September Weather in Garnavillo, United States

Last updated: June 24, 2025

In September, the average temperature in Garnavillo, United States is a comfortable 19°C (66°F), with extremes ranging from a chilly 3°C (38°F) to a warm 33°C (91°F). Expect about 120 mm (4.7 in) of precipitation spread over 10 days, contributing to an average humidity level of 74%. Whether you prefer the cool breezes or warmer days, this month offers a delightful mix of climate experiences!

September Temperature in Garnavillo

In September in Garnavillo, the average temperature is 19°C (66°F). Maximum temperatures can reach 33°C (91°F), while minimums can drop as low as 3°C (38°F). This climate makes Garnavillo an ideal destination for travelers seeking a mix of warm and cool experiences.

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

The chart illustrates September temperature patterns in Garnavillo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Garnavillo, September typically has an average temperature of 19°C (66°F), with highs reaching up to 33°C (91°F) and lows dropping to around 3°C (38°F).

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

September Precipitation in Garnavillo

In Garnavillo in September, the precipitation amount is 120 mm (4.7 in) spread over a duration of 10 days.

September Precipitation Trends in Garnavillo

The chart displays monthly precipitation patterns in Garnavillo, 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 Garnavillo, September typically receives around 120 mm (4.7 inches) of precipitation spread over approximately 10 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 Garnavillo

In Garnavillo in September humidity is 74%. With an average temperature of 19°C (66°F), this humidity feels like a warm, enveloping blanket, making it ideal for leisurely outdoor exploration but potentially heavy for those not accustomed to tropical conditions.

September Average Humidity in Garnavillo

This chart illustrates the average monthly humidity levels in Garnavillo, 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 Garnavillo is approximately 74%, 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 Garnavillo

In Garnavillo 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 Garnavillo.

Maximum UV Index Levels in Garnavillo for September

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

Data source: Garnavillo 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 Garnavillo Compares to Other Months

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

This table compares monthly weather conditions in Garnavillo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	44 mm (1.7 inches)	84%	moderate
February Weather	-6°C (22°F)	56 mm (2.2 inches)	85%	moderate
March Weather	2°C (37°F)	62 mm (2.5 inches)	84%	moderate
April Weather	8°C (47°F)	78 mm (3.1 inches)	83%	very high
May Weather	16°C (60°F)	150 mm (5.9 inches)	75%	very high
June Weather	22°C (72°F)	130 mm (5.1 inches)	79%	very high
July Weather	24°C (75°F)	103 mm (4.0 inches)	75%	very high
August Weather	22°C (71°F)	87 mm (3.4 inches)	69%	very high
September Weather	19°C (66°F)	120 mm (4.7 inches)	74%	very high
October Weather	10°C (51°F)	133 mm (5.2 inches)	79%	moderate
November Weather	2°C (36°F)	47 mm (1.9 inches)	88%	moderate
December Weather	-2°C (29°F)	40 mm (1.6 inches)	82%	low