Last updated: June 24, 2025
In Back Mountain, United States, the average temperature in September hovers around 18°C (65°F). While you might enjoy pleasant days, be prepared for temperatures that can dip as low as 2°C (36°F) or soar to a maximum of 31°C (89°F). Expect some rain too, with a total precipitation of 102 mm (4.0 in) spread over 9 days. On top of that, the average humidity sits at a comfortable 66%, making the climate feel just right for outdoor adventures!
In September, in Back Mountain, the average temperature is 18°C (65°F). Maximums can reach 31°C (89°F) and minimums can be as low as 2°C (36°F). This makes Back Mountain an ideal destination for travelers seeking a mild climate with the possibility of warm days and cool evenings.
In Back Mountain in September, the total precipitation amount is 102 mm (4.0 in) over a span of 9 days.
In Back Mountain in September humidity is 66%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace, making travel comfortable yet slightly sticky, perfect for leisurely strolls but requiring light, breathable clothing to fully enjoy the experience.
In Back Mountain 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 Back Mountain.
UV Risk Categories
Weather in Back Mountain varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Back Mountain, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (29°F) | 71 mm (2.8 inches) | 87% | moderate |
| February Weather | 0°C (32°F) | 96 mm (3.8 inches) | 85% | moderate |
| March Weather | 3°C (38°F) | 88 mm (3.5 inches) | 85% | high |
| April Weather | 9°C (49°F) | 102 mm (4.0 inches) | 83% | very high |
| May Weather | 15°C (60°F) | 122 mm (4.8 inches) | 75% | very high |
| June Weather | 20°C (68°F) | 95 mm (3.7 inches) | 73% | very high |
| July Weather | 23°C (74°F) | 118 mm (4.6 inches) | 65% | very high |
| August Weather | 22°C (72°F) | 121 mm (4.8 inches) | 62% | very high |
| September Weather | 18°C (65°F) | 102 mm (4.0 inches) | 66% | very high |
| October Weather | 13°C (55°F) | 114 mm (4.5 inches) | 79% | high |
| November Weather | 5°C (41°F) | 87 mm (3.4 inches) | 87% | moderate |
| December Weather | 1°C (34°F) | 83 mm (3.3 inches) | 85% | low |