September Weather in Portage, United States

Last updated: June 24, 2025

In September, the average temperature in Portage, United States hovers around 20°C (68°F), providing a comfortable climate for outdoor activities. However, be prepared for a temperature range that can dip to a cool 6°C (42°F) or soar to a warm 32°C (91°F). Expect 73 mm (2.9 in) of precipitation over 8 days, contributing to an average humidity of 78%. Perfect your plans for a delightful experience!

September Temperature in Portage

In September in Portage, the average temperature is 20°C (68°F). The maximum can reach 32°C (91°F), and the minimum can be as low as 6°C (42°F). This variation in temperature makes Portage an ideal destination for travelers seeking both warm and cooler experiences.

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

The chart illustrates September temperature patterns in Portage, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portage, September typically has an average temperature of 20°C (68°F), with highs reaching up to 32°C (91°F) and lows dropping to around 6°C (42°F).

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

September Precipitation in Portage

In Portage in September, the precipitation amount is 73 mm (2.9 in) over a span of 8 days.

September Precipitation Trends in Portage

The chart displays monthly precipitation patterns in Portage, 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 Portage, September typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 8 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 Portage

In Portage 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 Portage

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

In Portage 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 Portage.

Maximum UV Index Levels in Portage for September

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

Data source: Portage 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 Portage Compares to Other Months

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

This table compares monthly weather conditions in Portage, 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)	73 mm (2.9 inches)	85%	moderate
February Weather	-1°C (30°F)	72 mm (2.8 inches)	85%	moderate
March Weather	4°C (39°F)	99 mm (3.9 inches)	86%	high
April Weather	9°C (48°F)	115 mm (4.5 inches)	87%	very high
May Weather	15°C (60°F)	162 mm (6.4 inches)	81%	very high
June Weather	22°C (71°F)	130 mm (5.1 inches)	82%	very high
July Weather	24°C (75°F)	102 mm (4.0 inches)	81%	very high
August Weather	23°C (73°F)	95 mm (3.7 inches)	79%	very high
September Weather	20°C (68°F)	73 mm (2.9 inches)	78%	very high
October Weather	13°C (56°F)	139 mm (5.5 inches)	81%	high
November Weather	5°C (41°F)	71 mm (2.8 inches)	89%	moderate
December Weather	1°C (35°F)	62 mm (2.4 inches)	86%	low