Last updated: June 24, 2025
In Bloomington, United States, the average temperature in September hovers around 19°C (66°F), with a minimum of 4°C (40°F) and a potential high of 33°C (92°F). Expect about 118 mm (4.7 in) of precipitation spread over 11 days, contributing to an average humidity level of 74%. Be prepared for a mix of warm days and cool nights!
In September in Bloomington, the average temperature is 19°C (66°F). Maximums can reach 33°C (92°F), and minimums can be as low as 4°C (40°F). This climate makes Bloomington an ideal destination for travelers looking to experience mild conditions with the possibility of warmer days.
In Bloomington in September, the precipitation amount is 118 mm (4.7 in) over the course of 11 days.
In Bloomington in September humidity is 74%. With an average temperature of 19°C (66°F), this humidity feels like a warm, enveloping blanket, making it ideal for leisurely outdoor exploration but potentially heavy for those not accustomed to tropical conditions.
In Bloomington 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 Bloomington.
UV Risk Categories
Weather in Bloomington varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Bloomington, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (21°F) | 43 mm (1.7 inches) | 84% | moderate |
| February Weather | -5°C (23°F) | 55 mm (2.2 inches) | 85% | moderate |
| March Weather | 3°C (37°F) | 60 mm (2.3 inches) | 84% | moderate |
| April Weather | 8°C (47°F) | 81 mm (3.2 inches) | 83% | very high |
| May Weather | 16°C (60°F) | 138 mm (5.4 inches) | 75% | very high |
| June Weather | 22°C (72°F) | 131 mm (5.1 inches) | 79% | very high |
| July Weather | 24°C (75°F) | 114 mm (4.5 inches) | 75% | very high |
| August Weather | 22°C (72°F) | 90 mm (3.5 inches) | 69% | very high |
| September Weather | 19°C (66°F) | 118 mm (4.7 inches) | 74% | very high |
| October Weather | 11°C (51°F) | 127 mm (5.0 inches) | 79% | moderate |
| November Weather | 2°C (37°F) | 48 mm (1.9 inches) | 88% | moderate |
| December Weather | -2°C (29°F) | 40 mm (1.6 inches) | 82% | low |