Cool
Average highs are around 15°C, so pack for cooler days.
May verdict
Isle of Portland, United Kingdom in May
Weather score33Poor
Poor for holiday weather
Average highs are around 15°C, so pack for cooler days. Sunshine averages 7.1h per day, enough for a balanced month. Rainfall averages 55mm, which is relatively low for holiday planning.
May weather
Monthly averages
Temp
15°C
Rain
55mm
Sun
7.1h
Sea
11°C
Weather score
33
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 55mm, which is relatively low for holiday planning.
Some sun
Sunshine averages 7.1h per day, enough for a balanced month.
Cool sea
Sea temperatures average 11°C, so the water can feel cool.
Map
Weather map
Compare Isle of Portland, United Kingdom with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
May15°C average high
May is close to Isle of Portland's yearly temperature average, giving a typical read on daytime heat.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
May55mm average rain
May sits on the drier side of Isle of Portland's year, which helps with sightseeing and transfers.
Driest monthsFebruary to September
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
May7.1 hours average sun
May is one of Isle of Portland's sunniest months, with some of the strongest bright-day conditions in the yearly averages.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
May11°C average sea
May is below Isle of Portland's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaJuly to October
Sea temperatures are usually near 16°C in this stretch, so swimming comfort is at its strongest.
Weather score
May33 weather score
May sits close to Isle of Portland's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.
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