September Weather in Zwolle, United States

Last updated: June 24, 2025

In September, the average temperature in Zwolle, United States is a warm 26°C (79°F), perfect for outdoor adventures. Expect a minimum temperature of 14°C (57°F) and a maximum of 37°C (99°F), showcasing the season's variability. With an average precipitation of 130 mm (5.1 in) spread over 10 days, it's wise to keep an umbrella handy. The average humidity sits at a comfortable 72%, adding to the pleasant atmosphere of the region!

September Temperature in Zwolle

In September in Zwolle, the average temperature is 26°C (79°F). Maximums can reach 37°C (99°F) and minimums can be as low as 14°C (57°F). This climate makes Zwolle an ideal destination for warm-weather activities, offering a comfortable balance for both relaxation and adventure.

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

The chart illustrates September temperature patterns in Zwolle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Zwolle, September typically has an average temperature of 26°C (79°F), with highs reaching up to 37°C (99°F) and lows dropping to around 14°C (57°F).

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

September Precipitation in Zwolle

In Zwolle in September, the precipitation amount is 130 mm (5.1 in) over a period of 10 days.

September Precipitation Trends in Zwolle

The chart displays monthly precipitation patterns in Zwolle, 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 Zwolle, September typically receives around 130 mm (5.1 inches) of precipitation spread over approximately 10 days.

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

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Millimeters (mm) Inches (in)

September Humidity in Zwolle

In Zwolle in September, humidity is 72%. With an average temperature of 26°C (79°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities feel a bit more strenuous but also adding a tropical charm to your travels.

September Average Humidity in Zwolle

This chart illustrates the average monthly humidity levels in Zwolle, 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 Zwolle is approximately 72%, 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 Zwolle

In Zwolle in September, 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 Zwolle.

Maximum UV Index Levels in Zwolle for September

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

Data source: Zwolle 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 Zwolle Compares to Other Months

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

This table compares monthly weather conditions in Zwolle, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (51°F)	105 mm (4.1 inches)	81%	moderate
February Weather	12°C (53°F)	160 mm (6.3 inches)	81%	very high
March Weather	16°C (62°F)	132 mm (5.2 inches)	79%	very high
April Weather	19°C (66°F)	162 mm (6.4 inches)	80%	extreme
May Weather	24°C (75°F)	171 mm (6.7 inches)	81%	extreme
June Weather	27°C (81°F)	128 mm (5.0 inches)	76%	extreme
July Weather	28°C (83°F)	97 mm (3.8 inches)	73%	extreme
August Weather	28°C (83°F)	139 mm (5.5 inches)	71%	extreme
September Weather	26°C (79°F)	130 mm (5.1 inches)	72%	very high
October Weather	21°C (70°F)	110 mm (4.3 inches)	73%	very high
November Weather	14°C (58°F)	74 mm (2.9 inches)	83%	high
December Weather	12°C (54°F)	133 mm (5.3 inches)	88%	moderate