September Weather in Platteville, United States

Last updated: August 27, 2025

In Platteville, United States, the average temperature in September is a pleasant 19°C (66°F). However, temperatures can range from a cool 3°C (37°F) to a warm 32°C (91°F). Visitors can expect 117 mm (4.6 in) of precipitation spread over 10 days, coupled with an average humidity of 74%.

September Temperature in Platteville

In September in Platteville, the average temperature is 19°C (66°F). Maximums can reach 32°C (91°F), while minimums can drop as low as 3°C (37°F). Be prepared for a wide range of temperatures, making it ideal for travelers to pack layers for varying conditions.

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

The chart illustrates September temperature patterns in Platteville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Platteville, September typically has an average temperature of 19°C (66°F), with highs reaching up to 32°C (91°F) and lows dropping to around 3°C (37°F).

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

September Precipitation in Platteville

In Platteville in September, the total precipitation amount is 117 mm (4.6 in) recorded over a span of 10 days.

September Precipitation Trends in Platteville

The chart displays monthly precipitation patterns in Platteville, 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 Platteville, September typically receives around 117 mm (4.6 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 Platteville

In Platteville 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 Platteville

This chart illustrates the average monthly humidity levels in Platteville, 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 Platteville 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 Platteville

In Platteville 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 Platteville.

Maximum UV Index Levels in Platteville for September

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

Data source: Platteville 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 Platteville Compares to Other Months

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

This table compares monthly weather conditions in Platteville, 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)	48 mm (1.9 inches)	84%	moderate
February Weather	-5°C (23°F)	60 mm (2.4 inches)	85%	moderate
March Weather	3°C (37°F)	63 mm (2.5 inches)	84%	high
April Weather	8°C (47°F)	89 mm (3.5 inches)	83%	very high
May Weather	16°C (60°F)	144 mm (5.7 inches)	75%	very high
June Weather	22°C (71°F)	133 mm (5.3 inches)	79%	very high
July Weather	24°C (75°F)	99 mm (3.9 inches)	75%	very high
August Weather	22°C (71°F)	98 mm (3.9 inches)	69%	very high
September Weather	19°C (66°F)	117 mm (4.6 inches)	74%	very high
October Weather	11°C (51°F)	124 mm (4.9 inches)	79%	moderate
November Weather	2°C (37°F)	45 mm (1.8 inches)	88%	moderate
December Weather	-2°C (30°F)	43 mm (1.7 inches)	82%	low