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September Weather in Mackinaw, United States

Last updated: June 24, 2025

In September, the average temperature in Mackinaw, United States hovers around 21°C (70°F). Be prepared for a range of temperatures, with daytime highs reaching up to 35°C (95°F) and cooler nights dipping to a minimum of 5°C (42°F). Expect about 62 mm (2.5 in) of precipitation over approximately 7 days, accompanied by an average humidity of 80%.

September Temperature in Mackinaw

In September in Mackinaw, the average temperature is 21°C (70°F), with maximums reaching 35°C (95°F) and minimums dropping as low as 5°C (42°F). This diverse range in temperatures makes it essential to pack for both warm days and cooler evenings during your travels.

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

The chart illustrates September temperature patterns in Mackinaw, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mackinaw, September typically has an average temperature of 21°C (70°F), with highs reaching up to 35°C (95°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec273042516474777470564035
Data source: Temperature data for Mackinaw 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 Mackinaw

In Mackinaw in September, the precipitation amount is 62 mm (2.5 in) over a period of 7 days.

September Precipitation Trends in Mackinaw

The chart displays monthly precipitation patterns in Mackinaw, 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 Mackinaw, September typically receives around 62 mm (2.5 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec646911411916212911389621236156
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mackinaw

In Mackinaw in September humidity is 80%. With an average temperature of 21°C (70°F), this humidity feels like a warm, enveloping blanket that can make even short walks feel draining, urging travelers to seek shade or a cool drink frequently.

September Average Humidity in Mackinaw

This chart illustrates the average monthly humidity levels in Mackinaw, 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 Mackinaw is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mackinaw

In Mackinaw 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 Mackinaw.

Maximum UV Index Levels in Mackinaw for September

The chart shows the monthly maximum UV Index (UVI) for Mackinaw 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 Mackinaw typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910111098642
Data source: Mackinaw 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 Mackinaw Compares to Other Months

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

This table compares monthly weather conditions in Mackinaw, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)64 mm (2.5 inches)82%moderate
February Weather-1°C (30°F)69 mm (2.7 inches)83%moderate
March Weather5°C (42°F)114 mm (4.5 inches)84%high
April Weather11°C (51°F)119 mm (4.7 inches)85%very high
May Weather18°C (64°F)162 mm (6.4 inches)79%very high
June Weather23°C (74°F)129 mm (5.1 inches)82%extreme
July Weather25°C (77°F)113 mm (4.5 inches)80%very high
August Weather23°C (74°F)89 mm (3.5 inches)81%very high
September Weather21°C (70°F)62 mm (2.5 inches)80%very high
October Weather13°C (56°F)123 mm (4.8 inches)82%high
November Weather5°C (41°F)61 mm (2.4 inches)88%moderate
December Weather1°C (35°F)56 mm (2.2 inches)84%low

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