Vientiane vs Udon Thani: which is sunnier?
🇱🇦 Laos vs 🇹🇭 Thailand · 71 km apart · long-term climate normals (NASA POWER, 2001–2020)
Vientiane and Udon Thani are virtually tied for annual sunshine — about 2,437 vs 2,438 hours a year. Vientiane has the higher Sunshine Score in 3 of 12 months; the other 9 are within 2 points.
Scores are the 0–100 Sunshine Score — sunshine, daytime warmth and dryness in one number, per month.
At a glance
| Vientiane | Udon Thani | |
|---|---|---|
| Sunshine hours / year | 2,437 | 2,438 |
| Sunniest month | January (92/100) | January (92/100) |
| Nov–Feb average score | 91/100 | 89/100 |
| Jun–Aug average score | 66/100 | 66/100 |
| Rain / year | 1,215 mm | 1,323 mm |
| Peak midday UV | 10 (very high) | 10 (very high) |
Vientiane vs Udon Thani month by month
| Month | Sunshine Score | Day high °C | Rain mm | |||
|---|---|---|---|---|---|---|
| Vientiane | Udon Thani | Vientiane | Udon Thani | Vientiane | Udon Thani | |
| January | 92 | 92 | 28° | 29° | 8 | 8 |
| February | 91 | 81 | 32° | 33° | 13 | 16 |
| March | 61 | 52 | 35° | 36° | 35 | 39 |
| April | 41 | 40 | 37° | 37° | 61 | 73 |
| May | 53 | 53 | 34° | 34° | 168 | 187 |
| June | 66 | 66 | 32° | 32° | 170 | 179 |
| July | 66 | 66 | 31° | 31° | 203 | 203 |
| August | 66 | 66 | 30° | 30° | 246 | 257 |
| September | 66 | 66 | 30° | 30° | 204 | 234 |
| October | 78 | 74 | 30° | 29° | 85 | 102 |
| November | 90 | 90 | 29° | 29° | 16 | 18 |
| December | 92 | 92 | 27° | 28° | 6 | 7 |
The sunnier month by month: Jan even · Feb Vientiane · Mar Vientiane · Apr even · May even · Jun even · Jul even · Aug even · Sep even · Oct Vientiane · Nov even · Dec even.
When to pick which
- November–February: too close to call — Vientiane averages 91/100, Udon Thani 89/100. Daytime highs are similar (29°C vs 30°C). See the winter sun ranking.
- March–May: Vientiane (average score 52/100 vs 48). Daytime highs are similar (35°C vs 36°C).
- June–August: too close to call — Vientiane averages 66/100, Udon Thani 66/100. Daytime highs are similar (31°C vs 31°C).
- September–October: too close to call — Vientiane averages 72/100, Udon Thani 70/100. Daytime highs are similar (30°C vs 30°C).
Full month-by-month guides: Vientiane weather by month · Udon Thani weather by month · Best time to visit Thailand.
More comparisons: Vientiane vs Khon Kaen · Vientiane vs Phitsanulok · Udon Thani vs Ubon Ratchathani · Udon Thani vs Khon Kaen · Udon Thani vs Phitsanulok · all head-to-heads