Last updated: June 24, 2025
In September, the average temperature in Three Forks, United States hovers around 15°C (59°F), offering a delightful mix of mild weather. However, be prepared for temperature fluctuations as the minimum can drop to -2°C (28°F), while the maximum may soar to 36°C (98°F). With precipitation amounting to 31 mm (1.2 in) over approximately 5 days, and an average humidity of 67%, it's wise to plan accordingly for both sun and occasional rain!
In September, in Three Forks, the average temperature is 15°C (59°F), with maximums reaching up to 36°C (98°F) and minimums dropping as low as -2°C (28°F). This wide temperature range makes Three Forks a destination where travelers should be prepared for both warm days and chilly nights.
In Three Forks in September, the precipitation amount is 31 mm (1.2 in) spread over 5 days.
In Three Forks in September, humidity is 67%. With an average temperature of 15°C (59°F), this humidity feels like a mild, damp embrace, which can make traveling feel refreshing yet slightly uncomfortable; you'll want to dress in breathable fabrics for an enjoyable experience.
In Three Forks in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Three Forks.
UV Risk Categories
Weather in Three Forks varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Three Forks, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (21°F) | 18 mm (0.7 inches) | 93% | moderate |
| February Weather | -7°C (19°F) | 43 mm (1.7 inches) | 92% | moderate |
| March Weather | 0°C (33°F) | 27 mm (1.1 inches) | 89% | high |
| April Weather | 5°C (41°F) | 54 mm (2.1 inches) | 83% | very high |
| May Weather | 11°C (52°F) | 57 mm (2.2 inches) | 79% | very high |
| June Weather | 17°C (62°F) | 64 mm (2.5 inches) | 76% | extreme |
| July Weather | 21°C (71°F) | 13 mm (0.5 inches) | 74% | very high |
| August Weather | 20°C (69°F) | 21 mm (0.8 inches) | 69% | very high |
| September Weather | 15°C (59°F) | 31 mm (1.2 inches) | 67% | very high |
| October Weather | 5°C (42°F) | 32 mm (1.2 inches) | 72% | moderate |
| November Weather | 0°C (32°F) | 27 mm (1.1 inches) | 89% | moderate |
| December Weather | -4°C (24°F) | 23 mm (0.9 inches) | 94% | low |