San Juan Weather in January
Average highs run from 29°C on January 1 to 29°C on January 31, and lows from 23°C to 23°C. Normal precipitation for the month is 267 mm over about 22 wet days.
January day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
January at a glance
- Average high
- 29°C
- Average low
- 23°C
- Precipitation
- 267 mm
- Reanalysis high
- 36°CJan 31, 1992
- Reanalysis low
- 20°CJan 28, 1992
- Daylight
- 12 h 20 min to 12 h 17 min
- Cloud cover
- 82%
- Humidity
- 90%
- Dew point
- 24°C
- Wind
- 2.5 km/h
Every day of the month
A wet day has at least 1 mm of precipitation in the reanalysis.
| Date | Normal high | Normal low | Reanalysis high | Reanalysis low | Chance wet |
|---|---|---|---|---|---|
| Jan 1 | 29°C | 23°C | 31°C 1992 | 22°C 2005 | 70% |
| Jan 2 | 29°C | 23°C | 31°C 1992 | 22°C 1993 | 71% |
| Jan 3 | 29°C | 23°C | 32°C 1994 | 22°C 2008 | 69% |
| Jan 4 | 29°C | 23°C | 31°C 2016 | 22°C 2000 | 68% |
| Jan 5 | 29°C | 23°C | 30°C 2011 | 22°C 1995 | 69% |
| Jan 6 | 29°C | 23°C | 31°C 1994 | 22°C 1993 | 69% |
| Jan 7 | 29°C | 23°C | 31°C 1992 | 21°C 1993 | 69% |
| Jan 8 | 29°C | 23°C | 33°C 1994 | 21°C 2000 | 69% |
| Jan 9 | 29°C | 23°C | 33°C 1994 | 21°C 1995 | 69% |
| Jan 10 | 29°C | 23°C | 31°C 1993 | 22°C 1995 | 69% |
| Jan 11 | 29°C | 23°C | 31°C 1992 | 22°C 1995 | 68% |
| Jan 12 | 29°C | 23°C | 31°C 1993 | 22°C 2001 | 69% |
| Jan 13 | 29°C | 23°C | 30°C 1991 | 21°C 2001 | 68% |
| Jan 14 | 29°C | 23°C | 31°C 2013 | 22°C 2009 | 68% |
| Jan 15 | 29°C | 23°C | 31°C 1992 | 21°C 1993 | 67% |
| Jan 16 | 29°C | 23°C | 31°C 1992 | 21°C 1999 | 67% |
| Jan 17 | 29°C | 23°C | 32°C 1992 | 21°C 2000 | 67% |
| Jan 18 | 29°C | 23°C | 32°C 1992 | 21°C 2001 | 68% |
| Jan 19 | 29°C | 23°C | 31°C 1992 | 22°C 1991 | 67% |
| Jan 20 | 29°C | 23°C | 31°C 2013 | 21°C 2001 | 66% |
| Jan 21 | 29°C | 23°C | 31°C 1992 | 21°C 1996 | 67% |
| Jan 22 | 29°C | 23°C | 32°C 1992 | 21°C 2001 | 68% |
| Jan 23 | 29°C | 23°C | 32°C 1992 | 21°C 2011 | 67% |
| Jan 24 | 29°C | 23°C | 34°C 1992 | 22°C 2002 | 67% |
| Jan 25 | 29°C | 23°C | 34°C 1992 | 21°C 1995 | 67% |
| Jan 26 | 29°C | 23°C | 34°C 1992 | 22°C 2001 | 68% |
| Jan 27 | 29°C | 23°C | 34°C 1992 | 22°C 1999 | 67% |
| Jan 28 | 29°C | 23°C | 35°C 1992 | 20°C 1992 | 67% |
| Jan 29 | 29°C | 23°C | 36°C 1992 | 21°C 2001 | 66% |
| Jan 30 | 29°C | 23°C | 36°C 1992 | 22°C 2011 | 67% |
| Jan 31 | 29°C | 23°C | 36°C 1992 | 21°C 2001 | 66% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-5).
- January 1
- sunrise 5:47 AM, sunset 6:07 PM
- January 31
- sunrise 5:58 AM, sunset 6:15 PM
Other months
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.