easeweather.com

Weather in Vientiane for September 2025

Your guide to Vientiane weather in September - trends and predictions
  • In general, the average temperature in Vientiane at the beginning of September is 31.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 28.6 °C by the end of September.

  • Vientiane experiences an exceptionally high level of rainfall in September, with more than 24 rainy days on average.

  • Is September a good time to visit Vientiane? check out the best time to travel to Vientiane page.

  • New! Chat with our AI weatherman - it’s amazing and free.
Average dry days
2
Dry days
Average rainy days
28
Rainy days
Average snowy days
0
Snow days
Average temperatures
29°/23°
Temperatures
Average wind speed
9 km/h
Avg max wind
Average humidity
88 %
Avg humidity

Vientiane in September average weather

Move between months or click on a day
Select a date

You can click on date

Access Vientiane weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Got it

Temperatures trend during September in Vientiane

See the weather trend as well as the moving average line
Weather Expert

Are you interested in traveling to Vientiane in September?

Leave your details and get the best deals for September. Speak with a holiday expert specializing in Vientiane today.

September weather day by day

Click on a date for more information
Date Weather Temperatures Rain UV More
1 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
32° /23° 14.3 mm 7
2 Sept. Torrential rain shower
Torrential rain shower
31° /23° 33.1 mm 7
3 Sept. Patchy rain possible
Patchy rain possible
33° /23° 12.9 mm 7
4 Sept. Patchy light rain with thunder
Patchy light rain with thunder
32° /24° 16.9 mm 7
5 Sept. Light rain shower
Light rain shower
32° /23° 18.4 mm 7
6 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
32° /22° 37.1 mm 7
7 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
31° /23° 28.2 mm 7
8 Sept. Light rain shower
Light rain shower
30° /23° 21.7 mm 7
9 Sept. Patchy light rain with thunder
Patchy light rain with thunder
30° /23° 36.8 mm 7
10 Sept. Light rain shower
Light rain shower
30° /23° 23 mm 7
11 Sept. Light rain shower
Light rain shower
29° /22° 54.4 mm 7
12 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
29° /23° 8.6 mm 7
13 Sept. Mist
Mist
27° /22° 1.9 mm 6
14 Sept. Fog
Fog
26° /22° 13.1 mm 6
15 Sept. Fog
Fog
29° /23° 1.4 mm 7
16 Sept. Light rain shower
Light rain shower
29° /22° 18.9 mm 7
17 Sept. Light rain shower
Light rain shower
30° /22° 24.8 mm 7
18 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
29° /22° 30.2 mm 6
19 Sept. Light rain shower
Light rain shower
31° /22° 6.5 mm 7
20 Sept. Patchy light rain with thunder
Patchy light rain with thunder
27° /21° 9.8 mm 6
21 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
30° /22° 5.1 mm 7
22 Sept. Patchy rain possible
Patchy rain possible
29° /23° 13.8 mm 6
23 Sept. Light rain shower
Light rain shower
28° /22° 11.9 mm 6
24 Sept. Patchy rain possible
Patchy rain possible
27° /22° 10.6 mm 6
25 Sept. Patchy rain possible
Patchy rain possible
29° /22° 2.3 mm 7
26 Sept. Light rain shower
Light rain shower
27° /21° 9 mm 6
27 Sept. Light rain shower
Light rain shower
30° /22° 4.3 mm 7
28 Sept. Light rain shower
Light rain shower
30° /22° 8.9 mm 7
29 Sept. Light rain shower
Light rain shower
30° /22° 12.9 mm 7
30 Sept. Patchy light drizzle
Patchy light drizzle
27° /23° 11.4 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.

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 689.8 mm is expected in Vientiane during September, occurring over more than 28 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 9 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Vientiane in September?

As you prepare for your trip to Vientiane in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Vientiane, during September, is comfortable and enjoyable, regardless of the weather conditions.

  • Clothing
    • Lightweight Clothing: T-shirts, blouses, shorts, skirts
    • Rain Gear: Lightweight, waterproof clothing
  • Footwear
    • Waterproof Shoes
    • Sandals/Flip-flops: Comfortable for warm climates
  • Accessories
    • Sunglasses: For sun protection
    • Sun Hats: Wide-brimmed hats for sun protection in warm weather
    • Umbrellas/Raincoats: For rainy days
  • Personal Items
    • Sunscreen: High SPF for sunny destinations
    • Lip Balm with SPF: To protect against chapped lips

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 ☀️

Quick links

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.

Related locations
Select a location for accurate weather forecast
More Locations
Found a mistake?
We appreciate your attention to details. Tell us here.