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September Weather in Walnut Grove, United States

Last updated: June 24, 2025

In September, the average temperature in Walnut Grove, United States hovers around 23°C (73°F). Visitors can expect a range, with minimums dipping to 8°C (46°F) and maximums soaring to 35°C (95°F). Be prepared for the 64% average humidity and a chance of precipitation totaling 58 mm (2.3 in) over about 6 days.

September Temperature in Walnut Grove

In September in Walnut Grove, the average temperature is 23°C (73°F), with maximums reaching 35°C (95°F) and minimums dropping to 8°C (46°F). This range makes Walnut Grove an ideal destination for travelers seeking pleasant weather and a variety of outdoor activities.

September Weather in Walnut Grove: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Walnut Grove, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Walnut Grove, September typically has an average temperature of 23°C (73°F), with highs reaching up to 35°C (95°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec353749566676807773594641
Data source: Temperature data for Walnut Grove 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 Walnut Grove

In Walnut Grove in September, the precipitation amount is 58 mm (2.3 in) over the course of 6 days.

September Precipitation Trends in Walnut Grove

The chart displays monthly precipitation patterns in Walnut Grove, 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 Walnut Grove, September typically receives around 58 mm (2.3 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec75701331371758095121581266245
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Walnut Grove

In Walnut Grove in September, humidity is 64%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace, making travel quite comfortable yet slightly sticky, urging travelers to enjoy leisurely activities early in the day or seek shade during peak hours.

September Average Humidity in Walnut Grove

This chart illustrates the average monthly humidity levels in Walnut Grove, 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 Walnut Grove is approximately 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%78%76%78%83%83%78%68%64%70%83%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Walnut Grove

In Walnut Grove 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 Walnut Grove.

Maximum UV Index Levels in Walnut Grove for September

The chart shows the monthly maximum UV Index (UVI) for Walnut Grove 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 Walnut Grove typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
Data source: Walnut Grove 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 Walnut Grove Compares to Other Months

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

This table compares monthly weather conditions in Walnut Grove, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (35°F)75 mm (3.0 inches)81%moderate
February Weather3°C (38°F)70 mm (2.8 inches)78%high
March Weather9°C (49°F)133 mm (5.3 inches)76%high
April Weather13°C (56°F)137 mm (5.4 inches)78%very high
May Weather19°C (67°F)175 mm (6.9 inches)83%very high
June Weather25°C (77°F)79 mm (3.1 inches)83%extreme
July Weather27°C (80°F)95 mm (3.7 inches)78%extreme
August Weather25°C (77°F)121 mm (4.8 inches)68%very high
September Weather23°C (73°F)58 mm (2.3 inches)64%very high
October Weather15°C (59°F)126 mm (5.0 inches)70%high
November Weather8°C (47°F)62 mm (2.5 inches)83%moderate
December Weather5°C (42°F)45 mm (1.8 inches)87%moderate

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