Last updated: June 24, 2025
In Millheim, United States, the average temperature in September hovers around 18°C (65°F). However, be prepared for a chilly dip to a minimum of 2°C (36°F), while the mercury can soar to a maximum of 32°C (90°F). During this month, you can expect 125 mm (4.9 in) of precipitation spread over about 10 days, contributing to an average humidity of 67%. Enjoy the climatic diversity!
In September in Millheim, the average temperature is 18°C (65°F). The maximum can reach 32°C (90°F), and the minimum can be as low as 2°C (36°F). This wide range of temperatures makes it essential for travelers to pack both light clothing for warm days and warm layers for cooler nights.
In Millheim in September, the precipitation amount is 125 mm (4.9 in) spread over a period of 10 days.
In Millheim in September humidity is 67%. With an average temperature of 18°C (65°F), this humidity feels like a mild blanket wrapping around you, making outdoor activities feel pleasantly refreshing, yet you may find yourself reaching for a drink more often to stay hydrated while exploring the sights.
In Millheim 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 Millheim.
UV Risk Categories
Weather in Millheim varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Millheim, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (28°F) | 71 mm (2.8 inches) | 89% | moderate |
| February Weather | 0°C (31°F) | 104 mm (4.1 inches) | 90% | moderate |
| March Weather | 3°C (38°F) | 89 mm (3.5 inches) | 89% | high |
| April Weather | 9°C (49°F) | 112 mm (4.4 inches) | 88% | very high |
| May Weather | 15°C (60°F) | 136 mm (5.4 inches) | 80% | very high |
| June Weather | 20°C (68°F) | 107 mm (4.2 inches) | 79% | very high |
| July Weather | 23°C (74°F) | 137 mm (5.4 inches) | 74% | very high |
| August Weather | 22°C (72°F) | 107 mm (4.2 inches) | 64% | very high |
| September Weather | 18°C (65°F) | 125 mm (4.9 inches) | 67% | very high |
| October Weather | 13°C (55°F) | 120 mm (4.7 inches) | 81% | high |
| November Weather | 4°C (40°F) | 87 mm (3.4 inches) | 89% | moderate |
| December Weather | 1°C (34°F) | 93 mm (3.7 inches) | 88% | low |