Last updated: June 24, 2025
In Gresham, United States, the average temperature in September hovers around 16°C (62°F). However, temperatures can vary significantly, reaching a minimum of 1°C (34°F) and soaring up to a maximum of 33°C (91°F). Expect 77 mm (3.0 in) of precipitation over approximately 11 days, contributing to an average humidity of 78%. Prepare for a month of delightful contrasts!
In September in Gresham, the average temperature is 16°C (62°F), with maximums reaching up to 33°C (91°F) and minimums dropping as low as 1°C (34°F). This variability in temperature makes Gresham an ideal destination for travelers looking to experience a mix of warm and cooler weather during their visit.
In Gresham in September, the precipitation amount is 77 mm (3.0 in) over the course of 11 days.
In Gresham in September, humidity is 78%. With an average temperature of 16°C (62°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities enjoyable yet slightly sticky. Travelers may find the weather pleasantly mild, though they'll appreciate having light, breathable clothing on hand to stay comfortable while exploring.
In Gresham 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 Gresham.
UV Risk Categories
Weather in Gresham varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Gresham, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -7°C (19°F) | 37 mm (1.5 inches) | 89% | low |
| February Weather | -7°C (19°F) | 49 mm (1.9 inches) | 90% | moderate |
| March Weather | 0°C (32°F) | 59 mm (2.3 inches) | 87% | moderate |
| April Weather | 6°C (43°F) | 101 mm (4.0 inches) | 84% | high |
| May Weather | 14°C (57°F) | 106 mm (4.2 inches) | 77% | very high |
| June Weather | 20°C (68°F) | 107 mm (4.2 inches) | 75% | very high |
| July Weather | 22°C (72°F) | 111 mm (4.4 inches) | 74% | very high |
| August Weather | 20°C (69°F) | 115 mm (4.5 inches) | 73% | very high |
| September Weather | 16°C (62°F) | 77 mm (3.0 inches) | 78% | high |
| October Weather | 9°C (49°F) | 100 mm (3.9 inches) | 84% | moderate |
| November Weather | 1°C (34°F) | 50 mm (2.0 inches) | 89% | moderate |
| December Weather | -4°C (25°F) | 55 mm (2.2 inches) | 87% | low |