Last updated: June 24, 2025
In Jefferson, United States, the average temperature in September hovers around 17°C (63°F), making it a pleasant time to visit. Temperatures can range from a chilly 1°C (35°F) to a warm 32°C (89°F), offering a diverse climate experience. Expect about 73 mm (2.9 in) of precipitation over 8 days, contributing to an average humidity of 77%. Whether you’re seeking warmth or a refreshing breeze, this month has something for everyone!
In September, in Jefferson, the average temperature is 17°C (63°F). The maximum can reach 32°C (89°F) and the minimum can be as low as 1°C (35°F). This diverse range in temperatures makes Jefferson an excellent destination for travelers looking to experience both warm and cool weather.
In Jefferson in September, the precipitation amount is 73 mm (2.9 in) over a span of 8 days.
In Jefferson in September, humidity is 77%. With an average temperature of 17°C (63°F), this humidity feels like a cozy blanket wrapped around you, creating a muggy atmosphere that can be a bit uncomfortable for traveling, making you want to seek shade and hydration as you explore.
In Jefferson 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 Jefferson.
UV Risk Categories
Weather in Jefferson varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Jefferson, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (25°F) | 88 mm (3.5 inches) | 88% | low |
| February Weather | -3°C (26°F) | 86 mm (3.4 inches) | 88% | moderate |
| March Weather | 0°C (33°F) | 72 mm (2.8 inches) | 85% | moderate |
| April Weather | 7°C (44°F) | 124 mm (4.9 inches) | 81% | high |
| May Weather | 12°C (55°F) | 80 mm (3.2 inches) | 76% | very high |
| June Weather | 18°C (65°F) | 64 mm (2.5 inches) | 74% | very high |
| July Weather | 21°C (71°F) | 105 mm (4.1 inches) | 74% | very high |
| August Weather | 21°C (70°F) | 77 mm (3.0 inches) | 74% | very high |
| September Weather | 17°C (63°F) | 73 mm (2.9 inches) | 77% | high |
| October Weather | 11°C (52°F) | 129 mm (5.1 inches) | 82% | moderate |
| November Weather | 3°C (38°F) | 109 mm (4.3 inches) | 85% | moderate |
| December Weather | -2°C (28°F) | 121 mm (4.8 inches) | 84% | low |