Vientiane
September
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.
2
Dry days
28
Rainy days
0
Snow days
29°/23°
Temperatures
9 km/h
Avg max wind
88 %
Avg humidity
Vientiane in September average weather
Move between months or click on a day
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  32° | 2  31° | 3  33° | 4  32° | 5 32° | 6 32° | 7 31° |
| 8 30° | 9 30° | 10 30° | 11 29° | 12 29° | 13  27° | 14 26° |
| 15 29° | 16 29° | 17 30° | 18 29° | 19 31° | 20 27° | 21 30° |
| 22 29° | 23 28° | 24 27° | 25 29° | 26 27° | 27 30° | 28 30° |
| 29 30° | 30  27° |
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.
Temperatures trend during September in Vientiane
See the weather trend as well as the moving average line
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 | 32° /23° | 14.3 mm | 7 | |
| 2 Sept. | Torrential rain shower | 31° /23° | 33.1 mm | 7 | |
| 3 Sept. | Patchy rain possible | 33° /23° | 12.9 mm | 7 | |
| 4 Sept. | Patchy light rain with thunder | 32° /24° | 16.9 mm | 7 | |
| 5 Sept. | Light rain shower | 32° /23° | 18.4 mm | 7 | |
| 6 Sept. | Moderate or heavy rain shower | 32° /22° | 37.1 mm | 7 | |
| 7 Sept. | Moderate or heavy rain shower | 31° /23° | 28.2 mm | 7 | |
| 8 Sept. | Light rain shower | 30° /23° | 21.7 mm | 7 | |
| 9 Sept. | Patchy light rain with thunder | 30° /23° | 36.8 mm | 7 | |
| 10 Sept. | Light rain shower | 30° /23° | 23 mm | 7 | |
| 11 Sept. | Light rain shower | 29° /22° | 54.4 mm | 7 | |
| 12 Sept. | Moderate or heavy rain shower | 29° /23° | 8.6 mm | 7 | |
| 13 Sept. | Mist | 27° /22° | 1.9 mm | 6 | |
| 14 Sept. | Fog | 26° /22° | 13.1 mm | 6 | |
| 15 Sept. | Fog | 29° /23° | 1.4 mm | 7 | |
| 16 Sept. | Light rain shower | 29° /22° | 18.9 mm | 7 | |
| 17 Sept. | Light rain shower | 30° /22° | 24.8 mm | 7 | |
| 18 Sept. | Moderate or heavy rain shower | 29° /22° | 30.2 mm | 6 | |
| 19 Sept. | Light rain shower | 31° /22° | 6.5 mm | 7 | |
| 20 Sept. | Patchy light rain with thunder | 27° /21° | 9.8 mm | 6 | |
| 21 Sept. | Moderate or heavy rain shower | 30° /22° | 5.1 mm | 7 | |
| 22 Sept. | Patchy rain possible | 29° /23° | 13.8 mm | 6 | |
| 23 Sept. | Light rain shower | 28° /22° | 11.9 mm | 6 | |
| 24 Sept. | Patchy rain possible | 27° /22° | 10.6 mm | 6 | |
| 25 Sept. | Patchy rain possible | 29° /22° | 2.3 mm | 7 | |
| 26 Sept. | Light rain shower | 27° /21° | 9 mm | 6 | |
| 27 Sept. | Light rain shower | 30° /22° | 4.3 mm | 7 | |
| 28 Sept. | Light rain shower | 30° /22° | 8.9 mm | 7 | |
| 29 Sept. | Light rain shower | 30° /22° | 12.9 mm | 7 | |
| 30 Sept. | 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
You are here
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.