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Weather in Vientiane for September 2025

Your guide to Vientiane weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Vientiane is slightly cooler than the historical average by -0.7 °C.

  • The forecast for the next days in Vientiane predicts temperatures to be around 29 °C, close to the historical average.

  • In general, the average temperature in Vientiane at the beginning of September is 31.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 27.7 °C by the end of September.

    • Rain 🌧️

  • Vientiane experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 502.3 mm.

Average dry days
0
Dry days
Average rainy days
30
Rainy days
Average snowy days
0
Snow days
Average temperatures
29°/23°
Temperatures
Average wind speed
8 km/h
Avg max wind
Average humidity
87 %
Avg humidity

Vientiane Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Light rain shower
32°
2
Light rain shower
31°
3
Patchy rain possible
31°
4
Patchy light rain with thunder
32°
5
Light rain shower
32°
6
Moderate or heavy rain shower
31°
7
Patchy light rain with thunder
31°
8
Light rain shower
31°
9
Light rain shower
29°
10
Light rain shower
29°
11
Light rain shower
29°
12
Moderate or heavy rain shower
30°
13
Mist
28°
14
Fog
28°
15
Fog
28°
16
Light rain shower
28°
17
Light rain shower
30°
18
Heavy rain
31°
19
Heavy rain
31°
20
Heavy rain
28°
21
Moderate rain
30°
22
Moderate rain
29°
23
Moderate rain
30°
24
Patchy rain possible
31°
25
Patchy rain possible
26°
26
Patchy rain possible
29°
27
Patchy rain possible
26°
28
Patchy rain possible
24°
29
Patchy rain possible
27°
30
Patchy rain possible
31°

Temperatures trend during September in Vientiane

See the weather trend as well as the moving average line

September weather in Vientiane day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Light rain shower
Light rain shower
 32° /22° 11.3 mm 7
2 Sept. Light rain shower
Light rain shower
 31° /23° 30.4 mm 7
3 Sept. Patchy rain possible
Patchy rain possible
 31° /23° 11.6 mm 7
4 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 32° /23° 17.1 mm 7
5 Sept. Light rain shower
Light rain shower
 32° /23° 15.2 mm 7
6 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 31° /22° 28.9 mm 6
7 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 31° /23° 20 mm 7
8 Sept. Light rain shower
Light rain shower
 31° /23° 15.7 mm 7
9 Sept. Light rain shower
Light rain shower
 29° /23° 28.9 mm 6
10 Sept. Light rain shower
Light rain shower
 29° /23° 23.5 mm 6
11 Sept. Light rain shower
Light rain shower
 29° /22° 39.2 mm 6
12 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 30° /22° 9.3 mm 7
13 Sept. Mist
Mist
 28° /22° 7.3 mm 6
14 Sept. Fog
Fog
 28° /22° 10.3 mm 6
15 Sept. Fog
Fog
 28° /22° 3.1 mm 6
16 Sept. Light rain shower
Light rain shower
 28° /22° 15.9 mm 6
17 Sept. Light rain shower
Light rain shower
 30° /22° 24.8 mm 7
18 Sept. Heavy rain
Heavy rain
 31° /23° 21.2 mm 2.8
19 Sept. Heavy rain
Heavy rain
 31° /23° 24.7 mm 2.5
20 Sept. Heavy rain
Heavy rain
 28° /23° 27.1 mm 2.4
21 Sept. Moderate rain
Moderate rain
 30° /23° 8.7 mm 1.3
22 Sept. Moderate rain
Moderate rain
 29° /23° 9.1 mm 6
23 Sept. Moderate rain
Moderate rain
 30° /24° 5.6 mm 6
24 Sept. Patchy rain possible
Patchy rain possible
 31° /24° 0.6 mm 6
25 Sept. Patchy rain possible
Patchy rain possible
 26° /24° 1.7 mm 5
26 Sept. Patchy rain possible
Patchy rain possible
 29° /23° 4.7 mm 6
27 Sept. Patchy rain possible
Patchy rain possible
 26° /23° 4.2 mm 5
28 Sept. Patchy rain possible
Patchy rain possible
 24° /22° 3.8 mm 5
29 Sept. Patchy rain possible
Patchy rain possible
 27° /22° 2.6 mm 5
30 Sept. Patchy rain possible
Patchy rain possible
 31° /22° 0.7 mm 6
Next
Important Notice
Our weather forecast for Vientiane in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Vientiane forecast closer to your planned date for the most up-to-date weather information.
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Vientiane in September - FAQ

What are the expected maximum and minimum temperatures in Vientiane during September?
During September, expect a variety of temperatures with highs around 29° and lows near 23°, suitable for diverse activities and preferences.
How much rainfall should be expected in Vientiane during September?
Significant rainfall exceeding 502.3 mm is expected in Vientiane during September, occurring over more than 30 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Vientiane during September?
The average wind speed in Vientiane during September is 8 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Vientiane

Explore the daily rainfall trends and prepare for Vientianes September weather 💧

UV exposure in Vientiane during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is Vientiane?

Get accurate weather forecasts for Vientiane, located at latitude 17.967 and longitude 102.6. Stay updated with localized weather information tailored for Vientiane.

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