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Belfast September Weather

Averages and records for weather in Belfast, United Kingdom in the month of September.

Typical Belfast September Weather 1991–2020
Average daily high	16.9 °C
Average daily low	10.0 °C
Average monthly precipitation	7.5 cm
Daily chance of precipitation	54.6%

Belfast September Weather Records 1959–2024
Highest temperature	25.8 °C	September 7, 2023
Lowest temperature	1.1 °C	September 28, 1974
Highest daily low	16.5 °C	September 9, 2023
Lowest daily high	9.0 °C	September 26, 1975
Hottest average high temperature	18.4 °C	2023
Coldest average high temperature	14.2 °C	1974
Most daily precipitation	8.0 cm	September 24, 2012
Most monthly precipitation	17.5 cm	1999

Note: Daily averages are a moving average which includes 14 days before and after

Day	Average (°C)		Record (°C)
Day	High	Low	High	Low
September 1	18.0	10.8	23.4	6.0
September 2	18.0	10.8	22.0	5.6
September 3	17.9	10.7	24.1	5.6
September 4	17.8	10.6	24.2	6.1
September 5	17.7	10.5	25.3	6.2
September 6	17.7	10.5	23.4	4.7
September 7	17.6	10.4	25.8	3.9
September 8	17.5	10.4	25.4	2.7
September 9	17.4	10.3	21.7	3.8
September 10	17.4	10.2	20.6	2.4
September 11	17.3	10.2	21.2	3.0
September 12	17.2	10.1	22.0	5.5
September 13	17.1	10.1	22.2	4.6
September 14	17.1	10.0	23.5	3.6
September 15	17.0	10.0	21.7	4.1
September 16	16.8	10.0	22.0	2.9
September 17	16.7	9.9	21.5	2.5
September 18	16.6	9.8	22.2	4.4
September 19	16.5	9.7	20.2	4.1
September 20	16.4	9.6	20.8	4.0
September 21	16.3	9.5	20.2	2.8
September 22	16.2	9.4	19.6	2.2
September 23	16.1	9.3	20.0	4.5
September 24	16.0	9.2	21.1	4.9
September 25	15.9	9.2	19.9	4.6
September 26	15.8	9.1	20.3	3.3
September 27	15.7	9.1	21.2	3.9
September 28	15.6	9.0	20.6	1.1
September 29	15.5	8.9	20.0	2.0
September 30	15.4	8.9	18.8	3.1

Weather Station Details

Years	Station	Coordinates
1959–2024	Stormont Castle	location