Hạ Long Weather in September
Average highs run from 30°C on September 1 to 29°C on September 30, and lows from 26°C to 23°C. Normal precipitation for the month is 231 mm over about 18 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
- 30°C
- Average low
- 25°C
- Precipitation
- 231 mm
- Reanalysis high
- 35°CSep 8, 2009
- Reanalysis low
- 17°CSep 28, 1997
- Daylight
- 12 h 33 min to 11 h 59 min
- Cloud cover
- 70%
- Humidity
- 83%
- Dew point
- 24°C
- Wind
- 10.8 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 | 30°C | 26°C | 34°C 2011 | 24°C 1998 | 75% |
| Sep 2 | 30°C | 26°C | 33°C 2020 | 24°C 2001 | 77% |
| Sep 3 | 30°C | 25°C | 33°C 2020 | 24°C 1996 | 77% |
| Sep 4 | 30°C | 25°C | 33°C 1991 | 23°C 2007 | 77% |
| Sep 5 | 30°C | 25°C | 33°C 2009 | 23°C 2007 | 77% |
| Sep 6 | 30°C | 25°C | 34°C 2009 | 22°C 2007 | 76% |
| Sep 7 | 30°C | 25°C | 34°C 2009 | 23°C 2013 | 75% |
| Sep 8 | 30°C | 25°C | 35°C 2009 | 21°C 2000 | 74% |
| Sep 9 | 30°C | 25°C | 34°C 1991 | 20°C 2004 | 72% |
| Sep 10 | 30°C | 25°C | 33°C 1991 | 20°C 2006 | 72% |
| Sep 11 | 30°C | 25°C | 32°C 2005 | 20°C 2006 | 70% |
| Sep 12 | 30°C | 25°C | 32°C 1991 | 20°C 2006 | 68% |
| Sep 13 | 30°C | 25°C | 32°C 2014 | 21°C 2006 | 68% |
| Sep 14 | 30°C | 25°C | 33°C 2019 | 20°C 2012 | 67% |
| Sep 15 | 30°C | 25°C | 32°C 2009 | 19°C 2000 | 65% |
| Sep 16 | 30°C | 24°C | 32°C 2007 | 21°C 2000 | 63% |
| Sep 17 | 30°C | 24°C | 33°C 2001 | 22°C 2002 | 60% |
| Sep 18 | 30°C | 24°C | 33°C 1991 | 21°C 1991 | 58% |
| Sep 19 | 30°C | 24°C | 33°C 1991 | 22°C 2007 | 58% |
| Sep 20 | 30°C | 24°C | 33°C 1991 | 20°C 2007 | 57% |
| Sep 21 | 30°C | 24°C | 32°C 2010 | 19°C 1997 | 55% |
| Sep 22 | 30°C | 24°C | 32°C 2008 | 18°C 1997 | 54% |
| Sep 23 | 30°C | 24°C | 33°C 2008 | 20°C 2002 | 52% |
| Sep 24 | 30°C | 24°C | 33°C 1991 | 21°C 2019 | 52% |
| Sep 25 | 30°C | 24°C | 33°C 1991 | 20°C 1997 | 50% |
| Sep 26 | 30°C | 24°C | 33°C 1991 | 18°C 1997 | 49% |
| Sep 27 | 30°C | 24°C | 32°C 2016 | 18°C 1997 | 50% |
| Sep 28 | 29°C | 23°C | 32°C 1993 | 17°C 1997 | 50% |
| Sep 29 | 29°C | 23°C | 33°C 2015 | 18°C 1997 | 49% |
| Sep 30 | 29°C | 23°C | 32°C 2014 | 20°C 2012 | 49% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+7).
- September 1
- sunrise 5:35 AM, sunset 6:08 PM
- September 30
- sunrise 5:42 AM, sunset 5:41 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.