Colombo Weather in September
Average highs run from 23°C on September 1 to 23°C on September 30, and lows from 13°C to 15°C. Normal precipitation for the month is 144 mm over about 15 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
- 23°C
- Average low
- 14°C
- Precipitation
- 144 mm
- Reanalysis high
- 35°CSep 27, 2020
- Reanalysis low
- 3°CSep 5, 2006
- Daylight
- 11 h 36 min to 12 h 18 min
- Cloud cover
- 76%
- Humidity
- 87%
- Dew point
- 15°C
- Wind
- 4.3 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 | 23°C | 13°C | 30°C 2009 | 8°C 2011 | 38% |
| Sep 2 | 23°C | 13°C | 28°C 1999 | 3°C 2002 | 39% |
| Sep 3 | 23°C | 13°C | 29°C 1997 | 4°C 2002 | 40% |
| Sep 4 | 23°C | 13°C | 28°C 1997 | 7°C 2006 | 41% |
| Sep 5 | 23°C | 14°C | 28°C 2017 | 3°C 2006 | 42% |
| Sep 6 | 23°C | 14°C | 29°C 2020 | 5°C 2006 | 43% |
| Sep 7 | 23°C | 14°C | 30°C 1999 | 7°C 2006 | 45% |
| Sep 8 | 23°C | 14°C | 33°C 2012 | 9°C 2016 | 45% |
| Sep 9 | 23°C | 14°C | 32°C 1997 | 9°C 1994 | 45% |
| Sep 10 | 23°C | 14°C | 32°C 2019 | 9°C 1996 | 45% |
| Sep 11 | 23°C | 14°C | 32°C 2006 | 7°C 1996 | 46% |
| Sep 12 | 23°C | 14°C | 33°C 2006 | 7°C 1993 | 46% |
| Sep 13 | 23°C | 14°C | 33°C 2020 | 8°C 2005 | 47% |
| Sep 14 | 23°C | 14°C | 34°C 2006 | 10°C 2003 | 48% |
| Sep 15 | 23°C | 14°C | 35°C 2006 | 10°C 2016 | 49% |
| Sep 16 | 23°C | 14°C | 32°C 2019 | 8°C 2001 | 49% |
| Sep 17 | 23°C | 14°C | 33°C 2012 | 6°C 2001 | 51% |
| Sep 18 | 23°C | 14°C | 33°C 2012 | 9°C 2013 | 53% |
| Sep 19 | 23°C | 14°C | 35°C 2012 | 10°C 1992 | 54% |
| Sep 20 | 23°C | 14°C | 29°C 1993 | 9°C 1995 | 54% |
| Sep 21 | 23°C | 14°C | 32°C 1994 | 9°C 2002 | 56% |
| Sep 22 | 23°C | 14°C | 31°C 2004 | 9°C 2008 | 56% |
| Sep 23 | 23°C | 14°C | 31°C 2015 | 10°C 2002 | 58% |
| Sep 24 | 23°C | 14°C | 33°C 1994 | 11°C 2013 | 60% |
| Sep 25 | 23°C | 14°C | 34°C 1994 | 8°C 2013 | 62% |
| Sep 26 | 23°C | 14°C | 33°C 2020 | 7°C 2012 | 62% |
| Sep 27 | 23°C | 14°C | 35°C 2020 | 8°C 2013 | 63% |
| Sep 28 | 23°C | 14°C | 29°C 2009 | 10°C 2016 | 64% |
| Sep 29 | 23°C | 15°C | 30°C 1999 | 11°C 2009 | 64% |
| Sep 30 | 23°C | 15°C | 33°C 2020 | 10°C 2009 | 64% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-3).
- September 1
- sunrise 6:29 AM, sunset 6:05 PM
- September 30
- sunrise 5:58 AM, sunset 6:16 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.