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September Weather in Pentwater, United States

Last updated: June 24, 2025

The average temperature in Pentwater, United States in September hovers around 18°C (64°F). Expect a comfortable range where the minimum can dip to 8°C (46°F) and the maximum can rise to 26°C (78°F). Be prepared for some moisture, as the area typically receives 99 mm (3.9 in) of precipitation over about 10 days, with an average humidity of 79%.

September Temperature in Pentwater

In September in Pentwater, the average temperature is 18°C (64°F). Maximums can reach 26°C (78°F), while minimums can drop as low as 8°C (46°F). This makes it a pleasant time to explore the outdoors and enjoy various activities in Pentwater.

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

The chart illustrates September temperature patterns in Pentwater, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Pentwater, September typically has an average temperature of 18°C (64°F), with highs reaching up to 26°C (78°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec282734404959697064534033
Data source: Temperature data for Pentwater 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 Pentwater

In Pentwater in September, the total precipitation amount is 99 mm (3.9 in) spread over a period of 10 days.

September Precipitation Trends in Pentwater

The chart displays monthly precipitation patterns in Pentwater, 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 Pentwater, September typically receives around 99 mm (3.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec6963681031071066689991377479
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Pentwater

In Pentwater in September, humidity is 79%. With an average temperature of 18°C (64°F), this humidity feels like a warm, sticky embrace that can make outdoor activities more challenging but also creates a lush, vibrant atmosphere that's perfect for exploring local culture and scenery.

September Average Humidity in Pentwater

This chart illustrates the average monthly humidity levels in Pentwater, 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 Pentwater is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%87%82%81%78%79%80%82%87%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Pentwater

In Pentwater in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Pentwater.

Maximum UV Index Levels in Pentwater for September

The chart shows the monthly maximum UV Index (UVI) for Pentwater 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 Pentwater typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097532
Data source: Pentwater 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 Pentwater Compares to Other Months

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

This table compares monthly weather conditions in Pentwater, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)69 mm (2.7 inches)87%low
February Weather-3°C (27°F)63 mm (2.5 inches)87%moderate
March Weather1°C (34°F)68 mm (2.7 inches)86%moderate
April Weather5°C (40°F)103 mm (4.1 inches)87%very high
May Weather9°C (49°F)107 mm (4.2 inches)82%very high
June Weather15°C (60°F)106 mm (4.2 inches)81%very high
July Weather20°C (69°F)66 mm (2.6 inches)78%very high
August Weather21°C (70°F)89 mm (3.5 inches)79%very high
September Weather18°C (64°F)99 mm (3.9 inches)79%high
October Weather12°C (53°F)137 mm (5.4 inches)82%moderate
November Weather4°C (40°F)74 mm (2.9 inches)87%moderate
December Weather1°C (33°F)79 mm (3.1 inches)86%low

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