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San Juan weather in December

Weather in San Juan: December

Average day temperature: 82.0°F
Average night temperature: 75.4°F
Sea water temperature: 82.1°F
Number of sunny days: 5 days
Day length: 11.0 - 11.1 hours
Number of rainy days: 3 days
Precipitation totals: 1.7 in.
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Air temperature in December, °F

Show year:
2024
2023
2022
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
0
15
30
45
60
75
90
105
Day temperature   
Night temperature

The highest day temperature during December of 2024 was 87°F. At the same time the lowest night temperature was 74°F. Daily and nightly averages during December were 82.5°F and 78.1°F.

Sea water temperature in San Juan in December, °F

Show year:
2024
2023
2022
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
76
78
80
82
84
86
88
90

The average sea water temperature in December of 2024 was 83.7°F. The highest and lowest sea temperatures during the month were 84.7°F and 82.4°F.

Sunny, partly cloudy and cloudy days
Sunny days
Partly cloudy days
Cloudy days
13%
52%
35%

Mostly all days in December are partly cloudy but sunny or cloudy days are also possible.

Precipitation total in December, in.

jan
feb
mar
apr
may
jun
jul
aug
sep
oct
nov
dec
0.0
0.7
1.3
2.0
2.6
3.3
3.9
4.6
5.2
2.9
2.8
3.8
2.8
2.8
1.8
1.9
1.8
1.8
2.0
1.5
1.6
2.9
2.8
3.8
2.8
2.8
1.8
1.9
1.8
1.8
2.0
1.5

Precipitation total value in San Juan in December is 1.6 in. Other months of the year show relatively similar values.

Wind speed in December, mph
jan
feb
mar
apr
may
jun
jul
aug
sep
oct
nov
dec
0.0
2.1
4.2
6.4
8.5
10.6
12.7
14.9
9.2
8.3
9.6
11.2
12.4
11.6
10.9
10.5
11.3
12.0
11.0
11.0
9.2
8.3
9.6
11.2
12.4
11.6
10.9
10.5
11.3
12.0
11.0

The average wind speed value in December is 11.0 mph

Average sunny hours
jan
feb
mar
apr
may
jun
jul
aug
sep
oct
nov
dec
0.0
1.2
2.4
3.6
4.8
6.0
7.2
8.3
6.2
6.2
6.4
6.2
5.7
7.0
6.7
6.3
6.4
5.6
5.8
5.6
6.2
6.2
6.4
6.2
5.7
7.0
6.7
6.3
6.4
5.6
5.8

This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in December is: 5.6.

Best time for vacation in San Juan

Sunniest months:
June 10 days
March 10 days
April 9 days
Warmest months:
September 87.1 °F
August 87.0 °F
July 86.7 °F
Warmest sea temp:
October 84.9 °F
September 84.8 °F
August 83.9 °F
Coldest months:
February 80.6 °F
January 80.8 °F
March 81.3 °F
Rainiest months:
October 5 days
August 4 days
September 4 days
Windiest months:
July 12.6 mph
February 12.0 mph
August 11.9 mph

San Juan on a weather map

Leaflet | Tiles © Esri
Places in Puerto Rico:
Name
°F
Aguadilla
+81°F
Arecibo
+79°F
Isabella
+81°F
Mayaguez
+81°F
Ponce
+81°F
San Juan
+81°F
24 Hours Forecast
San Juan
Local time: 08:00
April 17, thursday
0900
81°F
NW
9 mph
1200
84°F
W
12 mph
1500
84°F
W
11 mph
1800
82°F
W
7 mph
2100
81°F
NW
6 mph
April 18, friday
0000
79°F
N
3 mph
0300
77°F
N
2 mph
0600
75°F
NW
2 mph
Units of measurement: °C / °F