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Portland weather in September 2026
Expect daytime maximum temperatures of 70°F in Portland, Maine in September based on long-term weather averages. There are 7 hours of sunshine per day on average with typically 3.2 inches of rainfall in the month.
- 70°F max day temperature
70 - 7 hours of sunshine per day
- 9 days with some rainfall
9 - 50°F min night temperature
50 - 12 hours of daylight per day
12 - No heat & humidity
0 - 3.2 inches of monthly rainfall
3.2 - 5 (Moderate) UV index
5 - 59°F sea temperature
59
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Recommended for Maine
The September weather guide for Maine (Portland) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
Metric (°C) | Imperial (°F)
More about the USA
How hot is it in Portland in September?
Daytime temperatures usually reach 70°F in Portland in September, falling to 50°F at night.
How sunny is it in Portland in September?
There are normally 7 hours of bright sunshine each day in Portland in September - that's 59% of daylight hours.
How warm is the sea around Portland in September?
The average sea temperature around Portland in September is 59°F.
Does it rain in Portland in September?
There are usually 9 days with some rain in Portland in September and the average monthly rainfall is 3.2 inches.
What is the chance of a hurricane in Portland in September?
On average less than 1 day in September in Portland is likely to be affected by the passage of one or more tropical storms.
Portland September sunrise & sunset times
Browse the sunrise and sunset times for Portland in September 2026. Select a month to view Portland sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Tuesday, 1st September 2026 | 05:05 | 18:16 |
| Tuesday, 15th September 2026 | 05:20 | 17:51 |
| Wednesday, 30th September 2026 | 05:37 | 17:24 |
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