July is one of the warmer months of the year in Harrisburg, with average highs near 29.7°C and lows around 17.7°C (mean 23.7°C). It is a relatively wet time of year, averaging 110 mm of rainfall and 70% relative humidity across the period.
July is one of the warmer months of the year in Harrisburg. Across 45 years of records, the warmest Julys in Harrisburg were 1999 and 2020 — when the month averaged 26.2°C — while the coldest was 1984 at 20.5°C. Typical July days reach 29.7°C with nights near 17.7°C. The long-term trend is warming, about 0.5°C per decade.
July is a relatively wet time of year in Harrisburg, averaging 110 mm of rainfall. The wettest July on record was 2018 with 269 mm, while the driest was 2002 at 39 mm.
Relative humidity in Harrisburg during July averages 70%. The most humid July was 1989 at 82%, and the least humid was 1999 at 54%.
July receives about 5.9 kWh/m²/day of solar energy in Harrisburg. The sunniest July was 2011 at 6.6 kWh/m²/day, and the cloudiest were 1984 and 2004 at 5.1.
Average wind speed in Harrisburg 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 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 | 23.0°C | 23.5°C | 22.9°C | 24.3°C | 25.3°C | +2.3°C |
| Avg High | 29.1°C | 29.6°C | 28.8°C | 30.2°C | 31.4°C | +2.3°C |
| Avg Low | 16.9°C | 17.4°C | 16.9°C | 18.5°C | 19.2°C | +2.3°C |
| Avg Rain | 108 mm | 97 mm | 105 mm | 127 mm | 114 mm | +6 mm |
July temperatures in Harrisburg 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°C (2010).
Rainfall in July is a relatively wet time of year, averaging 110 mm, with a wettest year of 269 mm.
One of the best times to visit Harrisburg
July is one of the best times to visit Harrisburg. Expect days averaging 29.7°C and nights around 17.7°C (mean 23.7°C) — warmer than Harrisburg's yearly average — with higher rainfall (110 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 | 31.6°C | 25.7°C | 19.8°C | 37.0°C | 15.3°C | 116 mm | 71% | 0.4 m/s | 5.9 |
| 2024 | 31.9°C | 25.8°C | 19.6°C | 37.4°C | 13.2°C | 105 mm | 65% | 0.4 m/s | 6 |
| 2023 | 30.6°C | 24.8°C | 18.9°C | 35.7°C | 15.4°C | 158 mm | 72% | 0.4 m/s | 5.9 |
| 2022 | 32.0°C | 25.5°C | 18.9°C | 37.0°C | 14.0°C | 64 mm | 62% | 0.4 m/s | 5.9 |
| 2021 | 29.8°C | 24.0°C | 18.2°C | 35.1°C | 11.6°C | 153 mm | 71% | 0.4 m/s | 5.7 |
| 2020 | 32.6°C | 26.2°C | 19.8°C | 36.4°C | 16.2°C | 89 mm | 66% | 0.4 m/s | 6.3 |
| 2019 | 30.2°C | 24.7°C | 19.2°C | 35.8°C | 13.4°C | 115 mm | 76% | 0.4 m/s | 6.3 |
| 2018 🌧️ | 28.4°C | 23.0°C | 17.7°C | 34.2°C | 12.4°C | 269 mm | 77% | 0.4 m/s | 6 |
| 2017 | 29.4°C | 23.7°C | 18.1°C | 33.9°C | 12.6°C | 172 mm | 74% | 0.4 m/s | 5.6 |
| 2016 | 32.3°C | 25.7°C | 19.1°C | 36.6°C | 13.2°C | 85 mm | 61% | 0.4 m/s | 6.2 |
| 2015 | 28.9°C | 23.1°C | 17.3°C | 34.3°C | 11.0°C | 101 mm | 72% | 0.4 m/s | 6 |
| 2014 | 28.1°C | 22.4°C | 16.6°C | 33.7°C | 11.4°C | 117 mm | 72% | 0.4 m/s | 6 |
| 2013 | 29.6°C | 24.5°C | 19.4°C | 36.2°C | 12.5°C | 100 mm | 74% | 0.4 m/s | 5.8 |
| 2012 | 32.0°C | 25.8°C | 19.6°C | 38.2°C | 15.8°C | 110 mm | 64% | 0.4 m/s | 6 |
| 2011 | 31.0°C | 25.0°C | 18.9°C | 37.4°C | 12.4°C | 69 mm | 70% | 0.4 m/s | 6.6 |
| 2010 | 32.1°C | 25.5°C | 18.8°C | 39.0°C | 10.8°C | 129 mm | 62% | 0.4 m/s | 6.5 |
| 2009 | 26.6°C | 21.1°C | 15.6°C | 31.4°C | 10.5°C | 126 mm | 73% | 0.4 m/s | 5.9 |
| 2008 | 29.5°C | 23.7°C | 17.8°C | 34.5°C | 13.3°C | 106 mm | 70% | 0.4 m/s | 6 |
| 2007 | 29.7°C | 23.2°C | 16.6°C | 35.7°C | 9.7°C | 82 mm | 62% | 0.4 m/s | 6 |
| 2006 | 28.8°C | 23.6°C | 18.4°C | 35.1°C | 12.5°C | 99 mm | 80% | 0.4 m/s | 6 |
| 2005 | 30.2°C | 24.3°C | 18.4°C | 34.2°C | 13.8°C | 144 mm | 72% | 0.4 m/s | 5.8 |
| 2004 | 27.0°C | 22.0°C | 16.9°C | 31.6°C | 13.6°C | 197 mm | 81% | 0.4 m/s | 5.1 |
| 2003 | 27.1°C | 21.9°C | 16.8°C | 29.7°C | 12.9°C | 117 mm | 80% | 0.4 m/s | 5.9 |
| 2002 | 32.1°C | 25.1°C | 18.2°C | 36.7°C | 10.7°C | 39 mm | 58% | 0.4 m/s | 6.2 |
| 2001 | 29.5°C | 22.5°C | 15.5°C | 36.4°C | 9.8°C | 60 mm | 57% | 0.4 m/s | 6.3 |
| 2000 | 27.7°C | 21.5°C | 15.2°C | 31.7°C | 10.2°C | 81 mm | 66% | 0.4 m/s | 5.4 |
| 1999 🔥 | 33.5°C | 26.2°C | 19.0°C | 38.7°C | 12.0°C | 41 mm | 54% | 0.4 m/s | 6 |
| 1998 | 27.6°C | 21.9°C | 16.1°C | 31.7°C | 11.3°C | 63 mm | 73% | 0.4 m/s | 5.8 |
| 1997 | 30.3°C | 23.3°C | 16.3°C | 36.7°C | 10.7°C | 94 mm | 60% | 0.4 m/s | 6.2 |
| 1996 | 25.9°C | 20.7°C | 15.5°C | 30.4°C | 9.8°C | 154 mm | 81% | 0.4 m/s | 5.5 |
| 1995 | 30.0°C | 24.0°C | 18.1°C | 35.7°C | 9.8°C | 100 mm | 71% | 0.4 m/s | 5.6 |
| 1994 | 29.2°C | 23.8°C | 18.3°C | 34.0°C | 13.6°C | 143 mm | 75% | 0.4 m/s | 5.5 |
| 1993 | 30.7°C | 24.4°C | 18.2°C | 35.3°C | 13.4°C | 77 mm | 65% | 0.4 m/s | 5.9 |
| 1992 | 27.8°C | 22.5°C | 17.2°C | 33.0°C | 11.5°C | 136 mm | 75% | 0.4 m/s | 5.7 |
| 1991 | 31.7°C | 24.8°C | 18.0°C | 37.8°C | 13.9°C | 66 mm | 58% | 0.4 m/s | 5.8 |
| 1990 | 29.2°C | 23.0°C | 16.9°C | 35.3°C | 11.5°C | 102 mm | 72% | 0.4 m/s | 5.4 |
| 1989 | 26.6°C | 21.9°C | 17.3°C | 30.7°C | 11.9°C | 160 mm | 82% | 0.4 m/s | 5.4 |
| 1988 | 32.6°C | 25.5°C | 18.5°C | 38.8°C | 8.8°C | 140 mm | 61% | 0.4 m/s | 5.8 |
| 1987 | 31.4°C | 24.9°C | 18.5°C | 37.6°C | 11.5°C | 79 mm | 66% | 0.4 m/s | 6.1 |
| 1986 | 30.1°C | 23.7°C | 17.4°C | 35.3°C | 10.7°C | 133 mm | 70% | 0.4 m/s | 5.7 |
| 1985 | 29.3°C | 22.7°C | 16.0°C | 33.3°C | 10.8°C | 123 mm | 67% | 0.4 m/s | 6.2 |
| 1984 ❄️ | 25.5°C | 20.5°C | 15.4°C | 29.8°C | 9.2°C | 120 mm | 82% | 0.4 m/s | 5.1 |
| 1983 | 29.4°C | 22.9°C | 16.4°C | 34.4°C | 9.0°C | 41 mm | 70% | 0.4 m/s | — |
| 1982 | 28.0°C | 22.1°C | 16.1°C | 33.0°C | 8.3°C | 73 mm | 74% | 0.4 m/s | — |
| 1981 | 29.0°C | 22.6°C | 16.2°C | 33.9°C | 10.3°C | 103 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 29.7°C with lows near 17.7°C (mean 23.7°C), based on 45 years of NASA POWER data.
July averages 110 mm of rainfall in Harrisburg, a relatively wet time of year. The wettest on record was 269 mm in 2018.
The hottest July reached 39°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 28.2°C to 31.2°C and overnight lows from 16°C to 19.1°C over the same span.
July is one of the warmer months of the year in Harrisburg and a relatively wet time of year, so plan for around 29.7°C daytime highs and 17.7°C at night.
Not quite — July is the 12th coolest month in Harrisburg, averaging 23.7°C.
For July in Harrisburg, pack light layers you can adjust through the day, with typical highs of 29.7°C and lows of 17.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 70% — 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 2018 with 269 mm. On average, July sees 110 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 Harrisburg 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.
