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September Weather in Grundy Center, United States

Last updated: June 24, 2025

In Grundy Center, United States, the average temperature in September hovers around 19°C (67°F). Expect a range from a cool 3°C (38°F) at night to a warm 33°C (91°F) during the day. This period brings about 116 mm (4.6 in) of precipitation over approximately 10 days, with an average humidity of 75%.

September Temperature in Grundy Center

In September in Grundy Center, the average temperature is 19°C (67°F). Maximums can reach 33°C (91°F), and minimums can be as low as 3°C (38°F). This makes Grundy Center a great destination for travelers seeking mild weather and a chance to enjoy a variety of outdoor activities.

September Weather in Grundy Center: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Grundy Center, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grundy Center, September typically has an average temperature of 19°C (67°F), with highs reaching up to 33°C (91°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec212137486173757267523729
Data source: Temperature data for Grundy Center 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 Grundy Center

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

September Precipitation Trends in Grundy Center

The chart displays monthly precipitation patterns in Grundy Center, 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 Grundy Center, September typically receives around 116 mm (4.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec42487283153136104731161354836
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Grundy Center

In Grundy Center in September humidity is 75%. With an average temperature of 19°C (67°F), this humidity feels like a warm embrace, making travel invigorating yet slightly sticky, as you navigate through the vibrant streets or scenic landscapes.

September Average Humidity in Grundy Center

This chart illustrates the average monthly humidity levels in Grundy Center, 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 Grundy Center is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%80%81%74%81%80%77%75%80%87%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Grundy Center

In Grundy Center 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 Grundy Center.

Maximum UV Index Levels in Grundy Center for September

The chart shows the monthly maximum UV Index (UVI) for Grundy Center 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 Grundy Center typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098633
Data source: Grundy Center 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 Grundy Center Compares to Other Months

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

This table compares monthly weather conditions in Grundy Center, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)42 mm (1.6 inches)82%moderate
February Weather-6°C (22°F)48 mm (1.9 inches)84%moderate
March Weather3°C (38°F)72 mm (2.8 inches)80%high
April Weather9°C (48°F)83 mm (3.3 inches)81%very high
May Weather16°C (61°F)153 mm (6.0 inches)74%very high
June Weather23°C (73°F)136 mm (5.3 inches)80%extreme
July Weather24°C (75°F)104 mm (4.1 inches)80%very high
August Weather22°C (72°F)73 mm (2.9 inches)77%very high
September Weather19°C (67°F)116 mm (4.6 inches)75%very high
October Weather11°C (52°F)135 mm (5.3 inches)80%high
November Weather3°C (37°F)48 mm (1.9 inches)87%moderate
December Weather-1°C (30°F)36 mm (1.4 inches)83%moderate

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