Belfast climate

Name: Belfast
Address: GB

Belfast is warmest in July, with average highs of 18 °C, and coldest in February, when nights average 3.6 °C. October is the wettest month (88 mm) and March the driest (64 mm). Figures are 1991–2020 climate normals.

Across a full year Belfast averages 913 mm of rain, 0 days above 25 °C and 6 days below freezing.

United Kingdom · population 348,005 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month July 18 °C
Coldest month February 3.6 °C
Driest month March 64 mm
Wettest month October 88 mm
Least cloud May 68 % cloud
Hottest on record June 26 °C
Coldest on record December -6.8 °C

What to expectBelfast through the year

Belfast has a clear annual cycle: average daily highs run from 7.7 °C in February to 18 °C in July, a swing of 9.4 °C in mean temperature across the year.

Counted across a normal year, 0 days a year reach 25 °C, 6 nights drop below freezing. The warmest reading in the 1991–2020 record is 26 °C, in June.

Rain is spread fairly evenly through the year, from 64 mm in March to 88 mm in October. There is no dry season to aim for.

Month by month

Month	Avg high	Rainfall	Cloud
January	7.5 °C	78 mm	75 %
February	7.7 °C	64 mm	74 %
March	9.1 °C	64 mm	74 %
April	11.0 °C	65 mm	70 %
May	13.6 °C	71 mm	68 %
June	16.0 °C	77 mm	74 %
July	17.6 °C	84 mm	76 %
August	17.4 °C	82 mm	74 %
September	15.7 °C	71 mm	74 %
October	12.7 °C	88 mm	74 %
November	9.8 °C	88 mm	74 %
December	7.9 °C	82 mm	74 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days below 0 °C
January	7.5 °C	3.8 °C	5.6 °C	14.2 °C	-4.6 °C	2
February	7.7 °C	3.6 °C	5.7 °C	14.3 °C	-3.2 °C	2
March	9.1 °C	4.3 °C	6.7 °C	15.9 °C	-4.5 °C	1
April	11.0 °C	5.7 °C	8.4 °C	18.4 °C	-1.4 °C	0
May	13.6 °C	8.1 °C	10.9 °C	22.6 °C	0.9 °C	0
June	16.0 °C	10.7 °C	13.4 °C	26.4 °C	4.8 °C	0
July	17.6 °C	12.4 °C	15.0 °C	24.5 °C	7.6 °C	0
August	17.4 °C	12.5 °C	14.9 °C	24.1 °C	6.4 °C	0
September	15.7 °C	11.1 °C	13.4 °C	22.3 °C	3.6 °C	0
October	12.7 °C	8.8 °C	10.8 °C	19.2 °C	0.7 °C	0
November	9.8 °C	6.2 °C	8.0 °C	16.2 °C	-1.6 °C	0
December	7.9 °C	4.3 °C	6.1 °C	14.6 °C	-6.8 °C	2

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	78 mm	14	7.9 h/day	75 %	84 %	25 km/h
February	64 mm	12	9.7 h/day	74 %	82 %	25 km/h
March	64 mm	13	12 h/day	74 %	81 %	24 km/h
April	65 mm	13	14 h/day	70 %	79 %	22 km/h
May	71 mm	14	16 h/day	68 %	78 %	20 km/h
June	77 mm	13	17 h/day	74 %	79 %	19 km/h
July	84 mm	15	17 h/day	76 %	81 %	18 km/h
August	82 mm	14	15 h/day	74 %	82 %	19 km/h
September	71 mm	13	13 h/day	74 %	82 %	21 km/h
October	88 mm	13	11 h/day	74 %	83 %	23 km/h
November	88 mm	14	8.5 h/day	74 %	85 %	24 km/h
December	82 mm	13	7.3 h/day	74 %	85 %	24 km/h

How Belfast compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Belfast	18 °C	3.6 °C	913 mm	0
Douglas · Isle of Man	16 °C	5.1 °C	1,033 mm	0
Dublin · Ireland	18 °C	3.8 °C	860 mm	0
Glasgow · United Kingdom	18 °C	1.3 °C	1,164 mm	1

Where Belfast ranks

Ranking	Position	Value
The coolest places in Europe in July	11th of 50	18 °C
The coolest places in Europe in August	15th of 50	17 °C
The coolest places in Europe in June	16th of 50	16 °C
The coolest places in Europe in May	27th of 50	14 °C
The coolest places in the world in May	39th of 50	14 °C

Planning a trip? See the best time to visit Belfast.

QuestionsCommon questions about Belfast’s climate

When is the best time to visit Belfast?

That depends on what you want, so the honest answer is a comparison rather than a single month. June, July, August sit closest to 20 °C on average, July is the warmest month and March the driest. The month-by-month table above has the full picture.

How hot does Belfast get?

In July, the warmest month, daily highs average 18 °C. The highest value in the 1991–2020 record is 26 °C.

How cold does it get in winter?

Nights average 3.6 °C in February, the coldest month. A normal year has 6 nights below freezing.

Which month is wettest in Belfast?

October, averaging 88 mm over 13 days with rain. The driest month is March with 64 mm. The year as a whole averages 913 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Belfast rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Data point: 54.597°, -5.925° (the coordinates the reanalysis values are taken for)
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.