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San Juan September Weather

Averages and records for weather in San Juan, Puerto Rico in the month of September.

Typical San Juan September Weather 1991–2020
Average daily high	89.3 °F
Average daily low	77.5 °F
Average monthly precipitation	6.5 inches
Average monthly snow	none
Daily chance of precipitation	61.0%
Daily chance of snow	0%

San Juan September Weather Records 1956–2024
Highest temperature	97 °F	September 1, 1981
Lowest temperature	69 °F	September 15, 1960
Highest daily low	83 °F	September 14, 2023
Lowest daily high	77 °F	September 13, 1985
Hottest average high temperature	91.6 °F	2023
Coldest average high temperature	86.5 °F	1966
Most daily precipitation	8.8 inches	September 18, 1989
Most monthly precipitation	15.8 inches	2017
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	89.2	77.7	97	71
September 2	89.2	77.6	95	72
September 3	89.2	77.6	93	71
September 4	89.2	77.6	95	70
September 5	89.2	77.6	96	71
September 6	89.3	77.6	94	69
September 7	89.3	77.6	95	72
September 8	89.3	77.6	95	71
September 9	89.3	77.6	94	70
September 10	89.3	77.6	94	71
September 11	89.3	77.6	94	72
September 12	89.3	77.6	94	72
September 13	89.3	77.6	96	71
September 14	89.3	77.5	95	71
September 15	89.3	77.5	94	69
September 16	89.3	77.5	92	72
September 17	89.3	77.5	95	73
September 18	89.3	77.5	96	71
September 19	89.3	77.4	95	72
September 20	89.3	77.4	95	73
September 21	89.3	77.4	95	71
September 22	89.3	77.4	96	72
September 23	89.2	77.4	95	71
September 24	89.2	77.4	94	70
September 25	89.2	77.3	96	70
September 26	89.1	77.3	96	71
September 27	89.1	77.2	94	72
September 28	89.1	77.2	95	72
September 29	89.1	77.2	96	71
September 30	89.1	77.1	94	73

Weather Station Details

Years	Station	Coordinates
1956–2024	San Juan Airport	location