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San Juan December Weather

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

Typical San Juan December Weather 1991–2020
Average daily high	84.3 °F
Average daily low	73.3 °F
Average monthly precipitation	4.8 inches
Average monthly snow	none
Daily chance of precipitation	65.1%
Daily chance of snow	0%

San Juan December Weather Records 1956–2024
Highest temperature	94 °F	December 6, 1989
Lowest temperature	63 °F	December 22, 1964
Highest daily low	79 °F	December 9, 2023
Lowest daily high	76 °F	December 29, 2010
Hottest average high temperature	87.1 °F	1989
Coldest average high temperature	81.3 °F	1999
Most daily precipitation	7.0 inches	December 12, 1981
Most monthly precipitation	16.8 inches	1981
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
December 1	85.1	74.1	89	67
December 2	85.0	74.0	91	66
December 3	85.0	73.9	93	68
December 4	84.9	73.9	91	68
December 5	84.8	73.8	91	67
December 6	84.8	73.8	94	66
December 7	84.7	73.7	90	67
December 8	84.7	73.6	90	67
December 9	84.6	73.6	91	67
December 10	84.6	73.5	91	65
December 11	84.5	73.5	89	65
December 12	84.5	73.5	91	65
December 13	84.5	73.4	89	66
December 14	84.4	73.4	90	66
December 15	84.4	73.4	90	69
December 16	84.3	73.4	90	66
December 17	84.3	73.3	90	67
December 18	84.3	73.3	89	65
December 19	84.2	73.2	89	68
December 20	84.2	73.2	90	66
December 21	84.2	73.2	90	64
December 22	84.1	73.1	90	63
December 23	84.1	73.0	90	67
December 24	84.0	73.0	91	64
December 25	84.0	72.9	90	64
December 26	83.9	72.9	91	64
December 27	83.9	72.8	90	66
December 28	83.8	72.8	90	66
December 29	83.8	72.7	88	64
December 30	83.7	72.6	89	64
December 31	83.7	72.6	87	68

Weather Station Details

Years	Station	Coordinates
1956–2024	San Juan Airport	location