Last updated: June 24, 2025
In September, the average temperature in Suffolk, United States is a pleasant 23°C (75°F), with a minimum dropping to 11°C (51°F) and occasionally rising to a sweltering 36°C (96°F). Expect around 130 mm (5.1 in) of precipitation over 12 days, contributing to an average humidity level of 78%. Whether you're soaking up the sun or enjoying the refreshing breeze, this month offers a delightful climate for all!
In September in Suffolk, the average temperature is 23°C (75°F), with maximums reaching as high as 36°C (96°F) and minimums dropping to a cool 11°C (51°F). It's a perfect time for travelers to enjoy a warm climate while being prepared for cooler evenings.
In Suffolk in September, the precipitation amount is 130 mm (5.1 in) over a span of 12 days.
In Suffolk in September, humidity is 78%. With an average temperature of 23°C (75°F), this humidity feels like a warm, heavy blanket wrapping around you, making outdoor adventures sticky and potentially draining. Travelers may find themselves needing frequent breaks, staying hydrated, and opting for lighter clothing to cope with the muggy conditions.
In Suffolk in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Suffolk.
UV Risk Categories
Weather in Suffolk varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Suffolk, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 6°C (42°F) | 91 mm (3.6 inches) | 84% | moderate |
| February Weather | 8°C (47°F) | 102 mm (4.0 inches) | 83% | high |
| March Weather | 11°C (51°F) | 84 mm (3.3 inches) | 82% | very high |
| April Weather | 16°C (61°F) | 101 mm (4.0 inches) | 81% | very high |
| May Weather | 20°C (69°F) | 120 mm (4.7 inches) | 80% | very high |
| June Weather | 24°C (76°F) | 118 mm (4.6 inches) | 82% | very high |
| July Weather | 27°C (81°F) | 140 mm (5.5 inches) | 81% | extreme |
| August Weather | 26°C (79°F) | 168 mm (6.6 inches) | 81% | very high |
| September Weather | 23°C (75°F) | 130 mm (5.1 inches) | 78% | very high |
| October Weather | 19°C (66°F) | 84 mm (3.3 inches) | 80% | very high |
| November Weather | 11°C (52°F) | 76 mm (3.0 inches) | 84% | moderate |
| December Weather | 8°C (47°F) | 89 mm (3.5 inches) | 84% | moderate |