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September Weather in Grannis, United States

Last updated: June 24, 2025

In September, the average temperature in Grannis, United States is a pleasant 24°C (76°F). However, temperatures can fluctuate, with a minimum of 9°C (48°F) and a maximum soaring up to 37°C (100°F). Expect about 71 mm (2.8 in) of precipitation over 8 days, accompanied by an average humidity level of 59%.

September Temperature in Grannis

In September in Grannis, the average temperature is 24°C (76°F). Maximum temperatures can reach 37°C (100°F), while minimum temperatures can drop as low as 9°C (48°F). Be prepared for a wide range of weather conditions to make the most of your travel experience.

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

The chart illustrates September temperature patterns in Grannis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grannis, September typically has an average temperature of 24°C (76°F), with highs reaching up to 37°C (100°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec434656617078818076645248
Data source: Temperature data for Grannis 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 Grannis

In Grannis in September, the precipitation amount is 71 mm (2.8 in) over the course of 8 days.

September Precipitation Trends in Grannis

The chart displays monthly precipitation patterns in Grannis, 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 Grannis, September typically receives around 71 mm (2.8 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec1071591611941951051021087113183137
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Grannis

In Grannis in September humidity is 59%. With an average temperature of 24°C (76°F), this humidity feels like a comfortable, refreshing embrace, making it ideal for leisurely strolls and outdoor explorations.

September Average Humidity in Grannis

This chart illustrates the average monthly humidity levels in Grannis, 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 Grannis is approximately 59%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%79%77%78%82%81%75%61%59%69%82%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Grannis

In Grannis 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 Grannis.

Maximum UV Index Levels in Grannis for September

The chart shows the monthly maximum UV Index (UVI) for Grannis 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 Grannis typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111010854
Data source: Grannis 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 Grannis Compares to Other Months

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

This table compares monthly weather conditions in Grannis, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)107 mm (4.2 inches)82%moderate
February Weather8°C (46°F)159 mm (6.3 inches)79%high
March Weather13°C (56°F)161 mm (6.4 inches)77%very high
April Weather16°C (61°F)194 mm (7.6 inches)78%very high
May Weather21°C (71°F)195 mm (7.7 inches)82%extreme
June Weather26°C (78°F)105 mm (4.1 inches)81%extreme
July Weather27°C (81°F)102 mm (4.0 inches)75%extreme
August Weather27°C (80°F)108 mm (4.3 inches)61%very high
September Weather24°C (76°F)71 mm (2.8 inches)59%very high
October Weather18°C (64°F)131 mm (5.1 inches)69%very high
November Weather11°C (52°F)83 mm (3.3 inches)82%moderate
December Weather9°C (48°F)137 mm (5.4 inches)87%moderate

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