October is one of the warmer months of the year in Harrisburg, with average highs near 17.8°C and lows around 6.1°C (mean 12°C). It is about average for rainfall, averaging 92 mm of rainfall and 76% relative humidity across the period.
October is one of the warmer months of the year in Harrisburg. Across 45 years of records, the warmest October in Harrisburg was 2007 — when the month averaged 15.8°C — while the coldest was 1987 at 8.4°C. Typical October days reach 17.8°C with nights near 6.1°C. The long-term trend is warming, about 0.5°C per decade.
October is about average for rainfall in Harrisburg, averaging 92 mm of rainfall. The wettest October on record was 2005 with 201 mm, while the driest was 2024 at 15 mm.
Relative humidity in Harrisburg during October averages 76%. The most humid October was 2021 at 85%, and the least humid was 2001 at 65%.
October receives about 3.1 kWh/m²/day of solar energy in Harrisburg. The sunniest October was 2024 at 3.8 kWh/m²/day, and the cloudiest were 2009 and 2012 at 2.5.
Average wind speed in Harrisburg during October is 0.5 m/s. The windiest Octobers were 2022, 2023 and 2025, among others at 0.5 m/s, while the calmest were 2018, 2021 and 2024, 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 | 11.3°C | 11.3°C | 11.7°C | 12.7°C | 13.3°C | +2°C |
| Avg High | 17.4°C | 17.4°C | 17.3°C | 18.2°C | 19.3°C | +1.9°C |
| Avg Low | 5.3°C | 5.2°C | 6.0°C | 7.1°C | 7.3°C | +2°C |
| Avg Rain | 74 mm | 90 mm | 105 mm | 108 mm | 75 mm | +1 mm |
October temperatures in Harrisburg have risen by about 1.2°C between 1981–1985 and 2021–2025.
October has ranged from a record low of -5°C (1992) to a record high of 34.2°C (2019).
Rainfall in October is about average for rainfall, averaging 92 mm, with a wettest year of 201 mm.
A good time to visit Harrisburg
October is a good time to visit Harrisburg, with days averaging 17.8°C and nights around 6.1°C (mean 12°C, warmer than Harrisburg's yearly average) and higher rainfall. August and June are marginally more temperate, but October still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 19.4°C | 13.0°C | 6.6°C | 29.5°C | 0.9°C | 89 mm | 68% | 0.5 m/s | 3.4 |
| 2024 | 20.7°C | 13.6°C | 6.5°C | 28.2°C | 0.6°C | 15 mm | 68% | 0.4 m/s | 3.8 |
| 2023 | 19.5°C | 13.6°C | 7.7°C | 28.6°C | 1.4°C | 65 mm | 75% | 0.5 m/s | 3.1 |
| 2022 | 17.2°C | 11.3°C | 5.4°C | 24.2°C | 0.3°C | 92 mm | 76% | 0.5 m/s | 3 |
| 2021 | 20.2°C | 15.2°C | 10.3°C | 26.7°C | 3.3°C | 92 mm | 85% | 0.4 m/s | 2.6 |
| 2020 | 18.9°C | 13.1°C | 7.4°C | 27.6°C | -1.9°C | 96 mm | 74% | 0.5 m/s | 2.8 |
| 2019 | 20.3°C | 14.2°C | 8.1°C | 34.2°C | 0.8°C | 121 mm | 72% | 0.5 m/s | 2.9 |
| 2018 | 17.0°C | 12.1°C | 7.2°C | 28.3°C | -1.5°C | 93 mm | 85% | 0.4 m/s | 2.8 |
| 2017 | 21.3°C | 15.2°C | 9.0°C | 28.0°C | 0.7°C | 139 mm | 74% | 0.5 m/s | 3.2 |
| 2016 | 19.2°C | 13.2°C | 7.2°C | 28.1°C | -1.4°C | 49 mm | 75% | 0.5 m/s | 3.2 |
| 2015 | 17.5°C | 11.7°C | 5.9°C | 25.2°C | -2.0°C | 96 mm | 75% | 0.5 m/s | 3.2 |
| 2014 | 18.4°C | 12.9°C | 7.5°C | 25.3°C | 2.0°C | 93 mm | 75% | 0.5 m/s | 2.7 |
| 2013 | 18.5°C | 13.0°C | 7.4°C | 30.2°C | -1.6°C | 141 mm | 79% | 0.4 m/s | 3 |
| 2012 | 17.6°C | 12.5°C | 7.5°C | 25.8°C | -2.2°C | 153 mm | 82% | 0.5 m/s | 2.5 |
| 2011 | 15.8°C | 10.8°C | 5.9°C | 28.1°C | -3.5°C | 121 mm | 84% | 0.5 m/s | 2.7 |
| 2010 | 16.7°C | 11.2°C | 5.7°C | 24.8°C | -0.6°C | 77 mm | 81% | 0.5 m/s | 3.2 |
| 2009 | 15.6°C | 10.7°C | 5.7°C | 24.3°C | -2.1°C | 147 mm | 81% | 0.5 m/s | 2.5 |
| 2008 | 16.4°C | 10.4°C | 4.5°C | 26.1°C | -3.3°C | 66 mm | 75% | 0.5 m/s | 3.4 |
| 2007 🔥 | 21.8°C | 15.8°C | 9.9°C | 32.0°C | -0.6°C | 115 mm | 75% | 0.4 m/s | 3.2 |
| 2006 | 16.4°C | 10.8°C | 5.2°C | 26.1°C | -1.4°C | 109 mm | 78% | 0.5 m/s | 3 |
| 2005 🌧️ | 17.6°C | 12.6°C | 7.7°C | 28.0°C | 0.1°C | 201 mm | 81% | 0.5 m/s | 2.6 |
| 2004 | 16.2°C | 11.2°C | 6.2°C | 22.7°C | 0.6°C | 65 mm | 83% | 0.4 m/s | 2.9 |
| 2003 | 15.7°C | 10.0°C | 4.4°C | 23.8°C | -2.7°C | 120 mm | 81% | 0.5 m/s | 3.1 |
| 2002 | 15.4°C | 10.6°C | 5.7°C | 28.2°C | -3.5°C | 157 mm | 83% | 0.4 m/s | 2.6 |
| 2001 | 18.9°C | 12.3°C | 5.6°C | 27.1°C | -0.9°C | 29 mm | 65% | 0.5 m/s | 3.7 |
| 2000 | 18.9°C | 12.2°C | 5.5°C | 27.1°C | -1.3°C | 44 mm | 71% | 0.5 m/s | 3.3 |
| 1999 | 16.3°C | 10.2°C | 4.1°C | 22.6°C | -0.9°C | 57 mm | 81% | 0.4 m/s | 3.2 |
| 1998 | 17.8°C | 11.9°C | 6.1°C | 23.3°C | -0.2°C | 85 mm | 74% | 0.4 m/s | 3 |
| 1997 | 18.1°C | 11.6°C | 5.1°C | 28.5°C | -2.4°C | 39 mm | 70% | 0.4 m/s | 3.4 |
| 1996 | 16.5°C | 10.8°C | 5.0°C | 23.4°C | -0.5°C | 136 mm | 82% | 0.5 m/s | 3.1 |
| 1995 | 19.8°C | 13.4°C | 7.0°C | 27.9°C | 0.1°C | 188 mm | 76% | 0.5 m/s | 3.1 |
| 1994 | 16.8°C | 10.4°C | 4.0°C | 23.6°C | -0.4°C | 27 mm | 76% | 0.4 m/s | 3.4 |
| 1993 | 15.7°C | 9.9°C | 4.2°C | 23.4°C | -2.5°C | 86 mm | 78% | 0.5 m/s | 3.1 |
| 1992 | 16.0°C | 9.9°C | 3.7°C | 24.7°C | -5.0°C | 48 mm | 75% | 0.5 m/s | 2.9 |
| 1991 | 18.6°C | 12.1°C | 5.6°C | 27.6°C | -2.6°C | 65 mm | 74% | 0.5 m/s | 3.2 |
| 1990 | 18.8°C | 13.1°C | 7.4°C | 27.4°C | -4.3°C | 173 mm | 78% | 0.5 m/s | 3.2 |
| 1989 | 18.3°C | 12.1°C | 5.8°C | 27.3°C | -0.6°C | 127 mm | 78% | 0.5 m/s | 3 |
| 1988 | 14.6°C | 8.9°C | 3.1°C | 25.9°C | -4.3°C | 52 mm | 70% | 0.5 m/s | 3 |
| 1987 ❄️ | 14.5°C | 8.4°C | 2.4°C | 20.3°C | -3.3°C | 65 mm | 77% | 0.5 m/s | 3.3 |
| 1986 | 17.9°C | 11.8°C | 5.8°C | 26.7°C | -1.3°C | 64 mm | 76% | 0.4 m/s | 3.2 |
| 1985 | 18.5°C | 12.3°C | 6.1°C | 25.8°C | -3.9°C | 44 mm | 76% | 0.4 m/s | 2.9 |
| 1984 | 20.9°C | 14.8°C | 8.6°C | 26.2°C | 1.7°C | 63 mm | 76% | 0.4 m/s | 2.9 |
| 1983 | 17.9°C | 11.9°C | 6.0°C | 28.7°C | -4.1°C | 110 mm | 74% | 0.4 m/s | — |
| 1982 | 18.2°C | 12.0°C | 5.8°C | 27.2°C | -4.1°C | 38 mm | 71% | 0.4 m/s | — |
| 1981 | 15.8°C | 9.7°C | 3.7°C | 24.0°C | -2.5°C | 100 mm | 72% | 0.5 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 17.8°C with lows near 6.1°C (mean 12°C), based on 45 years of NASA POWER data.
October averages 92 mm of rainfall in Harrisburg, about average for rainfall. The wettest on record was 201 mm in 2005.
The hottest October reached 34.2°C in 2019. The coldest dipped to -5°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 1.2°C. Daytime highs moved from 18.3°C to 19.4°C and overnight lows from 6°C to 7.3°C over the same span.
October is one of the warmer months of the year in Harrisburg and about average for rainfall, so plan for around 17.8°C daytime highs and 6.1°C at night.
Not quite — October is the 7th coolest month in Harrisburg, averaging 12°C.
For October in Harrisburg, pack warm layers and a jacket for chilly mornings, with typical highs of 17.8°C and lows of 6.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in October averages 76% — quite humid.
Average wind speed in October is 0.5 m/s. The windiest October on record averaged 0.5 m/s (1981).
The wettest October on record was 2005 with 201 mm. On average, October sees 92 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 October, 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 October specifically, along with year-by-year records and how the month has changed over the decades.
