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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 22°C (71°F), with daily fluctuations that can see a minimum of 1°C (34°F) and a maximum soaring to a sweltering 38°C (100°F). Precipitation during this month typically amounts to 13 mm (0.5 in), spread over just 2 days, while the average humidity sits at a comfortable 47%. Enjoy the mild weather and plan your activities accordingly!

September Temperature in Green River

In September in Green River, the average temperature is 22°C (71°F). Maximums can reach 38°C (100°F) and minimums can be as low as 1°C (34°F). This diverse temperature range makes Green River an ideal destination for travelers seeking a mix of warm days and cooler evenings.

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 22°C (71°F), with highs reaching up to 38°C (100°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec303748566578848171534233
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 13 mm (0.5 in) over a span of 2 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 13 mm (0.5 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec1920231120581213231515
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 47%. With an average temperature of 22°C (71°F), this humidity feels like a pleasantly mild embrace, making it ideal for leisurely explorations and outdoor activities without feeling overly sticky or uncomfortable.

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 47%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%77%70%54%45%37%34%47%67%82%87%
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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec368101112121110753
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-1°C (30°F)19 mm (0.7 inches)87%moderate
February Weather3°C (37°F)20 mm (0.8 inches)88%high
March Weather9°C (48°F)23 mm (0.9 inches)77%very high
April Weather13°C (56°F)11 mm (0.4 inches)69%very high
May Weather18°C (65°F)20 mm (0.8 inches)54%extreme
June Weather25°C (78°F)5 mm (0.2 inches)45%extreme
July Weather29°C (84°F)8 mm (0.3 inches)37%extreme
August Weather27°C (81°F)12 mm (0.5 inches)34%extreme
September Weather22°C (71°F)13 mm (0.5 inches)47%very high
October Weather11°C (53°F)23 mm (0.9 inches)67%high
November Weather5°C (42°F)15 mm (0.6 inches)82%moderate
December Weather0°C (33°F)15 mm (0.6 inches)87%moderate

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