July Weather in Grinnell, United States

Last updated: June 24, 2025

In July, the average temperature in Grinnell, United States is a pleasant 24°C (76°F). Visitors can expect a minimum temperature of 13°C (56°F) and a maximum of 34°C (94°F). However, be prepared for some rain, as precipitation averages 81 mm (3.2 in) over 9 days. With an average humidity level of 81%, the air can feel quite warm and moist, so pack accordingly!

July Temperature in Grinnell

In July in Grinnell, the average temperature is 24°C (76°F). Maximums can reach 34°C (94°F), while minimums can dip as low as 13°C (56°F). This mild weather makes Grinnell an ideal destination for travelers seeking comfortable temperatures.

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

The chart illustrates July 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, July typically has an average temperature of 24°C (76°F), with highs reaching up to 34°C (94°F) and lows dropping to around 13°C (56°F).

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

July Precipitation in Grinnell

In Grinnell in July, the precipitation amount is 81 mm (3.2 in) spread over a duration of 9 days.

July Precipitation Trends in Grinnell

The chart displays monthly precipitation patterns in Grinnell, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In Grinnell, July typically receives around 81 mm (3.2 inches) of precipitation spread over approximately 9 days.

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

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Millimeters (mm) Inches (in)

July Humidity in Grinnell

In Grinnell in July, humidity is 81%. With an average temperature of 24°C (76°F), this humidity feels like a warm, muggy embrace that can make outdoor activities feel exhausting, leaving travelers in need of frequent breaks and plenty of hydration.

July Average Humidity in Grinnell

This chart illustrates the average monthly humidity levels in Grinnell, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Grinnell is approximately 81%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in Grinnell

In Grinnell in July, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Grinnell.

Maximum UV Index Levels in Grinnell for July

The chart shows the monthly maximum UV Index (UVI) for Grinnell in July, 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 July, the maximum UV index in Grinnell typically reaches 10, which falls under the very high exposure category.

Data source: Grinnell July 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 July 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 July’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 July’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