Last updated: June 24, 2025
In Rock Springs, United States, the average temperature in September hovers around 16°C (61°F), offering a mild climate. Be prepared for a range of temperatures, as it can dip to a chilly -3°C (27°F) or soar to a warm 33°C (91°F). During this month, expect approximately 20 mm (0.8 in) of precipitation spread over 3 days, accompanied by an average humidity of 50%.
In September, in Rock Springs, the average temperature is 16°C (61°F). The maximum can reach 33°C (91°F), while the minimum can drop to as low as -3°C (27°F). This wide temperature range makes Rock Springs a destination where travelers should prepare for both warm days and chilly nights.
In Rock Springs in September, the precipitation amount is 20 mm (0.8 in) accumulated over a period of 3 days.
In Rock Springs in September humidity is 50%. With an average temperature of 16°C (61°F), this humidity feels like a comfortable embrace, making it ideal for traveling as it adds a refreshing quality to the cool air, allowing for enjoyable exploration without the discomfort of excessive heat.
In Rock Springs 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 Rock Springs.
UV Risk Categories
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.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (19°F) | 25 mm (1.0 inches) | 92% | moderate |
| February Weather | -6°C (21°F) | 26 mm (1.0 inches) | 93% | high |
| March Weather | -1°C (31°F) | 40 mm (1.6 inches) | 85% | high |
| April Weather | 5°C (41°F) | 39 mm (1.6 inches) | 73% | very high |
| May Weather | 11°C (52°F) | 47 mm (1.9 inches) | 64% | extreme |
| June Weather | 18°C (66°F) | 16 mm (0.6 inches) | 57% | extreme |
| July Weather | 23°C (73°F) | 9 mm (0.4 inches) | 45% | extreme |
| August Weather | 21°C (71°F) | 10 mm (0.4 inches) | 41% | extreme |
| September Weather | 16°C (61°F) | 20 mm (0.8 inches) | 50% | very high |
| October Weather | 6°C (43°F) | 24 mm (0.9 inches) | 70% | high |
| November Weather | 1°C (34°F) | 24 mm (0.9 inches) | 84% | moderate |
| December Weather | -6°C (22°F) | 24 mm (0.9 inches) | 90% | moderate |