Cool
Average highs are around 19°C, so pack for cooler days.
September verdict
Portsmouth, England, United Kingdom in September
Weather score39Poor
Poor for holiday weather
Average highs are around 19°C, so pack for cooler days. Sunshine averages 5h per day, enough for a balanced month. Rainfall averages 70mm, which is relatively low for holiday planning.
September weather
Monthly averages
Temp
19°C
Rain
70mm
Sun
5h
Sea
17°C
Weather score
39
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 70mm, which is relatively low for holiday planning.
Some sun
Sunshine averages 5h 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
September19°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
September70mm average rain
September sits near Portsmouth's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsFebruary to September
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September5 hours average sun
September sits close to Portsmouth's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September17°C average sea
September is one of Portsmouth's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to October
Sea temperatures are usually near 17°C in this stretch, so swimming comfort is at its strongest.
Weather score
September39 weather score
September sits close to Portsmouth'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.
