Portland Weather in September

In Portland, September brings pleasant daytime temperatures around 22°C (72°F), with nights cooling to 12°C (54°F). Expect quite a bit of rainfall this month.

Rainfall in Portland in September

You can expect rain on roughly 10 days based on historical data, averaging 103 mm (4.1 in) for the month. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Portland in September

In September, Portland gets pleasant temperatures, with highs of 22°C (72°F). Nights cool to around 12°C (54°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With overnight lows of 12°C (54°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Portland in September

There are approximately 228 hours of sunshine this month, resulting in mostly clear days.

Average water temperature in September

With water at 16°C (61°F), it's on the cooler side. Keen swimmers won't be put off, but those who prefer warm water may find it less enjoyable.

If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Portland.