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September Weather in Grimes, United States

Last updated: June 24, 2025

In September, the average temperature in Grimes, United States is a warm 26°C (79°F), with a range that can dip to a cool 13°C (56°F) and peak at a scorching 38°C (100°F). This month also sees a precipitation of 113 mm (4.4 in) spread over 11 days, contributing to an average humidity of 79%. Prepare for a mix of warm days and occasional rain!

September Temperature in Grimes

In September in Grimes, the average temperature is 26°C (79°F). Maximums can reach 38°C (100°F) and minimums can be as low as 13°C (56°F). This variation means travelers should be prepared for both warm days and cooler nights.

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

The chart illustrates September temperature patterns in Grimes, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grimes, September typically has an average temperature of 26°C (79°F), with highs reaching up to 38°C (100°F) and lows dropping to around 13°C (56°F).
JanFebMarAprMayJunJulAugSepOctNovDec525862667579818179725954
Data source: Temperature data for Grimes 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 Grimes

In Grimes in September, the precipitation amount is 113 mm (4.4 in) over the course of 11 days.

September Precipitation Trends in Grimes

The chart displays monthly precipitation patterns in Grimes, 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 Grimes, September typically receives around 113 mm (4.4 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec96113831111091241301531138546139
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Grimes

In Grimes in September humidity is 79%. With an average temperature of 26°C (79°F), this humidity feels like a warm, sticky embrace that can make outdoor activities feel exhausting. Travelers should be prepared for a heavy air that clings to the skin, making hydration essential while navigating the sights and sounds of the city.

September Average Humidity in Grimes

This chart illustrates the average monthly humidity levels in Grimes, 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 Grimes is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%82%79%77%74%70%78%78%79%74%83%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Grimes

In Grimes in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Grimes.

Maximum UV Index Levels in Grimes for September

The chart shows the monthly maximum UV Index (UVI) for Grimes 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 Grimes typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111111121110864
Data source: Grimes 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 Grimes Compares to Other Months

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

This table compares monthly weather conditions in Grimes, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (52°F)96 mm (3.8 inches)83%moderate
February Weather14°C (58°F)113 mm (4.5 inches)82%very high
March Weather17°C (62°F)83 mm (3.3 inches)79%very high
April Weather19°C (67°F)111 mm (4.4 inches)77%extreme
May Weather24°C (75°F)109 mm (4.3 inches)74%extreme
June Weather26°C (79°F)124 mm (4.9 inches)70%extreme
July Weather27°C (81°F)130 mm (5.1 inches)78%extreme
August Weather27°C (81°F)153 mm (6.0 inches)78%extreme
September Weather26°C (79°F)113 mm (4.4 inches)79%very high
October Weather22°C (72°F)84 mm (3.3 inches)74%very high
November Weather15°C (59°F)46 mm (1.8 inches)83%high
December Weather12°C (55°F)139 mm (5.5 inches)86%moderate

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