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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 18°C (65°F). You can expect minimum temperatures dipping to 1°C (34°F) and soaring to a maximum of 35°C (95°F). This month, the region sees an average precipitation amount of 92 mm (3.6 in) spread over 9 days, contributing to a comfortable average humidity level of 79%.

October Temperature in Harrisburg

In October in Harrisburg, the average temperature is 18°C (65°F). Maximums can reach 35°C (95°F), while minimums can be as low as 1°C (34°F). This diverse temperature range makes Harrisburg an ideal destination for travelers looking to experience both warm days and cooler nights.

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 18°C (65°F), with highs reaching up to 35°C (95°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec434954627177817974655147
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 92 mm (3.6 in) during 9 days, indicating a relatively wet period for the region.

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 92 mm (3.6 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec9211683103113821141051339290120
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 79%. With an average temperature of 18°C (65°F), this humidity feels like walking through a warm mist, making traveling slightly uncomfortable and sticky, but offering a refreshing escape when you find moments of shade or a 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 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%84%82%83%82%80%74%75%79%87%87%
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 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810101110109853
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 Weather6°C (44°F)92 mm (3.6 inches)86%moderate
February Weather9°C (49°F)116 mm (4.6 inches)85%high
March Weather12°C (54°F)83 mm (3.3 inches)84%very high
April Weather17°C (62°F)103 mm (4.0 inches)82%very high
May Weather22°C (71°F)113 mm (4.5 inches)83%very high
June Weather25°C (77°F)82 mm (3.2 inches)82%extreme
July Weather27°C (81°F)114 mm (4.5 inches)80%very high
August Weather26°C (79°F)105 mm (4.1 inches)74%very high
September Weather23°C (75°F)133 mm (5.2 inches)75%very high
October Weather18°C (65°F)92 mm (3.6 inches)79%very high
November Weather10°C (51°F)90 mm (3.5 inches)87%moderate
December Weather8°C (47°F)120 mm (4.7 inches)87%moderate

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