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Portland weather in August 2025
Expect 25°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Portland in August. Check more long-term weather averages for Portland in August before you book your next holiday to Maine in 2025/2026.
- 2525°C max day temperature
- 8 hours of sunshine per day
- 1010 days with some rainfall
- 1414°C min night temperature
- 1414 hours of daylight per day
- LLow heat & humidity
- 7575 mm of monthly rainfall
- 77 (High) UV index
- 1717°C sea temperature
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The August 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 / mm) | Imperial (°F / inches)
More about the USA
How hot is it in Portland in August?
Daytime temperatures usually reach 25°C in Portland in August with low heat and humidity, falling to 14°C at night.
How sunny is it in Portland in August?
There are normally 8 hours of bright sunshine each day in Portland in August - that's 60% of daylight hours.
How warm is the sea around Portland in August?
The average sea temperature around Portland in August is 17°C.
Does it rain in Portland in August?
There are usually 10 days with some rain in Portland in August and the average monthly rainfall is 75mm.
What is the chance of a hurricane in Portland in August?
On average less than 1 day in August in Portland is likely to be affected by the passage of one or more tropical storms.
Portland August sunrise & sunset times
Browse the sunrise and sunset times for Portland in August 2025. Select a month to view Portland sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Friday, 1st August 2025 | 04:30 | 19:04 |
Saturday, 16th August 2025 | 04:47 | 18:43 |
Sunday, 31st August 2025 | 05:04 | 18:18 |
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