Chilaw Weather in May
Average highs run from 31°C on May 1 to 29°C on May 31, and lows from 26°C to 26°C. Normal precipitation for the month is 154 mm over about 22 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
- 30°C
- Average low
- 26°C
- Precipitation
- 154 mm
- Reanalysis high
- 36°CMay 7, 1998
- Reanalysis low
- 24°CMay 1, 2010
- Daylight
- 12 h 24 min to 12 h 31 min
- Cloud cover
- 73%
- Humidity
- 83%
- Dew point
- 25°C
- Wind
- 20.5 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 |
|---|---|---|---|---|---|
| May 1 | 31°C | 26°C | 33°C 1998 | 24°C 2010 | 75% |
| May 2 | 31°C | 26°C | 33°C 1998 | 25°C 1999 | 75% |
| May 3 | 31°C | 26°C | 33°C 1998 | 25°C 2012 | 75% |
| May 4 | 31°C | 26°C | 33°C 2017 | 25°C 2012 | 73% |
| May 5 | 31°C | 26°C | 34°C 1998 | 26°C 2012 | 73% |
| May 6 | 30°C | 26°C | 35°C 1998 | 25°C 2018 | 73% |
| May 7 | 30°C | 26°C | 36°C 1998 | 25°C 1994 | 73% |
| May 8 | 30°C | 26°C | 33°C 2000 | 25°C 1994 | 72% |
| May 9 | 30°C | 26°C | 33°C 2000 | 25°C 1999 | 71% |
| May 10 | 30°C | 26°C | 33°C 1993 | 25°C 2012 | 72% |
| May 11 | 30°C | 26°C | 33°C 2019 | 25°C 2012 | 71% |
| May 12 | 30°C | 26°C | 33°C 1996 | 25°C 2015 | 71% |
| May 13 | 30°C | 26°C | 32°C 1996 | 25°C 2015 | 70% |
| May 14 | 30°C | 26°C | 32°C 1996 | 25°C 2011 | 70% |
| May 15 | 30°C | 26°C | 33°C 2019 | 25°C 1997 | 69% |
| May 16 | 30°C | 26°C | 33°C 1996 | 25°C 1999 | 69% |
| May 17 | 30°C | 26°C | 33°C 1996 | 25°C 1999 | 69% |
| May 18 | 30°C | 26°C | 33°C 1996 | 25°C 2018 | 68% |
| May 19 | 30°C | 26°C | 32°C 2019 | 25°C 2018 | 70% |
| May 20 | 30°C | 26°C | 33°C 1996 | 25°C 1993 | 69% |
| May 21 | 30°C | 26°C | 34°C 1996 | 25°C 2010 | 69% |
| May 22 | 30°C | 26°C | 34°C 1996 | 25°C 1995 | 69% |
| May 23 | 30°C | 26°C | 33°C 2000 | 25°C 1995 | 71% |
| May 24 | 30°C | 26°C | 32°C 1996 | 25°C 1995 | 71% |
| May 25 | 30°C | 26°C | 31°C 1998 | 25°C 2008 | 71% |
| May 26 | 30°C | 26°C | 32°C 1996 | 25°C 1999 | 71% |
| May 27 | 30°C | 26°C | 32°C 2019 | 25°C 1999 | 71% |
| May 28 | 30°C | 26°C | 32°C 2019 | 25°C 1999 | 72% |
| May 29 | 30°C | 26°C | 32°C 2019 | 25°C 1999 | 73% |
| May 30 | 30°C | 26°C | 31°C 2019 | 25°C 1999 | 74% |
| May 31 | 29°C | 26°C | 31°C 1997 | 25°C 2006 | 77% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+5:30).
- May 1
- sunrise 5:56 AM, sunset 6:20 PM
- May 31
- sunrise 5:53 AM, sunset 6:24 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 2026-09-26. Sun and moon: computed with the NOAA solar equations and Meeus.