Last updated: June 24, 2025
In September, the average temperature in Grand Forks Air Force Base, United States hovers around 15°C (59°F). While you might experience a brisk minimum of -2°C (28°F), the warmth can peak at a balmy 33°C (91°F). Be prepared for some rain, as the area receives an average precipitation of 77 mm (3.0 in) across 8 days. With an average humidity level of 72%, the weather can feel quite muggy at times.
In September in Grand Forks Air Force Base, the average temperature is 15°C (59°F). Maximums can reach 33°C (91°F), and minimums can be as low as -2°C (28°F). This variation in temperature makes it essential to pack layers and prepare for diverse weather conditions while traveling.
In Grand Forks Air Force Base in September, the precipitation amount is 77 mm (3.0 in) distributed over 8 days.
In Grand Forks Air Force Base in September humidity is 72%. With an average temperature of 15°C (59°F), this humidity feels like a warm blanket wrapping around you, creating a sultry atmosphere that can make traveling a bit uncomfortable. The stickiness in the air can leave you feeling sluggish, so it’s advisable to stay hydrated and take breaks often while exploring.
In Grand Forks Air Force Base 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 Grand Forks Air Force Base.
UV Risk Categories
Weather in Grand Forks Air Force Base varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Grand Forks Air Force Base, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -13°C (10°F) | 17 mm (0.7 inches) | 87% | low |
| February Weather | -14°C (8°F) | 19 mm (0.7 inches) | 89% | moderate |
| March Weather | -4°C (26°F) | 24 mm (0.9 inches) | 82% | moderate |
| April Weather | 3°C (38°F) | 34 mm (1.3 inches) | 79% | high |
| May Weather | 13°C (55°F) | 54 mm (2.1 inches) | 74% | very high |
| June Weather | 20°C (68°F) | 73 mm (2.9 inches) | 78% | very high |
| July Weather | 22°C (72°F) | 61 mm (2.4 inches) | 76% | very high |
| August Weather | 20°C (68°F) | 73 mm (2.9 inches) | 77% | very high |
| September Weather | 15°C (59°F) | 77 mm (3.0 inches) | 72% | high |
| October Weather | 6°C (43°F) | 82 mm (3.2 inches) | 74% | moderate |
| November Weather | -3°C (27°F) | 24 mm (1.0 inches) | 85% | moderate |
| December Weather | -9°C (17°F) | 35 mm (1.4 inches) | 84% | low |