Vientiane in september: average Weather, Temperature and Climate
Weather in Vientiane in september 2025
The weather in Vientiane in september comes from statistical datas on the past years. You can view the weather statistics for all the month, but also by using the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
tolerable weather UV index: 7
Weather at 6am
77°F
Moderate rain at times
32% of time
24%
20%
14%
Weather at 12pm
90°F
Moderate rain at times
42% of time
19%
17%
16%
Weather at 6pm
81°F
Moderate rain at times
31% of time
29%
19%
15%
Weather at 3am
76°F
35%
23%
16%
14%
Evolution of daily average temperature and precipitation in Vientiane in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Vientiane in september.
The climate of Vientiane in september is tolerable
The climate in september in Vientiane is wet (with 14.3in of rainfall over 17 days). It should be noted an improvement from the previous month since in august it receives an average of 20.3in of precipitation over 22 days.
The climate is very hot there in september. The high seasonal norm is 90°F. The seasonal minimum is 77°F. Thus, the mean temperature average in september in Vientiane is 85°F. Note that these seasonal averages are in contrast with those observed in Vientiane in the month of september with a maximum record of 97°F in 2014 and a minimum record of 70°F in 2009. You can expect to have about 25 days with temperatures up to 86°F, or 83 of time.
In september in Vientiane, the days on average last 12:14. Sunrise is at 05:58 and sunset is at 18:12.
With a correct weather, the month of september is okay (but not the best) to go in Vientiane.
Vientiane: another month?
If you can push back the dates of your trip, we advise you to go in october to Vientiane. more information
September: another location in Laos?
If you want to go to Laos in september, there are destinations with better weather than Vientiane:
In september, Luang Prabang has good weather.
Seasonal average climate and temperature of Vientiane in september
Check below seasonal norms These statistics are set from the weather statements of the past years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 85°F | ||||
| Highest temperature | 90°F | ||||
| Lowest temperature | 77°F | ||||
| Highest record temperature | 97°F (2014) | ||||
| Lowest record temperature | 70°F (2009) | ||||
| Number of days at +86°F | 25 day(s) (83%) | ||||
| Number of days at +65°F | 30 day(s) (100%) | ||||
| Wind | |||||
| Wind speed | 8km/h | ||||
| Wind temperature | 77°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 14.3in | ||||
| Number of days with rainfall | 17 day(s) (56%) | ||||
| Record daily rainfall | 6in (2015) | ||||
| Other climate data | |||||
| Humidity | 93% | ||||
| Visibility | 8.5km | ||||
| Cloud cover | 45% | ||||
| UV index | 7 | ||||
| Daily sunshine hours | 12 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 05:58 | ||||
| Time of sunset | 18:12 | ||||
| Length of day | 12:14 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | tolerable | ||||
How was the weather last september?
Here is the day by day recorded weather in Vientiane in september 2024:
76°F to 90°F
76°F to 90°F
76°F to 90°F
76°F to 90°F
76°F to 88°F
74°F to 92°F
76°F to 90°F
77°F to 86°F
76°F to 85°F
76°F to 86°F
74°F to 88°F
76°F to 86°F
74°F to 83°F
76°F to 85°F
76°F to 88°F
76°F to 88°F
74°F to 90°F
76°F to 85°F
74°F to 86°F
72°F to 76°F
74°F to 83°F
76°F to 77°F
74°F to 76°F
72°F to 74°F
72°F to 77°F
72°F to 85°F
74°F to 90°F
76°F to 92°F
76°F to 90°F
77°F to 83°F
Map: other cities in Laos in september
Cities near Vientiane:
| Vang Vieng in september | tolerable weather |
| Phonsavan in september | tolerable weather |
| Luang Prabang in september | good weather |
| Thakhek in september | tolerable weather |
| Savannakhet in september | tolerable weather |
| Nong Kiau in september | bad weather |
| Houei Sai in september | tolerable weather |
| Luang Namtha in september | tolerable weather |
| Pakse in september | very bad weather |
| Khong island (Don Khong) in september | bad weather |
Click over cities on the map for information about the weather in september.
Vientiane
perfect weather
good
tolerable
bad
very bad
Weather data for Vientiane in september:
Weather data for Vientiane for september are derived from an average of the weather forecast since 2009 in Vientiane. There is a margin of error and these forecasts are to be considered as general information only. The weather in Vientiane can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Vientiane.