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October Weather in Harrisburg, United States

Last updated: June 24, 2025

In Harrisburg, United States, the average temperature in October hovers around 16°C (61°F). Daily fluctuations can be significant, with minimums dipping to -2°C (29°F) and maximums soaring to 35°C (95°F). Expect about 114 mm (4.5 in) of precipitation over 9 days, accompanied by an average humidity level of 74%, creating a unique and varied climate experience.

October Temperature in Harrisburg

In October in Harrisburg, the average temperature is 16°C (61°F), with maximums reaching up to 35°C (95°F) and minimums dropping as low as -2°C (29°F). Whether you're seeking warmth or enjoying cooler evenings, be prepared for a wide range of temperatures during your travels.

October Weather in Harrisburg: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Harrisburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harrisburg, October typically has an average temperature of 16°C (61°F), with highs reaching up to 35°C (95°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec363949576977807773614641
Data source: Temperature data for Harrisburg generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

October Precipitation in Harrisburg

In Harrisburg in October, the precipitation amount is 114 mm (4.5 in) over the course of 9 days.

October Precipitation Trends in Harrisburg

The chart displays monthly precipitation patterns in Harrisburg, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Harrisburg, October typically receives around 114 mm (4.5 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec961151371351281209184791149088
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Harrisburg

In Harrisburg in October humidity is 74%. With an average temperature of 16°C (61°F), this humidity feels like a damp blanket wrapping around you, making traveling quite uncomfortable as the air feels thick and muggy, potentially leading to fatigue and a longing for a cool breeze.

October Average Humidity in Harrisburg

This chart illustrates the average monthly humidity levels in Harrisburg, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Harrisburg is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%84%80%82%83%80%76%75%75%85%88%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Harrisburg

In Harrisburg in October, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Harrisburg.

Maximum UV Index Levels in Harrisburg for October

The chart shows the monthly maximum UV Index (UVI) for Harrisburg in October, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In October, the maximum UV index in Harrisburg typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710111110109753
Data source: Harrisburg October UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How October Weather in Harrisburg Compares to Other Months

Weather in Harrisburg varies notably across the year, with each month offering distinct climate conditions. This page compares October’s weather to other months in Harrisburg, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Harrisburg, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)96 mm (3.8 inches)86%moderate
February Weather4°C (39°F)115 mm (4.5 inches)84%high
March Weather9°C (49°F)137 mm (5.4 inches)84%high
April Weather14°C (57°F)134 mm (5.3 inches)80%very high
May Weather20°C (69°F)128 mm (5.0 inches)82%extreme
June Weather25°C (77°F)120 mm (4.7 inches)83%extreme
July Weather27°C (80°F)91 mm (3.6 inches)79%very high
August Weather25°C (78°F)84 mm (3.3 inches)76%very high
September Weather23°C (74°F)79 mm (3.1 inches)75%very high
October Weather16°C (61°F)114 mm (4.5 inches)74%high
November Weather8°C (46°F)90 mm (3.5 inches)85%moderate
December Weather5°C (42°F)88 mm (3.5 inches)88%moderate

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