October Weather in Grinnell, United States

Last updated: June 24, 2025

In October, the average temperature in Grinnell, United States hovers around 11°C (53°F). While you might experience minimums of -6°C (22°F) and maximums reaching 31°C (88°F), be prepared for about 145 mm (5.7 in) of precipitation over 12 days. The air tends to be quite humid, with an average humidity level of 75%, so dress accordingly!

October Temperature in Grinnell

In October in Grinnell, the average temperature is 11°C (53°F). The maximum can reach 31°C (88°F) and the minimum can be as low as -6°C (22°F). Be prepared for a wide range of temperatures when traveling this month in Grinnell.

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

The chart illustrates October temperature patterns in Grinnell, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grinnell, October typically has an average temperature of 11°C (53°F), with highs reaching up to 31°C (88°F) and lows dropping to around -6°C (22°F).

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

October Precipitation in Grinnell

In Grinnell in October, the precipitation amount is 145 mm (5.7 in) over the course of 12 days.

October Precipitation Trends in Grinnell

The chart displays monthly precipitation patterns in Grinnell, 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 Grinnell, October typically receives around 145 mm (5.7 inches) of precipitation spread over approximately 12 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 Grinnell

In Grinnell in October humidity is 75%. With an average temperature of 11°C (53°F), this humidity feels like a cool, damp embrace that can make exploring the area feel more challenging, as you constantly contend with the moisture in the air while trying to enjoy your travels.

October Average Humidity in Grinnell

This chart illustrates the average monthly humidity levels in Grinnell, 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 Grinnell is approximately 75%, 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 Grinnell

In Grinnell in October, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Grinnell, you can refer to this Hourly UV Index in Grinnell.

Maximum UV Index Levels in Grinnell for October

The chart shows the monthly maximum UV Index (UVI) for Grinnell 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 Grinnell typically reaches 6, which falls under the high exposure category.

Data source: Grinnell 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 Grinnell Compares to Other Months

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

This table compares monthly weather conditions in Grinnell, 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)	43 mm (1.7 inches)	78%	moderate
February Weather	-5°C (23°F)	48 mm (1.9 inches)	80%	moderate
March Weather	4°C (39°F)	79 mm (3.1 inches)	77%	high
April Weather	9°C (49°F)	81 mm (3.2 inches)	77%	very high
May Weather	17°C (62°F)	166 mm (6.5 inches)	77%	very high
June Weather	23°C (74°F)	133 mm (5.2 inches)	81%	extreme
July Weather	24°C (76°F)	81 mm (3.2 inches)	81%	very high
August Weather	23°C (73°F)	71 mm (2.8 inches)	77%	very high
September Weather	20°C (68°F)	118 mm (4.7 inches)	73%	very high
October Weather	11°C (53°F)	145 mm (5.7 inches)	75%	high
November Weather	3°C (38°F)	46 mm (1.8 inches)	85%	moderate
December Weather	-1°C (31°F)	38 mm (1.5 inches)	83%	moderate