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September Weather in Rock Springs, United States

Last updated: June 24, 2025

In Rock Springs, United States, the average temperature in September hovers around 19°C (67°F), with temperatures ranging from a brisk 2°C (35°F) to a warm 33°C (92°F). Expect a total precipitation of approximately 25 mm (1.0 in) spread over 3 days, contributing to an average humidity of 62%. Whether you’re looking to bask in the sun or enjoy a cool breeze, this month offers a delightful mix of weather!

September Temperature in Rock Springs

In September in Rock Springs, the average temperature is 19°C (67°F), with maximums hitting 33°C (92°F) and minimums dropping to 2°C (35°F). This varied climate makes it a great time to explore Rock Springs, so be sure to pack for both warm days and cooler evenings.

September Weather in Rock Springs: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Rock Springs, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rock Springs, September typically has an average temperature of 19°C (67°F), with highs reaching up to 33°C (92°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec313543536173757467544333
Data source: Temperature data for Rock Springs 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 Rock Springs

In Rock Springs in September, the precipitation amount is 25 mm (1.0 in) over the course of 3 days.

September Precipitation Trends in Rock Springs

The chart displays monthly precipitation patterns in Rock Springs, 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 Rock Springs, September typically receives around 25 mm (1.0 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec27313215165381225211424
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Rock Springs

In Rock Springs in September humidity is 62%. With an average temperature of 19°C (67°F), this humidity feels like a warm embrace, making it pleasant for traveling, though you might want to stay hydrated and take occasional breaks in the shade to fully enjoy your adventures.

September Average Humidity in Rock Springs

This chart illustrates the average monthly humidity levels in Rock Springs, 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 Rock Springs is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%83%71%61%48%36%37%46%62%74%82%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Rock Springs

In Rock Springs in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Rock Springs.

Maximum UV Index Levels in Rock Springs for September

The chart shows the monthly maximum UV Index (UVI) for Rock Springs 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 Rock Springs typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479111213131211864
Data source: Rock Springs 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 Rock Springs Compares to Other Months

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

This table compares monthly weather conditions in Rock Springs, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)27 mm (1.1 inches)81%moderate
February Weather2°C (35°F)31 mm (1.2 inches)83%high
March Weather6°C (43°F)32 mm (1.3 inches)71%very high
April Weather12°C (53°F)15 mm (0.6 inches)61%extreme
May Weather16°C (61°F)15 mm (0.6 inches)48%extreme
June Weather23°C (73°F)5 mm (0.2 inches)36%extreme
July Weather24°C (75°F)38 mm (1.5 inches)37%extreme
August Weather23°C (74°F)12 mm (0.5 inches)46%extreme
September Weather19°C (67°F)25 mm (1.0 inches)62%extreme
October Weather12°C (54°F)21 mm (0.8 inches)74%very high
November Weather6°C (44°F)14 mm (0.5 inches)82%high
December Weather1°C (33°F)24 mm (1.0 inches)82%moderate

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