nomadseason

September Weather in Grangeville, United States

Last updated: June 24, 2025

In September, the average temperature in Grangeville, United States is a mild 15°C (60°F). Expect a wide range of temperatures, with lows dropping to -2°C (28°F) and peaks soaring up to 35°C (95°F). Precipitation is moderate, with about 45 mm (1.8 in) spread over 6 days, and the air carries an average humidity of 60%. Whether you’re planning outdoor adventures or cozy indoor activities, be prepared for a bit of everything!

September Temperature in Grangeville

In September in Grangeville, the average temperature is 15°C (60°F). The maximum can reach 35°C (95°F), while the minimum can drop as low as -2°C (28°F). Be prepared for a wide range of temperatures while traveling during this time.

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

The chart illustrates September temperature patterns in Grangeville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grangeville, September typically has an average temperature of 15°C (60°F), with highs reaching up to 35°C (95°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec313038445361717060463831
Data source: Temperature data for Grangeville generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Grangeville

In Grangeville in September, the precipitation amount is 45 mm (1.8 in) over the course of 6 days.

September Precipitation Trends in Grangeville

The chart displays monthly precipitation patterns in Grangeville, 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 Grangeville, September typically receives around 45 mm (1.8 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec6513390106938373045798286
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Grangeville

In Grangeville in September, humidity is 60%. With an average temperature of 15°C (60°F), this humidity feels like a mild blanket enveloping you, making strolls enjoyable yet slightly heavier on the skin, perfect for exploring charming streets without being overly warm.

September Average Humidity in Grangeville

This chart illustrates the average monthly humidity levels in Grangeville, 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 Grangeville is approximately 60%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%91%88%84%77%78%78%63%60%77%86%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Grangeville

In Grangeville 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 Grangeville.

Maximum UV Index Levels in Grangeville for September

The chart shows the monthly maximum UV Index (UVI) for Grangeville 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 Grangeville typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34789101098532
Data source: Grangeville 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 Grangeville Compares to Other Months

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

This table compares monthly weather conditions in Grangeville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)65 mm (2.6 inches)90%moderate
February Weather-1°C (31°F)133 mm (5.2 inches)91%moderate
March Weather3°C (38°F)90 mm (3.5 inches)88%high
April Weather7°C (45°F)106 mm (4.2 inches)84%very high
May Weather12°C (53°F)93 mm (3.6 inches)77%very high
June Weather16°C (61°F)83 mm (3.3 inches)78%very high
July Weather22°C (71°F)7 mm (0.3 inches)77%very high
August Weather21°C (70°F)30 mm (1.2 inches)63%very high
September Weather15°C (60°F)45 mm (1.8 inches)60%very high
October Weather8°C (46°F)79 mm (3.1 inches)77%moderate
November Weather3°C (38°F)82 mm (3.2 inches)86%moderate
December Weather0°C (32°F)86 mm (3.4 inches)89%low

Compare Grangeville's Climate with Cities Worldwide