This page is a single place to check Belfast climate: monthly averages. Belfast runs from 5.5 C in Feb to 14.5 C in Jul, a swing of 9.0 C. Rain is spread through the year, with Oct the wettest month at 3.74 mm/day and Apr the driest at 2.01 mm/day. Taken together that is roughly 1,066 mm of rain a year for the grid cell. The same build that regenerates the sitemap refreshes these values, and unchanged pages are left untouched. Scroll for the month-by-month figures, or jump to a neighbouring location from the links below.
Annual mean temperature 9.8 C
Warmest month Aug (14.5 C)
Coldest month Feb (5.5 C)
Wettest month Oct (3.74 mm/day)
All-time record high 23.3 C
All-time record low -1.6 C
Annual precipitation 1,066 mm / year
Coordinates 54.59682, -5.92541
Population 348,005
Average monthly temperature and rainfall in Belfast
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
5.8
3.17
12.8
-0.1
Feb
5.5
2.75
12.7
-1.6
Mar
6.2
2.45
14.3
-1.4
Apr
8.0
2.01
17.1
0.7
May
10.5
2.28
19.9
3.5
Jun
13.1
2.76
23.1
5.6
Jul
14.5
2.90
23.3
8.6
Aug
14.5
3.20
22.6
8.8
Sep
13.2
2.74
20.1
6.3
Oct
11.1
3.74
16.9
3.5
Nov
8.4
3.72
15.1
0.4
Dec
6.6
3.34
13.1
-0.6
What the Belfast climate table shows
Values are multi-decadal climatological averages for the 54.59682, -5.92541 grid cell, not a single year. Rain is the daily mean, so a value of 2.00 mm/day is about 60 mm across a 30-day month. Averages smooth over extremes, so use them for planning rather than for what to pack for next Tuesday.
Frequently asked questions
Does Belfast get the same every year?
Close to it. Averaging decades smooths variation, so treat these as typical rather than guaranteed.