October Weather in Harrisburg, United States

Last updated: June 24, 2025

In October, the average temperature in Harrisburg, United States hovers around 11°C (53°F). Expect a minimum that can dip to -3°C (27°F) and a maximum soaring to 27°C (81°F). Be prepared for some moisture, as 91 mm (3.6 in) of precipitation is likely over 9 days. With an average humidity of 81%, it’s safe to say that conditions will feel quite damp throughout the month.

October Temperature in Harrisburg

In October in Harrisburg, the average temperature is 11°C (53°F). Maximums can reach 27°C (81°F) and minimums can drop as low as -3°C (27°F). This diverse temperature range makes Harrisburg an ideal destination for travelers seeking a variety of outdoor experiences.

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 11°C (53°F), with highs reaching up to 27°C (81°F) and lows dropping to around -3°C (27°F).

Data source: Temperature data for Harrisburg generated using information from the Copernicus Climate Change Service.

October Precipitation in Harrisburg

In Harrisburg in October, the precipitation amount is 91 mm (3.6 in) spread over 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 91 mm (3.6 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

October Humidity in Harrisburg

In Harrisburg in October, humidity is 81%. With an average temperature of 11°C (53°F), this humidity feels like a damp chill that can make outdoor activities uncomfortable, requiring layers for protection against the moisture in the air while exploring.

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 81%, offering insight into how humid the weather typically is during this month.

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 reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, 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 5, which falls under the moderate exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (42°F)	160 mm (6.3 inches)	85%	low
February Weather	5°C (41°F)	192 mm (7.5 inches)	84%	moderate
March Weather	7°C (45°F)	140 mm (5.5 inches)	85%	high
April Weather	10°C (50°F)	125 mm (4.9 inches)	83%	high
May Weather	13°C (56°F)	64 mm (2.5 inches)	83%	very high
June Weather	17°C (62°F)	48 mm (1.9 inches)	83%	very high
July Weather	20°C (68°F)	2 mm (0.1 inches)	82%	very high
August Weather	20°C (69°F)	6 mm (0.2 inches)	74%	very high
September Weather	17°C (63°F)	71 mm (2.8 inches)	71%	very high
October Weather	11°C (53°F)	91 mm (3.6 inches)	81%	moderate
November Weather	8°C (46°F)	143 mm (5.6 inches)	87%	moderate
December Weather	5°C (41°F)	195 mm (7.7 inches)	87%	low