San Juan weather in January

Weather in San Juan: January


	Average day temperature:	80.8°F
	Average night temperature:	74.1°F

	Sea water temperature:	80.5°F

	Number of sunny days:	8 days
	Day length:	11.0 - 11.3 hours

	Number of rainy days:	3 days
	Precipitation totals:	42.5 in.

more information

14 days
forecast

San Juan

sea water
temperature

San Juan

January
February
March
April

May
June
July
August

September
October
November
December

Show year:

2025

2024

2023

112

Day temperature

Night temperature

The highest day temperature during January of 2025 was 85°F. At the same time the lowest night temperature was 70°F. Daily and nightly averages during January were 80.8°F and 76.4°F.

Show year:

2025

2024

2023

The average sea water temperature in January of 2025 was 81.5°F. The highest and lowest sea temperatures during the month were 82.4°F and 80.8°F.

	Sunny days
	Partly cloudy days
	Cloudy days

23%

48%

29%

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

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

1.6

2.9

2.8

3.8

2.8

1.8

1.9

1.8

2.0

1.6

2.9

2.8

3.8

2.8

1.8

1.9

1.8

2.0

1.5

Precipitation total value in San Juan in January is 1.5 in. Other months of the year show relatively similar values.

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

11.0

9.2

8.3

9.6

11.2

12.4

11.6

10.9

10.5

11.3

12.0

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 January is 11.0 mph

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

5.6

6.2

6.4

6.2

5.7

7.0

6.7

6.3

6.4

5.6

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 January is: 5.8.