Last updated: June 24, 2025
In September, the average temperature in Mountain Lake Park, United States is a comfortable 18°C (64°F), with lows dipping to 2°C (37°F) and highs reaching up to 29°C (85°F). Expect about 120 mm (4.7 in) of precipitation spread over 11 days, accompanied by a pleasant average humidity of 68%. Whether you're exploring the outdoors or enjoying local culture, this month offers a delightful climate for every activity!
In September in Mountain Lake Park, the average temperature is 18°C (64°F). Maximums can reach 29°C (85°F), while minimums can drop as low as 2°C (37°F). This variation makes it essential for travelers to pack for both warm days and cooler nights.
In Mountain Lake Park in September, the precipitation amount is 120 mm (4.7 in) during a span of 11 days.
In Mountain Lake Park in September, humidity is 68%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making for a slightly muggy experience that can leave you feeling sticky as you explore, so it’s best to stay hydrated and take frequent breaks in the shade.
In Mountain Lake Park 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 Mountain Lake Park.
UV Risk Categories
Weather in Mountain Lake Park varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Mountain Lake Park, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (29°F) | 98 mm (3.8 inches) | 86% | moderate |
| February Weather | 1°C (34°F) | 153 mm (6.0 inches) | 86% | moderate |
| March Weather | 4°C (39°F) | 124 mm (4.9 inches) | 86% | high |
| April Weather | 9°C (49°F) | 156 mm (6.1 inches) | 84% | very high |
| May Weather | 15°C (59°F) | 171 mm (6.7 inches) | 78% | very high |
| June Weather | 19°C (66°F) | 152 mm (6.0 inches) | 79% | very high |
| July Weather | 21°C (71°F) | 116 mm (4.6 inches) | 70% | very high |
| August Weather | 20°C (69°F) | 114 mm (4.5 inches) | 59% | very high |
| September Weather | 18°C (64°F) | 120 mm (4.7 inches) | 68% | very high |
| October Weather | 12°C (54°F) | 118 mm (4.7 inches) | 80% | high |
| November Weather | 4°C (40°F) | 92 mm (3.6 inches) | 86% | moderate |
| December Weather | 1°C (34°F) | 131 mm (5.2 inches) | 85% | moderate |