Last updated: June 24, 2025
In Jefferson, United States, the average temperature in September hovers around 24°C (75°F), creating a pleasant climate. However, temperatures can vary significantly, with a minimum of 9°C (48°F) and soaring up to a maximum of 35°C (95°F). Expect some rain during this month, with average precipitation totaling 139 mm (5.5 in) spread over approximately 9 days. The air is often quite humid, with an average humidity level of 75%, adding to the tropical feel.
In September in Jefferson, the average temperature is 24°C (75°F), with maximums reaching 35°C (95°F) and minimums dropping to 9°C (48°F). This diverse temperature range makes it advisable for travelers to pack both light clothing for the warm days and warmer layers for the cooler evenings.
In Jefferson in September, the total precipitation amount is 139 mm (5.5 in) over the course of 9 days.
In Jefferson in September humidity is 75%. With average temperature 24°C (75°F), this humidity feels like a thick blanket wrapping around you, making outdoor activities feel especially stifling and leaving you yearning for cool breezes and refreshingly cold drinks.
In Jefferson 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 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 | 7°C (46°F) | 96 mm (3.8 inches) | 86% | moderate |
| February Weather | 10°C (51°F) | 120 mm (4.7 inches) | 85% | high |
| March Weather | 13°C (55°F) | 82 mm (3.2 inches) | 84% | very high |
| April Weather | 17°C (63°F) | 108 mm (4.2 inches) | 82% | very high |
| May Weather | 22°C (72°F) | 119 mm (4.7 inches) | 83% | extreme |
| June Weather | 25°C (77°F) | 117 mm (4.6 inches) | 82% | extreme |
| July Weather | 27°C (80°F) | 118 mm (4.6 inches) | 80% | extreme |
| August Weather | 26°C (79°F) | 132 mm (5.2 inches) | 74% | very high |
| September Weather | 24°C (75°F) | 139 mm (5.5 inches) | 75% | very high |
| October Weather | 19°C (66°F) | 75 mm (2.9 inches) | 79% | very high |
| November Weather | 11°C (53°F) | 80 mm (3.2 inches) | 87% | high |
| December Weather | 9°C (49°F) | 131 mm (5.2 inches) | 87% | moderate |