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September Weather in Portage, United States

Last updated: June 24, 2025

In September, the average temperature in Portage, United States hovers around 18°C (65°F). Expect variations, with minimums dipping to 2°C (35°F) and maximums soaring up to 31°C (87°F). During this month, Portage receives an average precipitation of 130 mm (5.1 in) spread over 11 days, accompanied by an average humidity of 67%. Stay prepared for both warm days and refreshing showers!

September Temperature in Portage

In September in Portage, the average temperature is 18°C (65°F). Maximums can reach 31°C (87°F), while minimums can be as low as 2°C (35°F). Be prepared for a wide range of temperatures when traveling to Portage during this month.

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 18°C (65°F), with highs reaching up to 31°C (87°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec283238485967727064543933
Data source: Temperature data for Portage generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Portage

In Portage in September, the total precipitation amount is 130 mm (5.1 in) occurring over 11 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 130 mm (5.1 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec861231061271461271259813011488107
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Portage

In Portage in September humidity is 67%. With an average temperature of 18°C (65°F), this humidity feels like a mild blanket wrapping around you, making outdoor activities feel pleasantly refreshing, yet you may find yourself reaching for a drink more often to stay hydrated while exploring the sights.

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 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%89%88%80%79%74%64%67%81%89%88%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3579101010108643
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.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)86 mm (3.4 inches)89%moderate
February Weather0°C (32°F)123 mm (4.8 inches)90%moderate
March Weather3°C (38°F)106 mm (4.2 inches)89%high
April Weather9°C (48°F)127 mm (5.0 inches)88%very high
May Weather15°C (59°F)146 mm (5.8 inches)80%very high
June Weather19°C (67°F)127 mm (5.0 inches)79%very high
July Weather22°C (72°F)125 mm (4.9 inches)74%very high
August Weather21°C (71°F)98 mm (3.8 inches)64%very high
September Weather18°C (65°F)130 mm (5.1 inches)67%very high
October Weather12°C (54°F)114 mm (4.5 inches)81%high
November Weather4°C (39°F)88 mm (3.5 inches)89%moderate
December Weather1°C (33°F)107 mm (4.2 inches)88%moderate

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