | 83% | 0.4 m/s | 5.2 |
| 1988 | 31.1°C | 24.9°C | 18.6°C | 37.8°C | 8.4°C | 204 mm | 67% | 0.4 m/s | 5.6 |
| 1987 | 30.8°C | 24.5°C | 18.2°C | 36.1°C | 11.7°C | 116 mm | 70% | 0.3 m/s | 6.1 |
| 1986 | 29.9°C | 23.5°C | 17.2°C | 35.3°C | 9.1°C | 138 mm | 71% | 0.4 m/s | 5.5 |
| 1985 | 29.3°C | 22.9°C | 16.4°C | 32.9°C | 11.7°C | 145 mm | 67% | 0.4 m/s | 6.1 |
| 1984 ❄️ | 25.4°C | 20.5°C | 15.7°C | 29.0°C | 9.7°C | 175 mm | 84% | 0.4 m/s | 5.2 |
| 1983 | 28.8°C | 22.5°C | 16.2°C | 33.3°C | 9.6°C | 40 mm | 73% | 0.4 m/s | — |
| 1982 | 27.3°C | 21.5°C | 15.7°C | 31.5°C | 8.3°C | 82 mm | 78% | 0.4 m/s | — |
| 1981 | 29.1°C | 22.8°C | 16.4°C | 33.7°C | 10.9°C | 104 mm | 68% | 0.4 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 29.4°C with lows near 17.8°C (mean 23.6°C), based on 45 years of NASA POWER data.
July averages 121 mm of rainfall in Allentown, a relatively wet time of year. The wettest on record was 220 mm in 2004.
The hottest July reached 39.9°C in 2010. The coldest dipped to 8.3°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 3°C. Daytime highs moved from 28°C to 30.8°C and overnight lows from 16.1°C to 19.3°C over the same span.
July is one of the warmer months of the year in Allentown and a relatively wet time of year, so plan for around 29.4°C daytime highs and 17.8°C at night.
Not quite — July is the 12th coolest month in Allentown, averaging 23.6°C.
For July in Allentown, pack light layers you can adjust through the day, with typical highs of 29.4°C and lows of 17.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 72% — moderately humid.
Average wind speed in July is 0.4 m/s. The windiest July on record averaged 0.4 m/s (1981).
The wettest July on record was 2004 with 220 mm. On average, July sees 121 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 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.
