Last updated: June 24, 2025
In September, the average temperature in Fort Pierre, United States is a pleasant 19°C (66°F). However, be prepared for a temperature range that can dip to a chilly 3°C (38°F) or soar to a hot 36°C (97°F). With an average precipitation amount of 60 mm (2.3 in) over approximately 6 days, you might encounter a few showers. The overall average humidity sits at a comfortable 73%, making this month a balanced experience in terms of weather!
In September in Fort Pierre, the average temperature is 19°C (66°F). The maximum can reach 36°C (97°F), and the minimum can be as low as 3°C (38°F). It's a great time to visit if you enjoy mild weather with the possibility of hot days and cooler nights.
In Fort Pierre, in September, the precipitation amount is 60 mm (2.3 in) over a span of 6 days.
In Fort Pierre in September humidity is 73%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace, making travel enjoyable yet slightly sticky, as you find yourself seeking shade and refreshing drinks while exploring.
In Fort Pierre 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 Fort Pierre.
UV Risk Categories
Weather in Fort Pierre varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Fort Pierre, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -7°C (20°F) | 15 mm (0.6 inches) | 78% | low |
| February Weather | -7°C (19°F) | 19 mm (0.8 inches) | 81% | moderate |
| March Weather | 1°C (34°F) | 38 mm (1.5 inches) | 71% | moderate |
| April Weather | 7°C (44°F) | 49 mm (1.9 inches) | 73% | high |
| May Weather | 15°C (59°F) | 78 mm (3.1 inches) | 75% | very high |
| June Weather | 23°C (73°F) | 62 mm (2.4 inches) | 82% | very high |
| July Weather | 25°C (78°F) | 86 mm (3.4 inches) | 83% | very high |
| August Weather | 23°C (74°F) | 53 mm (2.1 inches) | 82% | very high |
| September Weather | 19°C (66°F) | 60 mm (2.3 inches) | 73% | very high |
| October Weather | 9°C (48°F) | 54 mm (2.1 inches) | 71% | moderate |
| November Weather | 2°C (36°F) | 11 mm (0.4 inches) | 78% | moderate |
| December Weather | -3°C (27°F) | 26 mm (1.0 inches) | 76% | low |