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September Weather in Grimsley, United States

Last updated: June 24, 2025

In Grimsley, United States, the average temperature in September is a pleasant 21°C (71°F). Expect a temperature range where the minimum can drop to 7°C (45°F), while the maximum can soar up to 34°C (94°F). During this month, anticipate about 116 mm (4.6 in) of precipitation spread over 10 days, contributing to an average humidity level of 71%. Whether you're enjoying the mild temperatures or preparing for the occasional rain, September in Grimsley has a unique charm!

September Temperature in Grimsley

In September in Grimsley, the average temperature is 21°C (71°F). The maximum can reach 34°C (94°F), while the minimum can be as low as 7°C (45°F). This range makes it a great time to visit for those who enjoy mild to warm weather with the possibility of cooler evenings.

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

The chart illustrates September temperature patterns in Grimsley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grimsley, September typically has an average temperature of 21°C (71°F), with highs reaching up to 34°C (94°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec394450576773767571614743
Data source: Temperature data for Grimsley 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 Grimsley

In Grimsley in September, the total precipitation amount is 116 mm (4.6 in) over a span of 10 days.

September Precipitation Trends in Grimsley

The chart displays monthly precipitation patterns in Grimsley, 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 Grimsley, September typically receives around 116 mm (4.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec10319015715914513715415411613373146
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Grimsley

In Grimsley in September humidity is 71%. With an average temperature of 21°C (71°F), this humidity feels like a warm embrace, making it important for travelers to stay hydrated and seek shade during the hottest parts of the day.

September Average Humidity in Grimsley

This chart illustrates the average monthly humidity levels in Grimsley, 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 Grimsley is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%86%82%83%83%80%74%71%78%88%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Grimsley

In Grimsley in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Grimsley.

Maximum UV Index Levels in Grimsley for September

The chart shows the monthly maximum UV Index (UVI) for Grimsley 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 Grimsley typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710111111109753
Data source: Grimsley 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 Grimsley Compares to Other Months

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

This table compares monthly weather conditions in Grimsley, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)103 mm (4.0 inches)87%moderate
February Weather7°C (44°F)190 mm (7.5 inches)86%high
March Weather10°C (51°F)157 mm (6.2 inches)86%high
April Weather14°C (57°F)159 mm (6.3 inches)82%very high
May Weather20°C (68°F)145 mm (5.7 inches)82%extreme
June Weather23°C (73°F)137 mm (5.4 inches)83%extreme
July Weather25°C (77°F)154 mm (6.1 inches)80%extreme
August Weather24°C (75°F)154 mm (6.1 inches)74%very high
September Weather21°C (71°F)116 mm (4.6 inches)71%very high
October Weather16°C (61°F)133 mm (5.2 inches)78%high
November Weather8°C (47°F)73 mm (2.9 inches)88%moderate
December Weather6°C (44°F)146 mm (5.7 inches)88%moderate

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