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Guam September Weather

Averages and records for weather in Guam in the month of September.

Typical Guam September Weather 1991–2020
Average daily high	87.2 °F
Average daily low	76.3 °F
Average monthly precipitation	15.1 inches
Average monthly snow	none
Daily chance of precipitation	83.3%
Daily chance of snow	0%

Guam September Weather Records 1945–2024
Highest temperature	94 °F	September 6, 2016
Lowest temperature	70 °F	September 12, 1995
Highest daily low	82 °F	September 1, 2016
Lowest daily high	77 °F	September 4, 1953
Hottest average high temperature	90.3 °F	1983
Coldest average high temperature	83.5 °F	1975
Most daily precipitation	10.2 inches	September 19, 2013
Most monthly precipitation	32.2 inches	2013
Most daily snow	none	-
Most monthly snow	none	-

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

Day	Average (°F)		Record (°F)
Day	High	Low	High	Low
September 1	87.3	76.4	93	73
September 2	87.3	76.4	91	72
September 3	87.2	76.3	92	70
September 4	87.3	76.3	92	72
September 5	87.3	76.3	92	72
September 6	87.2	76.4	94	72
September 7	87.2	76.4	93	73
September 8	87.2	76.4	91	71
September 9	87.2	76.3	91	71
September 10	87.2	76.3	92	71
September 11	87.2	76.4	93	72
September 12	87.2	76.4	92	70
September 13	87.2	76.4	92	70
September 14	87.2	76.4	92	72
September 15	87.2	76.4	91	71
September 16	87.1	76.3	91	71
September 17	87.2	76.3	91	70
September 18	87.1	76.4	93	73
September 19	87.1	76.4	93	71
September 20	87.1	76.4	91	73
September 21	87.1	76.4	92	72
September 22	87.1	76.4	91	73
September 23	87.1	76.4	92	70
September 24	87.1	76.4	91	71
September 25	87.2	76.4	91	71
September 26	87.1	76.4	91	73
September 27	87.1	76.4	91	73
September 28	87.1	76.4	92	71
September 29	87.1	76.4	91	71
September 30	87.2	76.5	93	72

Weather Station Details

Years	Station	Coordinates
1945–2024	Guam International Airport	location