Last updated: June 24, 2025
In The Dalles, United States, the average temperature in September hovers around 17°C (63°F), providing a pleasantly mild climate. Expect a range of temperatures, with minimums dipping to 2°C (36°F) and maximums soaring up to 37°C (100°F). During this month, anticipate 34 mm (1.4 in) of precipitation spread out over about 5 days, ensuring the air remains refreshingly humid at an average of 59%.
In September in The Dalles, the average temperature is 17°C (63°F). Maximum temperatures can reach 37°C (100°F), while minimums can drop to as low as 2°C (36°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack layers for both warm days and cool nights.
In The Dalles in September, the precipitation amount is 34 mm (1.4 in) spread over 5 days.
In The Dalles in September, humidity is 59%. With an average temperature of 17°C (63°F), this humidity feels like a refreshing embrace, making it pleasant for traveling as long as you're prepared for occasional mugginess.
In The Dalles 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 The Dalles.
UV Risk Categories
Weather in The Dalles varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in The Dalles, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 1°C (34°F) | 112 mm (4.4 inches) | 86% | low |
| February Weather | 2°C (35°F) | 123 mm (4.8 inches) | 87% | moderate |
| March Weather | 5°C (41°F) | 75 mm (3.0 inches) | 86% | high |
| April Weather | 9°C (48°F) | 69 mm (2.7 inches) | 85% | high |
| May Weather | 14°C (57°F) | 31 mm (1.2 inches) | 80% | very high |
| June Weather | 18°C (64°F) | 22 mm (0.9 inches) | 82% | very high |
| July Weather | 22°C (71°F) | 2 mm (0.1 inches) | 78% | very high |
| August Weather | 22°C (72°F) | 4 mm (0.2 inches) | 62% | very high |
| September Weather | 17°C (63°F) | 34 mm (1.4 inches) | 59% | very high |
| October Weather | 10°C (50°F) | 58 mm (2.3 inches) | 78% | moderate |
| November Weather | 5°C (41°F) | 93 mm (3.6 inches) | 88% | moderate |
| December Weather | 1°C (35°F) | 118 mm (4.6 inches) | 88% | low |