Last updated: June 24, 2025
In September, the average temperature in Cathlamet, United States hovers around 16°C (60°F), offering pleasant yet diverse weather conditions. You can expect a minimum of 6°C (44°F) and a peak of 29°C (84°F), allowing for both cool evenings and warm afternoons. However, be prepared for some rain, as the area receives about 91 mm (3.6 in) of precipitation over roughly 10 days. With an average humidity of 74%, it's a great time to enjoy the vibrant atmosphere while staying comfortable!
In September in Cathlamet, the average temperature is 16°C (60°F), with maximum highs reaching 29°C (84°F) and minimum lows dipping as low as 6°C (44°F). This makes it a perfect time for travelers to enjoy a comfortable climate while exploring the sights and activities that Cathlamet has to offer.
In Cathlamet in September, the precipitation amount totals 91 mm (3.6 in) over a span of 10 days.
In Cathlamet in September humidity is 74%. With an average temperature of 16°C (60°F), this humidity feels like a damp blanket enveloping you, making traveling a bit uncomfortable as you navigate the sticky air and potentially limiting your energy for exploring the sights.
In Cathlamet 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 Cathlamet.
UV Risk Categories
Weather in Cathlamet varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Cathlamet, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 6°C (42°F) | 214 mm (8.4 inches) | 86% | low |
| February Weather | 5°C (41°F) | 192 mm (7.5 inches) | 84% | moderate |
| March Weather | 7°C (45°F) | 149 mm (5.9 inches) | 85% | moderate |
| April Weather | 10°C (50°F) | 134 mm (5.3 inches) | 83% | high |
| May Weather | 12°C (55°F) | 74 mm (2.9 inches) | 84% | very high |
| June Weather | 15°C (59°F) | 62 mm (2.5 inches) | 84% | very high |
| July Weather | 16°C (62°F) | 11 mm (0.4 inches) | 82% | very high |
| August Weather | 17°C (63°F) | 12 mm (0.5 inches) | 73% | very high |
| September Weather | 16°C (60°F) | 91 mm (3.6 inches) | 74% | high |
| October Weather | 11°C (52°F) | 151 mm (5.9 inches) | 83% | moderate |
| November Weather | 8°C (46°F) | 212 mm (8.3 inches) | 86% | moderate |
| December Weather | 5°C (41°F) | 229 mm (9.0 inches) | 87% | low |