Last updated: June 24, 2025
In Mount Morris, United States, the average temperature in September hovers around 17°C (63°F), with temperatures ranging from a chilly 1°C (33°F) to a warm 33°C (91°F). Expect 90 mm (3.6 in) of precipitation over about 10 days, creating a humid environment with an average humidity of 79%. Whether you're planning outdoor activities or exploring indoor options, be prepared for varied weather conditions!
In September in Mount Morris, the average temperature is 17°C (63°F). The maximum can reach 33°C (91°F), while the minimum can dip as low as 1°C (33°F). This climate makes Mount Morris a great destination for travelers seeking mild weather, with opportunities for both warm and cool experiences.
In Mount Morris in September, the precipitation amount is 90 mm (3.6 in) spread over the course of 10 days.
In Mount Morris in September, humidity is 79%. With an average temperature of 17°C (63°F), this humidity feels like a warm, muggy embrace, making outdoor activities less comfortable and prompting travelers to seek shaded areas or cool refreshments more frequently.
In Mount Morris in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check 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 | -7°C (20°F) | 43 mm (1.7 inches) | 85% | moderate |
| February Weather | -6°C (21°F) | 52 mm (2.0 inches) | 85% | moderate |
| March Weather | 1°C (34°F) | 63 mm (2.5 inches) | 85% | moderate |
| April Weather | 7°C (44°F) | 100 mm (3.9 inches) | 85% | very high |
| May Weather | 14°C (58°F) | 111 mm (4.4 inches) | 78% | very high |
| June Weather | 21°C (69°F) | 111 mm (4.4 inches) | 80% | very high |
| July Weather | 23°C (74°F) | 123 mm (4.8 inches) | 78% | very high |
| August Weather | 21°C (70°F) | 116 mm (4.6 inches) | 76% | very high |
| September Weather | 17°C (63°F) | 90 mm (3.6 inches) | 79% | high |
| October Weather | 10°C (50°F) | 102 mm (4.0 inches) | 83% | moderate |
| November Weather | 2°C (35°F) | 47 mm (1.9 inches) | 88% | moderate |
| December Weather | -3°C (27°F) | 49 mm (1.9 inches) | 81% | low |