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Weather extremes

How extreme does Vientiane's weather get?

The hottest, coldest, wettest and snowiest days Vientiane has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.

Based on 34 years of daily weather observations (1991–present), from the Wattay Intl station 5 km away. Updated through August 2025 — an all-time extreme only changes when a more extreme day actually occurs, so some dates are old. That is normal, not stale data.

The four kinds of extreme

The hottest, coldest, wettest and snowiest single days Vientiane has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
109°F Apr 30, 2024

That is about 14°F hotter than a normal April afternoon in Vientiane (typical high near 95°F).

The three most extreme on record

1 109°F Apr 30, 2024recent
2 109°F May 6, 2023
3 109°F Apr 27, 2024
❄️ Coldest night
45°F Dec 24, 1999

About 19°F colder than a normal December night in Vientiane (typical low near 64°F).

The three most extreme on record

1 45°F Dec 24, 1999
2 45°F Dec 25, 1999
3 46°F Jan 28, 1991
🌧️ Most rain in one day
8.50 in Feb 26, 2011

More rain in a single day than Vientiane usually gets in the whole month of February (typical February total about 0.6 in).

The three most extreme on record

1 8.50 in Feb 26, 2011
2 6.06 in Jul 31, 2006
3 5.46 in Sep 8, 2020

How hot and cold it gets, month by month

The shaded band is the normal range of daily temperatures for each month. The dots show the most extreme it has ever been — so you can see how far beyond a normal day the records really sit.

30°50°70°90°110°130° all-time high 109°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Vientiane's record heat sits well above even a hot day for the season — April's 109°F is about 14°F beyond a normal hot afternoon. Its record cold is just as far below a normal winter night — the dots mark how rare each extreme really is.

In plain terms

In a normal year, Vientiane's warmest days reach the mid-90s°F and its coldest nights drop to the mid-60s°F. But across the record it has gone as high as 109°F and as low as 45°F. A single day has delivered over 9 inches of rain. Those are the outer edges worth knowing if you are moving here, planning a trip, or thinking about a house.
Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Wattay Intl, a weather station, about 5 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →