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September Weather in Riverton, United States

Last updated: June 24, 2025

In September, the average temperature in Riverton, United States hovers around 22°C (71°F). The weather can vary significantly, with temperatures dipping as low as 6°C (42°F) and soaring up to 35°C (95°F). Expect about 59 mm (2.3 in) of precipitation over 6 days, and don't forget that the average humidity sits at a high 79%.

September Temperature in Riverton

In September in Riverton, the average temperature is 22°C (71°F). Maximum temperatures can reach 35°C (95°F), while minimum temperatures can drop as low as 6°C (42°F). Overall, it's a great time for travelers to enjoy mild weather and a range of outdoor activities.

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 22°C (71°F), with highs reaching up to 35°C (95°F) and lows dropping to around 6°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec293244536575777471574236
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 precipitation amount is 59 mm (2.3 in) over the course of 6 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 59 mm (2.3 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec697113313014411911288591047051
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 79%. With an average temperature of 22°C (71°F), this humidity feels like a warm, sticky embrace that can make any outdoor adventure quite challenging for traveling; it's advisable to stay hydrated and take breaks in the shade to fully enjoy the sights.

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 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%84%83%80%83%82%83%79%79%88%87%
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 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 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910111198643
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-2°C (29°F)69 mm (2.7 inches)84%moderate
February Weather0°C (32°F)71 mm (2.8 inches)82%moderate
March Weather6°C (44°F)133 mm (5.2 inches)84%high
April Weather11°C (53°F)130 mm (5.1 inches)83%very high
May Weather19°C (66°F)144 mm (5.7 inches)80%very high
June Weather24°C (75°F)119 mm (4.7 inches)83%extreme
July Weather25°C (78°F)112 mm (4.4 inches)82%extreme
August Weather23°C (75°F)88 mm (3.5 inches)82%very high
September Weather22°C (71°F)59 mm (2.3 inches)79%very high
October Weather14°C (58°F)104 mm (4.1 inches)79%high
November Weather5°C (42°F)70 mm (2.8 inches)88%moderate
December Weather2°C (36°F)51 mm (2.0 inches)87%moderate

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