Last updated: June 24, 2025
In Mount Morris, United States, the average temperature in September hovers around 20°C (67°F), but be prepared for variability—minimums can drop to 2°C (37°F) while maximums can soar to 34°C (93°F). This month sees an average precipitation of 120 mm (4.7 in), spread across about 10 days, and the air tends to be quite humid, with levels reaching 80%.
In September in Mount Morris, the average temperature is 20°C (67°F). Maximum temperatures can reach 34°C (93°F), while minimums can drop as low as 2°C (37°F). It's advisable to pack layers and be prepared for both warm days and cooler nights while traveling.
In Mount Morris in September, the precipitation amount is 120 mm (4.7 in) spread over a duration of 10 days.
In Mount Morris in September, humidity is 80%. With an average temperature of 20°C (67°F), this humidity feels like a warm embrace that can make outdoor activities feel sticky and heavy, potentially draining your energy as you explore.
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 | -5°C (23°F) | 59 mm (2.3 inches) | 82% | moderate |
| February Weather | -4°C (25°F) | 58 mm (2.3 inches) | 83% | moderate |
| March Weather | 4°C (39°F) | 81 mm (3.2 inches) | 84% | high |
| April Weather | 9°C (48°F) | 110 mm (4.3 inches) | 85% | very high |
| May Weather | 16°C (61°F) | 152 mm (6.0 inches) | 79% | very high |
| June Weather | 22°C (72°F) | 124 mm (4.9 inches) | 82% | very high |
| July Weather | 24°C (76°F) | 85 mm (3.3 inches) | 80% | very high |
| August Weather | 22°C (73°F) | 79 mm (3.1 inches) | 81% | very high |
| September Weather | 20°C (67°F) | 120 mm (4.7 inches) | 80% | very high |
| October Weather | 12°C (53°F) | 114 mm (4.5 inches) | 82% | high |
| November Weather | 3°C (38°F) | 49 mm (1.9 inches) | 88% | moderate |
| December Weather | 0°C (32°F) | 51 mm (2.0 inches) | 84% | low |