Tillamook Weather in September

The climate in Tillamook during September can be summarized as mild and a little damp.

September is in the fall / autumn in Tillamook and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around 19°C (67°F), whilst at night 7°C (45°F) is normal.

On average September is the 4th driest month of the year in Tillamook with around 84mm 3.3 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.2 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Tillamook in September 2025.