Last updated: June 24, 2025
In Belle Plaine, United States, the average temperature in September hovers around 18°C (65°F). Expect a range where the minimum dips to 2°C (36°F) and the maximum can soar to 33°C (91°F). During this month, you'll encounter approximately 128 mm (5.0 in) of precipitation over about 9 days, accompanied by an average humidity level of 81%.
In September in Belle Plaine, the average temperature is 18°C (65°F), with maximums reaching 33°C (91°F) and minimums dropping as low as 2°C (36°F). This makes Belle Plaine an ideal destination for travelers seeking a mix of comfortable days and cooler evenings.
In Belle Plaine in September, the precipitation amount is 128 mm (5.0 in) over a span of 9 days.
In Belle Plaine in September, humidity is 81%. With an average temperature of 18°C (65°F), this humidity feels like a thick blanket wrapping around you, making every step feel heavier and the air thick and sultry—a challenging environment for traveling.
In Belle Plaine 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 Belle Plaine.
UV Risk Categories
Weather in Belle Plaine varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Belle Plaine, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -9°C (17°F) | 32 mm (1.3 inches) | 87% | moderate |
| February Weather | -9°C (16°F) | 34 mm (1.3 inches) | 90% | moderate |
| March Weather | 1°C (33°F) | 64 mm (2.5 inches) | 85% | moderate |
| April Weather | 6°C (44°F) | 84 mm (3.3 inches) | 84% | very high |
| May Weather | 15°C (59°F) | 129 mm (5.1 inches) | 78% | very high |
| June Weather | 22°C (72°F) | 95 mm (3.8 inches) | 80% | very high |
| July Weather | 23°C (75°F) | 111 mm (4.4 inches) | 81% | very high |
| August Weather | 21°C (71°F) | 141 mm (5.6 inches) | 81% | very high |
| September Weather | 18°C (65°F) | 128 mm (5.0 inches) | 81% | very high |
| October Weather | 9°C (49°F) | 87 mm (3.4 inches) | 84% | moderate |
| November Weather | 1°C (34°F) | 33 mm (1.3 inches) | 88% | moderate |
| December Weather | -5°C (24°F) | 45 mm (1.8 inches) | 84% | low |