October Weather in Harrisburg, United States

Last updated: June 24, 2025

In October, the average temperature in Harrisburg, United States hovers around 18°C (64°F), offering a blend of warmth and chill. Temperatures can range from a cool -2°C (28°F) to a sizzling 35°C (95°F). Expect about 129 mm (5.1 in) of precipitation spread over 9 days, contributing to an average humidity level of 76%. Prepare for a varied and dynamic climate!

October Temperature in Harrisburg

In October in Harrisburg, the average temperature is 18°C (64°F). Maximum temperatures can reach 35°C (95°F), while minimums can drop as low as -2°C (28°F). Be prepared for a wide range of weather if you plan to travel during this month!

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 (64°F), with highs reaching up to 35°C (95°F) and lows dropping to around -2°C (28°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 total precipitation amount is 129 mm (5.1 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 129 mm (5.1 inches) of precipitation spread over approximately 9 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

October Humidity in Harrisburg

In Harrisburg in October, humidity is 76%. With an average temperature of 18°C (64°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities feel steamy and invigorating—perfect for exploring charming streets, though you might want to take breaks in the shade.

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 76%, 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 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.

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 (41°F)	100 mm (3.9 inches)	84%	moderate
February Weather	7°C (45°F)	172 mm (6.8 inches)	83%	high
March Weather	12°C (54°F)	166 mm (6.5 inches)	81%	very high
April Weather	16°C (61°F)	136 mm (5.4 inches)	81%	very high
May Weather	22°C (72°F)	146 mm (5.8 inches)	83%	extreme
June Weather	26°C (79°F)	114 mm (4.5 inches)	83%	extreme
July Weather	28°C (82°F)	112 mm (4.4 inches)	81%	extreme
August Weather	26°C (80°F)	108 mm (4.3 inches)	74%	very high
September Weather	24°C (76°F)	86 mm (3.4 inches)	71%	very high
October Weather	18°C (64°F)	129 mm (5.1 inches)	76%	high
November Weather	10°C (50°F)	78 mm (3.1 inches)	84%	moderate
December Weather	8°C (46°F)	134 mm (5.3 inches)	88%	moderate