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 heavy rainfall in September, with over 20 rainy days and an average total precipitation 502.3 mm.
Is September a good time to visit Vientiane? check out the best time to travel to Vientiane page.
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Temperatures
Rain 🌧️
More
0
Dry days
30
Rainy days
0
Snow days
29°/23°
Temperatures
8 km/h
Avg max wind
87 %
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° |
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Temperatures trend during September in Vientiane
See the weather trend as well as the moving average line
September weather day by day
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| 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 | |
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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 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.
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 ☀️
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