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September Weather in Mammoth, United States

Last updated: June 24, 2025

In Mammoth, United States, the average temperature in September is a warm 26°C (80°F). While the thermometer can dip to a minimum of 12°C (53°F), it can also soar to a sweltering 40°C (105°F). During this month, expect about 39 mm (1.5 in) of precipitation spread over 4 days, resulting in an average humidity of 64%—making it a month of both warmth and occasional rainfall.

September Temperature in Mammoth

In September in Mammoth, the average temperature is 26°C (80°F), with maximums reaching 40°C (105°F) and minimums dipping as low as 12°C (53°F). Be prepared for a range of weather conditions while enjoying your travels!

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

The chart illustrates September temperature patterns in Mammoth, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mammoth, September typically has an average temperature of 26°C (80°F), with highs reaching up to 40°C (105°F) and lows dropping to around 12°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec495158687585858480696050
Data source: Temperature data for Mammoth 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 Mammoth

In Mammoth in September, the precipitation amount is 39 mm (1.5 in) spread over a period of 4 days.

September Precipitation Trends in Mammoth

The chart displays monthly precipitation patterns in Mammoth, 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 Mammoth, September typically receives around 39 mm (1.5 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec4450305711845539282437
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mammoth

In Mammoth in September humidity is 64%. With an average temperature of 26°C (80°F), this humidity feels like a warm, enveloping blanket, making travel both invigorating and a bit sticky, encouraging frequent pauses for cool drinks and shaded spots.

September Average Humidity in Mammoth

This chart illustrates the average monthly humidity levels in Mammoth, 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 Mammoth is approximately 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%79%67%55%40%33%34%48%64%67%77%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mammoth

In Mammoth in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Mammoth.

Maximum UV Index Levels in Mammoth for September

The chart shows the monthly maximum UV Index (UVI) for Mammoth 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 Mammoth typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579111212121111864
Data source: Mammoth 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 Mammoth Compares to Other Months

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

This table compares monthly weather conditions in Mammoth, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (49°F)44 mm (1.7 inches)76%moderate
February Weather11°C (51°F)50 mm (2.0 inches)79%high
March Weather15°C (58°F)30 mm (1.2 inches)67%very high
April Weather20°C (68°F)5 mm (0.2 inches)55%extreme
May Weather24°C (75°F)7 mm (0.3 inches)40%extreme
June Weather30°C (85°F)11 mm (0.4 inches)33%extreme
July Weather30°C (85°F)84 mm (3.3 inches)34%extreme
August Weather29°C (84°F)55 mm (2.2 inches)48%extreme
September Weather26°C (80°F)39 mm (1.5 inches)64%extreme
October Weather21°C (69°F)28 mm (1.1 inches)67%very high
November Weather15°C (60°F)23 mm (0.9 inches)77%high
December Weather10°C (51°F)37 mm (1.5 inches)82%moderate

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