Portland weather in August 2025

Expect 77°F 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.

  • 77°F maximum daytime temperature in August in Portland77
    77°F max day temperature
  • 8 hours of sunshine per day
  • 10 days with some rainfall in August in Portland10
    10 days with some rainfall
  • 57°F minimum night-time temperature in August in Portland57
    57°F min night temperature
  • 14 hours of daylight per day in August in Portland14
    14 hours of daylight per day
  • Low heat & humidity in August in PortlandL
    Low heat & humidity
  • 3.0 inches monthly rainfall in August in Portland3.0
    3.0 inches of monthly rainfall
  • UV (maximum) index 7 (High) in August in Portland7
    7 (High) UV index
  • 63°F sea temperature in August in Portland63
    63°F 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)  |  Imperial (°F)

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How hot is it in Portland in August?

Daytime temperatures usually reach 77°F in Portland in August with low heat and humidity, falling to 57°F 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 63°F.

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 3.0 inches.

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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