Last updated: June 24, 2025
In September, the average temperature in Montrose, United States is a pleasant 18°C (64°F). You'll experience a range of temperatures with a minimum dropping to 1°C (34°F) and soaring up to 32°C (90°F). While the weather is generally comfortable, be prepared for occasional rain, with an average precipitation of 93 mm (3.7 in) spread over about 8 days. The air can feel a bit humid, with an average humidity level of 66%.
In September in Montrose, the average temperature is 18°C (64°F). Maximum temperatures can reach up to 32°C (90°F), while minimum temperatures can drop as low as 1°C (34°F). Be prepared for a wide range of weather conditions if you plan to travel during this time.
In Montrose in September, the total precipitation amount is 93 mm (3.7 in) over the course of 8 days.
In Montrose in September humidity is 66%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace that can make outdoor activities slightly uncomfortable if you aren't properly hydrated. Travelers might find themselves longing for shade and refreshing drinks as they explore, but the pleasant temperatures still allow for enjoyable adventures with the right precautions.
In Montrose 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 Montrose.
UV Risk Categories
Weather in Montrose varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Montrose, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (28°F) | 70 mm (2.8 inches) | 87% | moderate |
| February Weather | -1°C (30°F) | 86 mm (3.4 inches) | 85% | moderate |
| March Weather | 2°C (36°F) | 87 mm (3.4 inches) | 85% | high |
| April Weather | 8°C (47°F) | 109 mm (4.3 inches) | 83% | very high |
| May Weather | 15°C (59°F) | 132 mm (5.2 inches) | 75% | very high |
| June Weather | 20°C (67°F) | 95 mm (3.8 inches) | 73% | very high |
| July Weather | 23°C (73°F) | 113 mm (4.5 inches) | 65% | very high |
| August Weather | 21°C (71°F) | 106 mm (4.2 inches) | 62% | very high |
| September Weather | 18°C (64°F) | 93 mm (3.7 inches) | 66% | very high |
| October Weather | 12°C (54°F) | 127 mm (5.0 inches) | 79% | high |
| November Weather | 4°C (40°F) | 91 mm (3.6 inches) | 87% | moderate |
| December Weather | 0°C (33°F) | 83 mm (3.3 inches) | 85% | low |