| < May >
|Normal Max/ High Temperature
|Min/ Low Temperature
|Number of Wet Days (probability of rain on a day)
|Average Sunlight per day
|Average Daylight per day
|Sunny (Cloudy) Daylight Hours
|Sun altitude at solar noon on the 21st day.
- The average temperature in Portland, Maine in May is quite mild at 11.8 °C (53.24 °F).
- Afternoons can be very mild with average high temperatures reaching 17.3 °C (63.1 °F).
- Overnight temperatures are generally cool with an average low of 6.3 °C (43.3 °F).
- In May the mean diurnal temperature variation/ range is 11 °C (19.8 °F).
- The weather in May is hardly arid with occasional rain. Circa 91.9mm (3.6in) of water is dropped during on average 13 days.
- In May the heavens above Portland, Maine are moderately sunny with on balance a respectable 8:27 of dazzling sunshine per day.
- The shortest day is 14:07 long and the longest day is 15:10 long with an average length of 14:41.
- There are approximately 6:04 per day when bright sunshine is absent due to cloud, haze or the sun being too low on the horizon to register.
- It is sunny approximately 58.2% of daylight hours and cloudy 41.8% of daylight hours.
Check the distance to and compare the Portland, Maine May averages with somewhere beginning with:
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Weather Trend Graph for May in Portland, Maine, Usa
Navigate to May Weather in Locations Surrounding Portland, Maine:
- Saint Johnsbury, Vt, Usa - 160.4 kms (99.7 miles) WNW
- Mount Washington, Nh, Usa - 104.4 kms (64.9 miles) NW
- Bethlehem, Nh, Usa - 140.5 kms (87.3 miles) WNW
- Hanover, Nh, Usa - 140.5 kms (87.3 miles) WNW
- Chelsea, Vt, Usa - 175.1 kms (108.8 miles) WNW
- Durham, Nh, Usa - 91 kms (56.5 miles) SW
- Keene, Nh, Usa - 154.2 kms (95.8 miles) WSW
- Lawrence, Ma, Usa - 91 kms (56.5 miles) SW
- Boston, Massachusetts, Usa - 154.1 kms (95.8 miles) SSW
- Framingham, Ma, Usa - 175.9 kms (109.3 miles) SSW
- Milton/ Blue Hill, Ma, Usa - 172.2 kms (107 miles) SSW