Last updated: June 24, 2025
In September, the average temperature in Brookfield, United States hovers around 18°C (64°F), making it a pleasant time of year. However, you can expect a range of temperatures, with minimums dipping to 2°C (35°F) and maximums soaring to 33°C (91°F). Don’t forget your umbrella, as precipitation averages around 73 mm (2.9 in) over the course of 7 days, and the air stays comfortably moist with an average humidity of 71%.
In September in Brookfield, the average temperature is 18°C (64°F). Maximums can reach 33°C (91°F), and minimums can be as low as 2°C (35°F). It's advisable to pack layers to accommodate the warm days and cooler nights when traveling during this time.
In Brookfield in September, the precipitation amount is 73 mm (2.9 in) during a span of 7 days.
In Brookfield in September, humidity is 71%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making traveling a bit sticky but still pleasant as the warmth envelops you, urging you to explore the vibrant surroundings while staying hydrated.
In Brookfield in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Brookfield.
UV Risk Categories
Weather in Brookfield varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Brookfield, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (24°F) | 79 mm (3.1 inches) | 86% | moderate |
| February Weather | -3°C (27°F) | 89 mm (3.5 inches) | 84% | moderate |
| March Weather | 1°C (33°F) | 80 mm (3.2 inches) | 82% | moderate |
| April Weather | 7°C (45°F) | 132 mm (5.2 inches) | 80% | very high |
| May Weather | 14°C (57°F) | 77 mm (3.0 inches) | 72% | very high |
| June Weather | 19°C (67°F) | 93 mm (3.7 inches) | 72% | very high |
| July Weather | 22°C (72°F) | 153 mm (6.0 inches) | 67% | very high |
| August Weather | 22°C (71°F) | 87 mm (3.4 inches) | 66% | very high |
| September Weather | 18°C (64°F) | 73 mm (2.9 inches) | 71% | high |
| October Weather | 11°C (52°F) | 126 mm (5.0 inches) | 78% | moderate |
| November Weather | 3°C (38°F) | 111 mm (4.4 inches) | 84% | moderate |
| December Weather | -2°C (29°F) | 125 mm (4.9 inches) | 81% | low |