Last updated: June 24, 2025
In September, the average temperature in Williamston, United States is a pleasant 18°C (65°F), offering a comfortable climate for outdoor activities. Variability in temperature can range from a chilly 1°C (34°F) to a warm 34°C (94°F), providing some surprising shifts. Expect about 86 mm (3.4 in) of precipitation spread over 11 days, contributing to an average humidity of 80% that will keep the air feeling fresh and vibrant.
In September in Williamston, the average temperature is 18°C (65°F), with maximums reaching up to 34°C (94°F) and minimums dipping as low as 1°C (34°F). Be prepared for a range of temperatures during your travels, bringing both lightweight clothing for the heat and warmer layers for the cooler moments.
In Williamston in September, the precipitation amount is 86 mm (3.4 in), spread over 11 days.
In Williamston in September, humidity is 80%. With an average temperature of 18°C (65°F), this humidity feels like wandering through a warm, damp blanket, making every step slightly heavy and resulting in a constant sheen of sweat, which can be both refreshing and exhausting for travelers.
In Williamston 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 Williamston.
UV Risk Categories
Weather in Williamston varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Williamston, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (26°F) | 65 mm (2.5 inches) | 88% | low |
| February Weather | -3°C (27°F) | 67 mm (2.6 inches) | 87% | moderate |
| March Weather | 3°C (37°F) | 68 mm (2.7 inches) | 85% | moderate |
| April Weather | 8°C (47°F) | 90 mm (3.5 inches) | 86% | very high |
| May Weather | 15°C (60°F) | 119 mm (4.7 inches) | 80% | very high |
| June Weather | 21°C (70°F) | 106 mm (4.2 inches) | 80% | very high |
| July Weather | 24°C (75°F) | 84 mm (3.3 inches) | 80% | very high |
| August Weather | 22°C (72°F) | 69 mm (2.7 inches) | 80% | very high |
| September Weather | 18°C (65°F) | 86 mm (3.4 inches) | 80% | high |
| October Weather | 12°C (53°F) | 114 mm (4.5 inches) | 84% | moderate |
| November Weather | 4°C (39°F) | 67 mm (2.6 inches) | 89% | moderate |
| December Weather | 0°C (32°F) | 57 mm (2.3 inches) | 86% | low |