Last updated: June 24, 2025
In September, the average temperature in Rock Valley, United States is a pleasant 19°C (66°F). Visitors can expect a minimum temperature of 4°C (39°F) and a maximum of 33°C (91°F). However, be prepared for some rain, as precipitation averages 100 mm (3.9 in) over approximately 8 days. The average humidity during this month is around 75%, making for a rather humid experience.
In September in Rock Valley, the average temperature is 19°C (66°F). Maximum temperatures can reach 33°C (91°F), while minimums can drop as low as 4°C (39°F). This makes Rock Valley an ideal destination for travelers seeking a pleasant climate with a range of temperatures.
In Rock Valley in September, the precipitation amount is 100 mm (3.9 in) spread over the course of 8 days.
In Rock Valley in September humidity is 75%. With an average temperature of 19°C (66°F), this humidity feels like a warm, enveloping blanket, making it slightly uncomfortable for traveling as you navigate through the thick, muggy air.
In Rock Valley 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 Rock Valley.
UV Risk Categories
Weather in Rock Valley varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Rock Valley, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (21°F) | 25 mm (1.0 inches) | 80% | low |
| February Weather | -7°C (20°F) | 29 mm (1.1 inches) | 84% | moderate |
| March Weather | 2°C (36°F) | 70 mm (2.7 inches) | 75% | moderate |
| April Weather | 7°C (45°F) | 92 mm (3.6 inches) | 79% | very high |
| May Weather | 15°C (60°F) | 133 mm (5.2 inches) | 74% | very high |
| June Weather | 23°C (73°F) | 101 mm (4.0 inches) | 81% | extreme |
| July Weather | 24°C (75°F) | 80 mm (3.2 inches) | 82% | very high |
| August Weather | 22°C (72°F) | 98 mm (3.9 inches) | 80% | very high |
| September Weather | 19°C (66°F) | 100 mm (3.9 inches) | 75% | very high |
| October Weather | 9°C (49°F) | 85 mm (3.3 inches) | 77% | moderate |
| November Weather | 2°C (35°F) | 27 mm (1.0 inches) | 85% | moderate |
| December Weather | -3°C (27°F) | 39 mm (1.5 inches) | 83% | moderate |