October Weather in Rapid City, United States

Last updated: June 24, 2025

In Rapid City, United States, the average temperature in October hovers around 10°C (49°F), with fluctuations ranging from a chilly -4°C (25°F) to a warm 26°C (79°F). Expect about 131 mm (5.2 in) of precipitation spread over 17 days, while the air remains humid, averaging around 83%. Whether you’re packing for rain or shine, be prepared for a mix of weather!

October Temperature in Rapid City

In October in Rapid City, the average temperature is 10°C (49°F). Maximums can reach 26°C (79°F) and minimums can be as low as -4°C (25°F). This range makes it a great time for travelers to pack layers and enjoy a variety of outdoor activities.

October Weather in Rapid City: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Rapid City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rapid City, October typically has an average temperature of 10°C (49°F), with highs reaching up to 26°C (79°F) and lows dropping to around -4°C (25°F).

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

October Precipitation in Rapid City

In Rapid City in October, the total precipitation amount is 131 mm (5.2 in) over the course of 17 days.

October Precipitation Trends in Rapid City

The chart displays monthly precipitation patterns in Rapid City, 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 Rapid City, October typically receives around 131 mm (5.2 inches) of precipitation spread over approximately 17 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 Rapid City

In Rapid City in October humidity is 83%. With an average temperature of 10°C (49°F), this humidity feels like a damp chill enveloping you, making outdoor activities feel more uncomfortable and potentially dampening your travel experience.

October Average Humidity in Rapid City

This chart illustrates the average monthly humidity levels in Rapid City, 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 Rapid City is approximately 83%, 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 Rapid City

In Rapid City 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 Rapid City.

Maximum UV Index Levels in Rapid City for October

The chart shows the monthly maximum UV Index (UVI) for Rapid City 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 Rapid City typically reaches 5, which falls under the moderate exposure category.

Data source: Rapid City 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 Rapid City Compares to Other Months

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

This table compares monthly weather conditions in Rapid City, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (22°F)	57 mm (2.2 inches)	91%	low
February Weather	-6°C (22°F)	62 mm (2.4 inches)	91%	moderate
March Weather	-1°C (31°F)	62 mm (2.4 inches)	87%	moderate
April Weather	5°C (42°F)	97 mm (3.8 inches)	87%	high
May Weather	13°C (56°F)	119 mm (4.7 inches)	82%	very high
June Weather	19°C (66°F)	111 mm (4.4 inches)	79%	very high
July Weather	21°C (71°F)	103 mm (4.1 inches)	75%	very high
August Weather	20°C (68°F)	91 mm (3.6 inches)	76%	very high
September Weather	16°C (61°F)	78 mm (3.1 inches)	79%	high
October Weather	10°C (49°F)	131 mm (5.2 inches)	83%	moderate
November Weather	2°C (35°F)	77 mm (3.0 inches)	86%	moderate
December Weather	-2°C (28°F)	74 mm (2.9 inches)	87%	low