San Juan Weather in August
Average highs run from 29°C on August 1 to 30°C on August 31, and lows from 22°C to 22°C. Normal precipitation for the month is 143 mm over about 16 wet days.
August day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
August at a glance
- Average high
- 29°C
- Average low
- 22°C
- Precipitation
- 143 mm
- Reanalysis high
- 36°CAug 28, 1992
- Reanalysis low
- 15°CAug 17, 1999
- Daylight
- 11 h 57 min to 12 h 02 min
- Cloud cover
- 66%
- Humidity
- 87%
- Dew point
- 23°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 |
|---|---|---|---|---|---|
| Aug 1 | 29°C | 22°C | 34°C 1992 | 19°C 1993 | 40% |
| Aug 2 | 29°C | 22°C | 32°C 1992 | 17°C 1993 | 42% |
| Aug 3 | 29°C | 22°C | 33°C 1992 | 19°C 1993 | 42% |
| Aug 4 | 29°C | 22°C | 32°C 1992 | 19°C 1991 | 42% |
| Aug 5 | 29°C | 22°C | 34°C 1992 | 18°C 1991 | 41% |
| Aug 6 | 29°C | 22°C | 34°C 1992 | 18°C 2019 | 41% |
| Aug 7 | 29°C | 22°C | 33°C 2011 | 18°C 2019 | 41% |
| Aug 8 | 29°C | 22°C | 34°C 2011 | 20°C 2010 | 42% |
| Aug 9 | 29°C | 22°C | 34°C 2011 | 21°C 2010 | 44% |
| Aug 10 | 29°C | 22°C | 34°C 2011 | 19°C 1997 | 46% |
| Aug 11 | 29°C | 22°C | 35°C 2011 | 19°C 1997 | 48% |
| Aug 12 | 29°C | 22°C | 35°C 2011 | 21°C 2009 | 48% |
| Aug 13 | 29°C | 22°C | 33°C 2011 | 19°C 1994 | 49% |
| Aug 14 | 29°C | 22°C | 32°C 1993 | 20°C 1994 | 50% |
| Aug 15 | 29°C | 22°C | 33°C 1993 | 20°C 1999 | 49% |
| Aug 16 | 29°C | 22°C | 33°C 2011 | 18°C 1999 | 48% |
| Aug 17 | 29°C | 22°C | 33°C 2011 | 15°C 1999 | 47% |
| Aug 18 | 29°C | 22°C | 34°C 2011 | 18°C 1999 | 48% |
| Aug 19 | 29°C | 22°C | 36°C 2011 | 18°C 1999 | 49% |
| Aug 20 | 29°C | 22°C | 33°C 2011 | 19°C 1999 | 50% |
| Aug 21 | 29°C | 22°C | 32°C 1992 | 18°C 1999 | 51% |
| Aug 22 | 29°C | 22°C | 31°C 1992 | 19°C 2020 | 50% |
| Aug 23 | 29°C | 22°C | 33°C 1992 | 19°C 2020 | 49% |
| Aug 24 | 29°C | 22°C | 35°C 2011 | 20°C 2020 | 48% |
| Aug 25 | 29°C | 22°C | 34°C 1992 | 21°C 2020 | 46% |
| Aug 26 | 29°C | 22°C | 34°C 1992 | 21°C 1994 | 46% |
| Aug 27 | 29°C | 22°C | 35°C 1992 | 21°C 2013 | 46% |
| Aug 28 | 29°C | 22°C | 36°C 1992 | 20°C 2013 | 46% |
| Aug 29 | 29°C | 22°C | 35°C 1992 | 18°C 2013 | 46% |
| Aug 30 | 29°C | 22°C | 35°C 1992 | 19°C 2003 | 45% |
| Aug 31 | 30°C | 22°C | 35°C 1992 | 20°C 2013 | 46% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-5).
- August 1
- sunrise 6:01 AM, sunset 5:58 PM
- August 31
- sunrise 5:52 AM, sunset 5:54 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.