Weather in Vientiane for September 2025
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.
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Vientiane in September average weather
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
September weather day by day
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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Vientiane in September - FAQ
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
UV exposure in Vientiane during September
Quick links
Get accurate weather forecasts for Vientiane, located at latitude 17.967 and longitude 102.6. Stay updated with localized weather information tailored for Vientiane.