Cool
Average highs are around 20°C, so pack for cooler days.
Weather Guide
Isle of Portland, United Kingdom Average Monthly Weather
Weather score29Poor annual avg
Best months: July, August, June
Across the year, average daytime temperatures are around 14°C, sunshine averages 4.7h per day, and rainfall totals about 819mm. Sea temperatures average 13°C across the year.
Annual weather
Annual averages
Temp
14°C
Rain
819mm
Annual total
Sun
4.7h
Sea
13°C
Weather score
29
Poor avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 59mm, which is relatively low for holiday planning.
Some sun
Sunshine averages 6.7h per day, enough for a balanced month.
Cool sea
Sea temperatures average 17°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
August20°C average high
August is one of Isle of Portland's hottest months, so shade and slower afternoons matter.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
August59mm average rain
August 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
August6.7 hours average sun
August is brighter than Isle of Portland's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
August17°C average sea
August is one of Isle of Portland's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to October
Sea temperatures are usually near 16°C in this stretch, so swimming comfort is at its strongest.
Weather score
August47 weather score
August is one of Isle of Portland's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.
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