Cool
Average highs are around 18°C, so pack for cooler days.
Weather Guide
Belfast, Northern Ireland, United Kingdom Average Monthly Weather
Weather score22Poor annual avg
Best months: July, June, August
Across the year, average daytime temperatures are around 12°C, sunshine averages 3.6h per day, and rainfall totals about 981mm. Sea temperatures average 11°C across the year.
Annual weather
Annual averages
Temp
12°C
Rain
981mm
Annual total
Sun
3.6h
Sea
11°C
Weather score
22
Poor avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 63mm, which is relatively low for holiday planning.
Limited sun
Sunshine averages 4.9h per day, so this is not one of the brighter months.
Cool sea
Sea temperatures average 13°C, so the water can feel cool.
Map
Weather map
Compare Belfast, Northern Ireland, United Kingdom with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
July18°C average high
July is one of Belfast's hottest months, so shade and slower afternoons matter.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
July63mm average rain
July is one of Belfast's driest months, making outdoor days easier to plan than in wetter parts of the year.
Driest monthsFebruary to August
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
July4.9 hours average sun
July is brighter than Belfast's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsApril to July
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
July13°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 13°C in this stretch, so swimming comfort is at its strongest.
Weather score
July35 weather score
July is one of Belfast'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.
