Last updated: June 24, 2025
In West Branch, United States, the average temperature in September hovers around 16°C (62°F). Temperatures can swing significantly, with minimums dipping to -1°C (31°F) and maximums soaring to 34°C (94°F). Expect 75 mm (3.0 in) of precipitation spread over approximately 10 days, accompanied by an average humidity of 79%.
In September in West Branch, the average temperature is 16°C (62°F). Maximum temperatures can reach up to 34°C (94°F), while minimums can drop as low as -1°C (31°F). This variability in weather conditions makes West Branch an ideal destination for travelers seeking a diverse climate experience.
In West Branch in September, the precipitation amount is 75 mm (3.0 in) spread over a duration of 10 days.
In West Branch in September, humidity is 79%. With an average temperature of 16°C (62°F), this humidity feels like a warm, enveloping blanket that makes walking outdoors feel languid and heavy, demanding frequent breaks and plenty of water as you navigate the bustling streets.
In West Branch 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 West Branch.
UV Risk Categories
Weather in West Branch varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in West Branch, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (22°F) | 50 mm (2.0 inches) | 92% | low |
| February Weather | -6°C (22°F) | 51 mm (2.0 inches) | 91% | moderate |
| March Weather | 0°C (32°F) | 54 mm (2.1 inches) | 87% | moderate |
| April Weather | 6°C (43°F) | 93 mm (3.6 inches) | 85% | very high |
| May Weather | 13°C (56°F) | 110 mm (4.3 inches) | 79% | very high |
| June Weather | 19°C (66°F) | 108 mm (4.2 inches) | 75% | very high |
| July Weather | 22°C (72°F) | 91 mm (3.6 inches) | 75% | very high |
| August Weather | 20°C (69°F) | 91 mm (3.6 inches) | 75% | very high |
| September Weather | 16°C (62°F) | 75 mm (3.0 inches) | 79% | high |
| October Weather | 10°C (50°F) | 122 mm (4.8 inches) | 85% | moderate |
| November Weather | 2°C (36°F) | 58 mm (2.3 inches) | 88% | moderate |
| December Weather | -2°C (28°F) | 60 mm (2.4 inches) | 89% | low |