Osan Weather in May
Average highs run from 19°C on May 1 to 23°C on May 31, and lows from 8°C to 13°C. Normal precipitation for the month is 93 mm over about 6 wet days.
May day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
May at a glance
- Average high
- 21°C
- Average low
- 11°C
- Precipitation
- 93 mm
- Reanalysis high
- 29°CMay 31, 2014
- Reanalysis low
- 4°CMay 1, 2010
- Daylight
- 13 h 43 min to 14 h 31 min
- Cloud cover
- 60%
- Humidity
- 77%
- Dew point
- 11°C
- Wind
- 13.7 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 |
|---|---|---|---|---|---|
| May 1 | 19°C | 8°C | 25°C 2017 | 4°C 2010 | 25% |
| May 2 | 19°C | 8°C | 24°C 2012 | 5°C 2000 | 26% |
| May 3 | 19°C | 9°C | 26°C 2017 | 6°C 2013 | 26% |
| May 4 | 19°C | 9°C | 25°C 2017 | 5°C 1995 | 27% |
| May 5 | 19°C | 9°C | 24°C 2017 | 5°C 1991 | 28% |
| May 6 | 19°C | 9°C | 25°C 2009 | 6°C 2014 | 28% |
| May 7 | 20°C | 9°C | 23°C 2013 | 5°C 2005 | 26% |
| May 8 | 20°C | 10°C | 24°C 2001 | 7°C 2005 | 27% |
| May 9 | 20°C | 10°C | 26°C 2000 | 6°C 2005 | 28% |
| May 10 | 20°C | 10°C | 24°C 2014 | 6°C 1992 | 28% |
| May 11 | 20°C | 10°C | 24°C 2017 | 6°C 1995 | 28% |
| May 12 | 20°C | 10°C | 25°C 2019 | 7°C 1996 | 28% |
| May 13 | 20°C | 10°C | 24°C 2003 | 8°C 2010 | 28% |
| May 14 | 20°C | 10°C | 24°C 2020 | 7°C 2008 | 27% |
| May 15 | 21°C | 11°C | 25°C 2018 | 7°C 2008 | 26% |
| May 16 | 21°C | 11°C | 27°C 2019 | 8°C 2011 | 26% |
| May 17 | 21°C | 11°C | 26°C 2019 | 8°C 2011 | 26% |
| May 18 | 21°C | 11°C | 26°C 2016 | 8°C 1994 | 26% |
| May 19 | 21°C | 11°C | 28°C 2016 | 6°C 1994 | 26% |
| May 20 | 21°C | 11°C | 27°C 2016 | 7°C 1994 | 24% |
| May 21 | 22°C | 12°C | 27°C 1998 | 7°C 2013 | 23% |
| May 22 | 22°C | 12°C | 27°C 2016 | 9°C 1996 | 24% |
| May 23 | 22°C | 12°C | 26°C 2013 | 9°C 1993 | 23% |
| May 24 | 22°C | 12°C | 28°C 2019 | 8°C 1992 | 22% |
| May 25 | 22°C | 12°C | 28°C 2013 | 8°C 1992 | 21% |
| May 26 | 22°C | 12°C | 27°C 2019 | 9°C 1992 | 22% |
| May 27 | 23°C | 13°C | 27°C 2015 | 8°C 1992 | 22% |
| May 28 | 23°C | 13°C | 28°C 2015 | 9°C 1994 | 21% |
| May 29 | 23°C | 13°C | 27°C 2014 | 9°C 1999 | 21% |
| May 30 | 23°C | 13°C | 29°C 2014 | 10°C 1994 | 21% |
| May 31 | 23°C | 13°C | 29°C 2014 | 10°C 2008 | 21% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+9).
- May 1
- sunrise 5:38 AM, sunset 7:21 PM
- May 31
- sunrise 5:14 AM, sunset 7:45 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.