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Guernsey September Weather

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

Typical Guernsey September Weather 1991–2020
Average daily high	18.1 °C
Average daily low	13.2 °C
Average monthly precipitation	5.5 cm
Daily chance of precipitation	43.9%

Guernsey September Weather Records 1959–2024
Highest temperature	30.6 °C	September 1, 1961
Lowest temperature	5.8 °C	September 28, 1974
Highest daily low	19.3 °C	September 4, 2005
Lowest daily high	11.8 °C	September 16, 1986
Hottest average high temperature	21.4 °C	2023
Coldest average high temperature	15.5 °C	1986
Most daily precipitation	3.7 cm	September 23, 2012
Most monthly precipitation	15.9 cm	1976

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	19.0	13.9	30.6	8.9
September 2	19.0	13.8	23.6	9.9
September 3	18.9	13.8	25.3	10.2
September 4	18.8	13.7	27.1	10.3
September 5	18.8	13.7	28.3	9.7
September 6	18.7	13.6	27.5	8.7
September 7	18.6	13.6	26.9	9.2
September 8	18.6	13.5	29.5	9.8
September 9	18.5	13.5	25.2	10.4
September 10	18.5	13.4	24.8	9.2
September 11	18.4	13.4	25.8	8.0
September 12	18.4	13.3	24.4	10.0
September 13	18.3	13.3	28.1	9.6
September 14	18.2	13.3	25.1	8.9
September 15	18.2	13.3	26.4	9.5
September 16	18.1	13.2	26.9	9.2
September 17	18.0	13.2	24.1	8.9
September 18	17.9	13.2	25.2	8.9
September 19	17.8	13.1	24.7	8.8
September 20	17.7	13.0	24.0	8.9
September 21	17.6	12.9	23.4	8.9
September 22	17.5	12.9	23.3	8.0
September 23	17.4	12.8	23.5	7.4
September 24	17.3	12.7	20.7	9.8
September 25	17.2	12.6	21.5	8.4
September 26	17.2	12.6	23.2	7.9
September 27	17.1	12.6	24.2	8.9
September 28	17.0	12.5	24.5	5.8
September 29	16.9	12.5	23.4	7.6
September 30	16.8	12.4	23.6	6.7

Weather Station Details

Years	Station	Coordinates
1959–2024	Guernsey: Airport	location