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September Weather in Teton, United States

Last updated: June 24, 2025

In Teton, United States, the average temperature for September hovers around 15°C (59°F). However, be prepared for a range, as temperatures can dip as low as -1°C (30°F) and soar up to 34°C (94°F). Precipitation during this month averages 36 mm (1.4 in) over the course of 4 days, while the average humidity sits at a comfortable 52%.

September Temperature in Teton

In September in Teton, the average temperature is 15°C (59°F). Maximum temperatures can reach 34°C (94°F), while minimums can drop as low as -1°C (30°F). This climate makes Teton a versatile destination for travelers, offering both warm days and cooler nights to enjoy different experiences.

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

The chart illustrates September temperature patterns in Teton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Teton, September typically has an average temperature of 15°C (59°F), with highs reaching up to 34°C (94°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec202434425262706859433222
Data source: Temperature data for Teton 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 Teton

In Teton in September, the precipitation amount is 36 mm (1.4 in) over the course of 4 days.

September Precipitation Trends in Teton

The chart displays monthly precipitation patterns in Teton, 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 Teton, September typically receives around 36 mm (1.4 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec54564763654292136464350
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Teton

In Teton in September, humidity is 52%. With an average temperature of 15°C (59°F), this humidity feels like a refreshing coolness in the air, making it comfortable for traveling while bringing a slight moisture that invigorates the senses.

September Average Humidity in Teton

This chart illustrates the average monthly humidity levels in Teton, 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 Teton is approximately 52%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec95%95%90%81%71%64%59%49%52%69%86%91%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Teton

In Teton 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 Teton.

Maximum UV Index Levels in Teton for September

The chart shows the monthly maximum UV Index (UVI) for Teton 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 Teton typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3578101111109643
Data source: Teton 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 Teton Compares to Other Months

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

This table compares monthly weather conditions in Teton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (20°F)54 mm (2.1 inches)95%moderate
February Weather-5°C (24°F)56 mm (2.2 inches)95%moderate
March Weather1°C (34°F)47 mm (1.8 inches)90%high
April Weather5°C (42°F)63 mm (2.5 inches)81%very high
May Weather11°C (52°F)65 mm (2.5 inches)71%very high
June Weather16°C (62°F)42 mm (1.7 inches)64%extreme
July Weather21°C (71°F)9 mm (0.4 inches)59%extreme
August Weather20°C (68°F)21 mm (0.8 inches)49%very high
September Weather15°C (59°F)36 mm (1.4 inches)52%very high
October Weather6°C (43°F)46 mm (1.8 inches)69%high
November Weather0°C (33°F)43 mm (1.7 inches)86%moderate
December Weather-6°C (22°F)50 mm (2.0 inches)91%moderate

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