San Juan Weather in August
Average highs run from 27°C on August 1 to 27°C on August 31, and lows from 21°C to 21°C. Normal precipitation for the month is 181 mm over about 23 wet days.
August day by day
The normal high and low for each date, and the record, in °C.
- Normal low
- Normal high
- Record high
- Record low
August at a glance
- Average high
- 27°C
- Average low
- 21°C
- Precipitation
- 181 mm
- Record high
- 36°CAug 3, 1974
- Record low
- 12°CAug 4, 2018
- Daylight
- 12 h 33 min to 12 h 19 min
- Cloud cover
- 83%
- Humidity
- 87%
- Dew point
- 21°C
- Wind
- 4.0 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 | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Aug 1 | 27°C | 21°C | 32°C 2019 | 17°C 2008 | 67% |
| Aug 2 | 27°C | 21°C | 32°C 2019 | 16°C 1979 | 68% |
| Aug 3 | 27°C | 21°C | 36°C 1974 | 16°C 1984 | 68% |
| Aug 4 | 27°C | 21°C | 31°C 2020 | 12°C 2018 | 69% |
| Aug 5 | 27°C | 21°C | 31°C 2023 | 16°C 1980 | 69% |
| Aug 6 | 27°C | 21°C | 31°C 2014 | 17°C 1990 | 70% |
| Aug 7 | 27°C | 21°C | 31°C 2014 | 15°C 1980 | 70% |
| Aug 8 | 27°C | 21°C | 31°C 2004 | 15°C 1980 | 71% |
| Aug 9 | 27°C | 21°C | 32°C 2015 | 15°C 1977 | 72% |
| Aug 10 | 27°C | 21°C | 32°C 2023 | 15°C 1977 | 73% |
| Aug 11 | 27°C | 21°C | 32°C 2024 | 16°C 1985 | 74% |
| Aug 12 | 27°C | 21°C | 32°C 2002 | 16°C 1977 | 74% |
| Aug 13 | 27°C | 21°C | 31°C 2006 | 16°C 1977 | 75% |
| Aug 14 | 27°C | 21°C | 31°C 2009 | 12°C 1990 | 74% |
| Aug 15 | 27°C | 21°C | 32°C 1980 | 16°C 1977 | 75% |
| Aug 16 | 27°C | 21°C | 32°C 2002 | 12°C 1976 | 76% |
| Aug 17 | 27°C | 21°C | 32°C 2024 | 15°C 1976 | 76% |
| Aug 18 | 27°C | 21°C | 32°C 2024 | 17°C 1977 | 76% |
| Aug 19 | 27°C | 21°C | 32°C 2002 | 16°C 1984 | 77% |
| Aug 20 | 27°C | 21°C | 31°C 2018 | 12°C 1978 | 77% |
| Aug 21 | 27°C | 21°C | 31°C 2022 | 13°C 1977 | 76% |
| Aug 22 | 27°C | 21°C | 32°C 1997 | 15°C 1977 | 76% |
| Aug 23 | 27°C | 21°C | 33°C 1977 | 15°C 1977 | 75% |
| Aug 24 | 27°C | 21°C | 31°C 2019 | 12°C 1988 | 75% |
| Aug 25 | 27°C | 21°C | 32°C 2019 | 15°C 1977 | 75% |
| Aug 26 | 27°C | 21°C | 31°C 2015 | 16°C 1979 | 75% |
| Aug 27 | 27°C | 21°C | 31°C 2015 | 16°C 1985 | 76% |
| Aug 28 | 27°C | 21°C | 31°C 2019 | 16°C 1985 | 76% |
| Aug 29 | 27°C | 21°C | 31°C 2015 | 16°C 1977 | 77% |
| Aug 30 | 27°C | 21°C | 32°C 2024 | 16°C 1977 | 76% |
| Aug 31 | 27°C | 21°C | 32°C 2024 | 16°C 1977 | 76% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (CST).
- August 1
- sunrise 5:27 AM, sunset 6:00 PM
- August 31
- sunrise 5:28 AM, sunset 5:47 PM
Other months
Sources
Records: NOAA GHCN-Daily, station CSM00078762, every year on file, quality-flagged values removed. 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 2026-09-26. Sun and moon: computed with the NOAA solar equations and Meeus.