Last updated: June 24, 2025
In September, the average temperature in Mount Morris, United States hovers around 17°C (64°F). Be prepared for a wide range of temperatures, with minimums dipping to 2°C (35°F) and maximums soaring up to 32°C (90°F). Expect approximately 72 mm (2.8 in) of precipitation spread across 8 days, contributing to an average humidity of 76%. Stay comfortable and enjoy the diverse weather!
In September, in Mount Morris, the average temperature is 17°C (64°F). The maximum can reach 32°C (90°F), while the minimum can drop as low as 2°C (35°F). Overall, it's a great time to visit for varied weather conditions and outdoor activities.
In Mount Morris in September, the precipitation amount is 72 mm (2.8 in) over the course of 8 days.
In Mount Morris in September, humidity is 76%. With an average temperature of 17°C (64°F), this humidity feels like a warm, sticky embrace that can make outdoor activities feel sluggish and draining, challenging travelers to stay hydrated and seek respite in shaded areas or air-conditioned spaces.
In Mount Morris 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 Mount Morris.
UV Risk Categories
Weather in Mount Morris varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Mount Morris, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (26°F) | 74 mm (2.9 inches) | 91% | moderate |
| February Weather | -2°C (28°F) | 80 mm (3.1 inches) | 91% | moderate |
| March Weather | 1°C (35°F) | 72 mm (2.8 inches) | 88% | high |
| April Weather | 7°C (46°F) | 107 mm (4.2 inches) | 88% | very high |
| May Weather | 14°C (58°F) | 113 mm (4.4 inches) | 82% | very high |
| June Weather | 19°C (67°F) | 84 mm (3.3 inches) | 79% | very high |
| July Weather | 22°C (72°F) | 127 mm (5.0 inches) | 77% | very high |
| August Weather | 21°C (70°F) | 83 mm (3.3 inches) | 72% | very high |
| September Weather | 17°C (64°F) | 72 mm (2.8 inches) | 76% | very high |
| October Weather | 12°C (53°F) | 131 mm (5.2 inches) | 83% | high |
| November Weather | 3°C (39°F) | 82 mm (3.2 inches) | 88% | moderate |
| December Weather | -1°C (31°F) | 86 mm (3.4 inches) | 87% | low |