Mild
Average highs are around 21°C, so days are mild rather than hot.
Weather Guide
Portsmouth, England, United Kingdom Average Monthly Weather
Weather score30Poor annual avg
Best months: July, August, June
Across the year, average daytime temperatures are around 14°C, sunshine averages 4.4h per day, and rainfall totals about 788mm. Sea temperatures average 13°C across the year.
Annual weather
Annual averages
Temp
14°C
Rain
788mm
Annual total
Sun
4.4h
Sea
13°C
Weather score
30
Poor avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 44mm, 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 Portsmouth, England, United Kingdom with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
July21°C average high
July is one of Portsmouth's warmest months, with daytime heat above the yearly average.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
July44mm average rain
July is one of Portsmouth's driest months, making outdoor days easier to plan than in wetter parts of the year.
Driest monthsFebruary to September
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
July6.7 hours average sun
July is one of Portsmouth'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
July17°C average sea
July sits in the warmer sea-temperature season, usually making swimming easier to enjoy.
Warmest seaJuly to October
Sea temperatures are usually near 17°C in this stretch, so swimming comfort is at its strongest.
Weather score
July50 weather score
July is one of Portsmouth'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.
