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September Weather in Riverton, United States

Last updated: June 24, 2025

In Riverton, United States, the average temperature in September is a mild 16°C (61°F). However, you can experience a wide range of temperatures, with a minimum dipping to -5°C (23°F) and a maximum soaring to 35°C (96°F). Expect about 27 mm (1.1 in) of precipitation spread over 4 days, and a pleasant average humidity level of 59%. Stay prepared for whatever the weather may bring!

September Temperature in Riverton

In September in Riverton, the average temperature is 16°C (61°F). Maximum temperatures can reach 35°C (96°F), while minimums can drop as low as -5°C (23°F). Be sure to pack for a wide range of temperatures when you travel!

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

The chart illustrates September temperature patterns in Riverton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Riverton, September typically has an average temperature of 16°C (61°F), with highs reaching up to 35°C (96°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec212336415265737061433424
Data source: Temperature data for Riverton 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 Riverton

In Riverton in September, the total precipitation amount is 27 mm (1.1 in) over a span of 4 days.

September Precipitation Trends in Riverton

The chart displays monthly precipitation patterns in Riverton, 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 Riverton, September typically receives around 27 mm (1.1 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec152338618031212327311716
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Riverton

In Riverton in September, humidity is 59%. With an average temperature of 16°C (61°F), this humidity feels like a refreshing yet slightly damp embrace, making it a comfortable time for sightseeing and exploring, although you might want to carry a light jacket for the occasional chill.

September Average Humidity in Riverton

This chart illustrates the average monthly humidity levels in Riverton, 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 Riverton is approximately 59%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%89%82%72%69%67%65%59%59%69%83%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Riverton

In Riverton 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 Riverton.

Maximum UV Index Levels in Riverton for September

The chart shows the monthly maximum UV Index (UVI) for Riverton 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 Riverton typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109643
Data source: Riverton 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 Riverton Compares to Other Months

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

This table compares monthly weather conditions in Riverton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)15 mm (0.6 inches)90%moderate
February Weather-5°C (23°F)23 mm (0.9 inches)89%moderate
March Weather2°C (36°F)38 mm (1.5 inches)82%high
April Weather5°C (42°F)61 mm (2.4 inches)72%very high
May Weather11°C (52°F)80 mm (3.2 inches)69%very high
June Weather18°C (65°F)30 mm (1.2 inches)67%extreme
July Weather23°C (73°F)21 mm (0.8 inches)65%extreme
August Weather21°C (70°F)23 mm (0.9 inches)59%very high
September Weather16°C (61°F)27 mm (1.1 inches)59%very high
October Weather6°C (43°F)31 mm (1.2 inches)69%high
November Weather1°C (35°F)17 mm (0.7 inches)83%moderate
December Weather-4°C (24°F)16 mm (0.6 inches)89%moderate

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