September Weather in Grabill, United States

Last updated: June 24, 2025

In September, the average temperature in Grabill, United States hovers around 20°C (68°F), offering a comfortable climate. Expect temperatures to range from a cool 3°C (39°F) at their lowest to a warm 33°C (92°F) at their peak. During this month, precipitation averages 64 mm (2.5 in) spread over 7 days, while humidity levels sit at a high 78%. Enjoy the balance of warmth and refreshing breezes!

September Temperature in Grabill

In September in Grabill, the average temperature is 20°C (68°F), with maximums reaching 33°C (92°F) and minimums dipping as low as 3°C (39°F). It's a great time to experience Grabill's diverse climate, so pack accordingly for both warm days and cooler nights.

September Weather in Grabill: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Grabill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grabill, September typically has an average temperature of 20°C (68°F), with highs reaching up to 33°C (92°F) and lows dropping to around 3°C (39°F).

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

September Precipitation in Grabill

In Grabill in September, the precipitation amount is 64 mm (2.5 in) accumulated over a period of 7 days.

September Precipitation Trends in Grabill

The chart displays monthly precipitation patterns in Grabill, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Grabill, September typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 7 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Grabill

In Grabill in September humidity is 78%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that makes exploring the sights a bit sticky, so travelers should stay hydrated and take frequent breaks in the shade.

September Average Humidity in Grabill

This chart illustrates the average monthly humidity levels in Grabill, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Grabill is approximately 78%, offering insight into how humid the weather typically is during this month.

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

September UV Index in Grabill

In Grabill in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Grabill.

Maximum UV Index Levels in Grabill for September

The chart shows the monthly maximum UV Index (UVI) for Grabill in September, 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 September, the maximum UV index in Grabill typically reaches 8, which falls under the very high exposure category.

Data source: Grabill September 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 September Weather in Grabill Compares to Other Months

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

This table compares monthly weather conditions in Grabill, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (28°F)	72 mm (2.9 inches)	85%	moderate
February Weather	-1°C (30°F)	76 mm (3.0 inches)	85%	moderate
March Weather	4°C (40°F)	101 mm (4.0 inches)	86%	high
April Weather	9°C (49°F)	96 mm (3.8 inches)	87%	very high
May Weather	17°C (62°F)	129 mm (5.1 inches)	81%	very high
June Weather	22°C (72°F)	126 mm (5.0 inches)	82%	very high
July Weather	24°C (76°F)	104 mm (4.1 inches)	81%	very high
August Weather	23°C (73°F)	100 mm (3.9 inches)	79%	very high
September Weather	20°C (68°F)	64 mm (2.5 inches)	78%	very high
October Weather	13°C (56°F)	104 mm (4.1 inches)	81%	high
November Weather	5°C (41°F)	81 mm (3.2 inches)	89%	moderate
December Weather	1°C (34°F)	59 mm (2.3 inches)	86%	low