Portland weather in May 2019

  • 18°C maximum daytime temperature in May in Portland18
    18°C max day temperature
  • 8 hours of sunshine per day
  • 12 days with some rainfall in May in Portland12
    12 days with some rainfall
  • 6°C minimum night-time temperature in May in Portland6
    6°C min night temperature
  • 15 hours of daylight per day in May in Portland15
    15 hours of daylight per day
  • No heat & humidity in May in Portland0
    No heat & humidity
  • 92 mm monthly rainfall in May in Portland92
    92 mm of monthly rainfall
  • UV (maximum) index 7 (High) in May in Portland7
    7 (High) UV index
  • 8°C sea temperature in May in Portland8
    8°C sea temperature

Going to Portland? Find the best month to visit Portland based on the weather.

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Expect 18°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Portland in May. Check more long-term weather averages for Portland in May before you book your next holiday to Maine in 2019/2020.

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More about Portland

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The May weather guide for Portland, Maine 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)

Guide to Portland weather in May

The average maximum daytime temperature in Portland in May is a comfortable 18°C (64°F). The average night-time temperature is usually a cold 6°C (43°F). There are usually 8 hours of bright sunshine each day, which represents 52% of the 15 hours of daylight.

Expect 92mm (3.6 inches) of rainfall across the whole of May with 12 days with some rain falling. Maximum UV levels will be high (7 UV index) at midday when the skies are clear.

The average sea temperature in and around Portland in May is 8°C (46°F).

Portland sunrise & sunset times for May 2019

Browse the sunrise & sunset times for Portland in May 2019. Select a month to view Portland sunrise & sunset times for the next twelve months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Wednesday, 1st May 2019 05:34 19:43
Thursday, 2nd May 2019 05:32 19:44
Friday, 3rd May 2019 05:31 19:46
Saturday, 4th May 2019 05:30 19:47
Sunday, 5th May 2019 05:28 19:48
Monday, 6th May 2019 05:27 19:49
Tuesday, 7th May 2019 05:26 19:50
Wednesday, 8th May 2019 05:24 19:51
Thursday, 9th May 2019 05:23 19:53
Friday, 10th May 2019 05:22 19:54
Saturday, 11th May 2019 05:21 19:55
Sunday, 12th May 2019 05:20 19:56
Monday, 13th May 2019 05:18 19:57
Tuesday, 14th May 2019 05:17 19:58
Wednesday, 15th May 2019 05:16 19:59
Thursday, 16th May 2019 05:15 20:00
Friday, 17th May 2019 05:14 20:01
Saturday, 18th May 2019 05:13 20:02
Sunday, 19th May 2019 05:12 20:03
Monday, 20th May 2019 05:11 20:05
Tuesday, 21st May 2019 05:10 20:06
Wednesday, 22nd May 2019 05:09 20:07
Thursday, 23rd May 2019 05:09 20:08
Friday, 24th May 2019 05:08 20:08
Saturday, 25th May 2019 05:07 20:09
Sunday, 26th May 2019 05:06 20:10
Monday, 27th May 2019 05:06 20:11
Tuesday, 28th May 2019 05:05 20:12
Wednesday, 29th May 2019 05:04 20:13
Thursday, 30th May 2019 05:04 20:14
Friday, 31st May 2019 05:03 20:15
  • Save up to 40% on hotels & holidays this May
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