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September Weather in Green River, United States

Last updated: June 24, 2025

In Green River, United States, the average temperature in September hovers around 16°C (62°F). However, temperatures can oscillate between a minimum of -2°C (29°F) and a maximum of 33°C (93°F). During this month, you can expect about 19 mm (0.7 in) of precipitation spread out over 3 days, with an average humidity level of 50%. Stay prepared for a range of weather conditions!

September Temperature in Green River

In September in Green River, the average temperature is 16°C (62°F), with maximums reaching 33°C (93°F) and minimums dropping as low as -2°C (29°F). Be prepared for a wide range of temperatures during your travels, so pack accordingly!

September Weather in Green River: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Green River, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Green River, September typically has an average temperature of 16°C (62°F), with highs reaching up to 33°C (93°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec192131425266747161443422
Data source: Temperature data for Green River 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 Green River

In Green River in September, the precipitation amount is 19 mm (0.7 in) over a period of 3 days.

September Precipitation Trends in Green River

The chart displays monthly precipitation patterns in Green River, 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 Green River, September typically receives around 19 mm (0.7 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec24244138441571119212322
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Green River

In Green River in September, humidity is 50%. With an average temperature of 16°C (62°F), this humidity feels like a refreshing breeze that keeps you comfortable while exploring the sights, making it an ideal time for leisurely walks and outdoor activities.

September Average Humidity in Green River

This chart illustrates the average monthly humidity levels in Green River, 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 Green River is approximately 50%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%93%85%73%64%57%45%41%50%70%84%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Green River

In Green River 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 Green River.

Maximum UV Index Levels in Green River for September

The chart shows the monthly maximum UV Index (UVI) for Green River 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 Green River typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46710111212119743
Data source: Green River 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 Green River Compares to Other Months

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

This table compares monthly weather conditions in Green River, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (19°F)24 mm (0.9 inches)92%moderate
February Weather-6°C (22°F)24 mm (1.0 inches)93%high
March Weather0°C (32°F)41 mm (1.6 inches)85%high
April Weather5°C (42°F)38 mm (1.5 inches)73%very high
May Weather11°C (53°F)44 mm (1.7 inches)64%extreme
June Weather19°C (66°F)15 mm (0.6 inches)57%extreme
July Weather23°C (74°F)7 mm (0.3 inches)45%extreme
August Weather22°C (72°F)11 mm (0.4 inches)41%extreme
September Weather16°C (62°F)19 mm (0.7 inches)50%very high
October Weather7°C (44°F)21 mm (0.8 inches)70%high
November Weather1°C (34°F)23 mm (0.9 inches)84%moderate
December Weather-6°C (22°F)22 mm (0.9 inches)90%moderate

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