Portland Weather in September

In Portland, September brings pleasant daytime temperatures around 19°C (66°F), with nights cooling to 14°C (57°F). Expect quite a bit of rainfall this month.

Rainfall in Portland in September

Based on our climate data of the past 30 years, about 13 days of rain are anticipated, with 73 mm (2.9 in) on average. Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.

Temperature in Portland in September

Portland in September gets highs of 19°C (66°F) during the day and drops to 14°C (57°F) at night. The summer season takes place during September. This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. Nights drop to around 14°C (57°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.

Sunshine in Portland in September

You can expect a moderate amount of sunlight, with approximately 152 hours. This means a pleasant mix of sun and overcast.

For Portland itself, August generally stands out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.