Chilaw Weather in September
Average highs run from 29°C on September 1 to 29°C on September 30, and lows from 25°C to 25°C. Normal precipitation for the month is 110 mm over about 19 wet days.
September day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
September at a glance
- Average high
- 29°C
- Average low
- 25°C
- Precipitation
- 110 mm
- Reanalysis high
- 32°CSep 28, 1995
- Reanalysis low
- 24°CSep 8, 2015
- Daylight
- 12 h 16 min to 12 h 04 min
- Cloud cover
- 75%
- Humidity
- 82%
- Dew point
- 23°C
- Wind
- 22.0 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 | Reanalysis high | Reanalysis low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 29°C | 25°C | 31°C 2002 | 24°C 2010 | 57% |
| Sep 2 | 29°C | 25°C | 32°C 2017 | 24°C 1992 | 57% |
| Sep 3 | 29°C | 25°C | 31°C 1997 | 24°C 2011 | 58% |
| Sep 4 | 29°C | 25°C | 31°C 2002 | 24°C 2001 | 60% |
| Sep 5 | 29°C | 25°C | 31°C 2001 | 24°C 1992 | 60% |
| Sep 6 | 29°C | 25°C | 32°C 2001 | 24°C 1992 | 60% |
| Sep 7 | 29°C | 25°C | 31°C 1997 | 24°C 2015 | 61% |
| Sep 8 | 29°C | 25°C | 31°C 2002 | 24°C 2015 | 62% |
| Sep 9 | 29°C | 25°C | 31°C 2019 | 24°C 2008 | 62% |
| Sep 10 | 29°C | 25°C | 31°C 2001 | 24°C 2007 | 63% |
| Sep 11 | 29°C | 25°C | 32°C 2002 | 25°C 2007 | 63% |
| Sep 12 | 29°C | 25°C | 32°C 2018 | 24°C 2018 | 64% |
| Sep 13 | 29°C | 25°C | 32°C 2002 | 25°C 1994 | 65% |
| Sep 14 | 29°C | 25°C | 32°C 2002 | 25°C 1997 | 66% |
| Sep 15 | 29°C | 25°C | 32°C 1995 | 25°C 1997 | 66% |
| Sep 16 | 29°C | 25°C | 31°C 2003 | 25°C 1998 | 67% |
| Sep 17 | 29°C | 25°C | 31°C 2003 | 25°C 1997 | 67% |
| Sep 18 | 29°C | 25°C | 31°C 2002 | 25°C 1997 | 67% |
| Sep 19 | 29°C | 25°C | 31°C 2002 | 24°C 1997 | 66% |
| Sep 20 | 29°C | 25°C | 32°C 1994 | 24°C 1994 | 67% |
| Sep 21 | 29°C | 25°C | 31°C 1994 | 24°C 1992 | 68% |
| Sep 22 | 29°C | 25°C | 31°C 2014 | 24°C 2010 | 67% |
| Sep 23 | 29°C | 25°C | 32°C 1995 | 25°C 2013 | 67% |
| Sep 24 | 29°C | 25°C | 32°C 1995 | 24°C 1998 | 68% |
| Sep 25 | 29°C | 25°C | 32°C 2003 | 24°C 1998 | 66% |
| Sep 26 | 29°C | 25°C | 32°C 2003 | 24°C 1992 | 67% |
| Sep 27 | 29°C | 25°C | 32°C 2002 | 24°C 2004 | 68% |
| Sep 28 | 29°C | 25°C | 32°C 1995 | 24°C 2004 | 68% |
| Sep 29 | 29°C | 25°C | 32°C 2005 | 24°C 1994 | 68% |
| Sep 30 | 29°C | 25°C | 31°C 2008 | 24°C 2010 | 69% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+5:30).
- September 1
- sunrise 6:03 AM, sunset 6:19 PM
- September 30
- sunrise 5:59 AM, sunset 6:03 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.