Last updated: June 24, 2025
In September, the average temperature in Rock Rapids, United States hovers around 18°C (65°F). However, be prepared for a range of conditions, with minimums dipping to 3°C (38°F) and highs reaching up to 32°C (91°F). Rainfall can be expected, with an average precipitation of 105 mm (4.1 in) spread over 8 days. Don't forget to account for the average humidity level of 75%, which can make the air feel warmer!
In September in Rock Rapids, the average temperature is 18°C (65°F). Maximums can reach 32°C (91°F) and minimums can be as low as 3°C (38°F). It's a great time for travelers to enjoy a mix of warm days and cooler nights, making it ideal for outdoor activities and sightseeing.
In Rock Rapids in September, the precipitation amount is 105 mm (4.1 in) over the course of 8 days.
In Rock Rapids in September, humidity is 75%. With an average temperature of 18°C (65°F), this humidity feels like a warm, enveloping blanket that can make outdoor exploration feel a bit stifling, potentially leading to discomfort during travel activities.
In Rock Rapids 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 Rapids.
UV Risk Categories
Weather in Rock Rapids varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Rock Rapids, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -7°C (20°F) | 24 mm (0.9 inches) | 80% | low |
| February Weather | -7°C (20°F) | 27 mm (1.1 inches) | 84% | moderate |
| March Weather | 1°C (35°F) | 65 mm (2.5 inches) | 75% | moderate |
| April Weather | 7°C (45°F) | 83 mm (3.3 inches) | 79% | very high |
| May Weather | 15°C (59°F) | 124 mm (4.9 inches) | 74% | very high |
| June Weather | 22°C (73°F) | 98 mm (3.9 inches) | 81% | extreme |
| July Weather | 24°C (75°F) | 80 mm (3.1 inches) | 82% | very high |
| August Weather | 22°C (71°F) | 97 mm (3.8 inches) | 80% | very high |
| September Weather | 18°C (65°F) | 105 mm (4.1 inches) | 75% | very high |
| October Weather | 9°C (48°F) | 85 mm (3.3 inches) | 77% | moderate |
| November Weather | 1°C (35°F) | 26 mm (1.0 inches) | 85% | moderate |
| December Weather | -3°C (26°F) | 38 mm (1.5 inches) | 83% | moderate |