Lai Châu in Summer
In summer (June, July and August), Lai Châu sees average daytime highs around 28°C and overnight lows near 21°C, with 1085 mm of rain over about 87 wet days across the season. It is the warmest season of the year and the wettest season of the year.
Across summer, daytime highs hold fairly steady around 28°C. The sky is clear or mostly clear about 4% of the time across summer, and the air most often feels muggy.
Summer is Lai Châu's weakest season of the year to visit on our travel score. For the whole year in context, see Lai Châu's year-round climate.
- Avg daytime high
- 28°C
- warmest season of the year
- Avg overnight low
- 21°C
- Rainfall
- 1085 mm
- 87 wet days
- Avg wind
- 3 km/h
- Travel score
- 3.4
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in Lai Châu in Summer
Across summer, daytime highs hold fairly steady around 28°C.
A typical summer day in Lai Châu reaches about 28°C and drops to 21°C overnight. The warmest of the three months is August, the coolest August.
Lai Châu weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 18° / 10° | 63 | 10 | 10.8 | 5.9 |
| Feb | 20° / 11° | 53 | 9.4 | 11.2 | 6.4 |
| Mar | 24° / 14° | 106 | 13.8 | 11.8 | 6.5 |
| Apr | 26° / 17° | 136 | 18.7 | 12.5 | 5.4 |
| May | 27° / 20° | 222 | 24.4 | 13.1 | 4.3 |
| Jun | 28° / 21° | 325 | 28.5 | 13.3 | 3.4 |
| Jul | 27° / 22° | 389 | 29.5 | 13.2 | 3.4 |
| Aug | 28° / 21° | 371 | 28.7 | 12.8 | 3.5 |
| Sep | 27° / 20° | 201 | 22.2 | 12.1 | 4.5 |
| Oct | 25° / 18° | 96 | 15 | 11.5 | 6.0 |
| Nov | 22° / 14° | 50 | 8.7 | 10.9 | 6.9 |
| Dec | 19° / 11° | 49 | 7.4 | 10.7 | 6.5 |
Cloud cover in Summer
The sky is clear or mostly clear about 4% of the time across summer.
Chance of precipitation in Summer
Lai Châu gets around 1085 mm of rain over 87 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 3 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 18 min in early June to 12 h 30 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 4.3 kWh/m².
Hazard calendar for Lai Châu
In summer, Lai Châu overlaps its monsoon season. The full year is below, with each hazard's peak months called out.
Lai Châu's monsoon runs May–September, when most of the year's rain falls.
Is summer a good time to visit Lai Châu?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a weaker month for outdoor sightseeing in Lai Châu.
What to pack for Lai Châu in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Lai Châu sees daytime highs around 28°C and nights near 21°C. Pack light clothes and rain gear. About 87 days see rain.
UV index in Lai Châu in Summer
Clear-sky midday UV across summer averages around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Lai Châu peaks around June 19 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 5 (high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 7 | 9 | 11 | 9 | 11 | 14 | 13 | 12 | 10 | 9 | 8 | 5 |
| Level | High | Very high | Extreme | Very high | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Very high | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 7 | High |
| Feb | 9 | Very high |
| Mar | 11 | Extreme |
| Apr | 9 | Very high |
| May | 11 | Extreme |
| Jun | 14 | Extreme |
| Jul | 13 | Extreme |
| Aug | 12 | Extreme |
| Sep | 10 | Very high |
| Oct | 9 | Very high |
| Nov | 8 | Very high |
| Dec | 5 | High |
Air quality in Lai Châu in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Lai Châu is worst in April — around 70 µg/m³ PM2.5 (unhealthy), about 5.0× the cleanest month (July, 14 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 25 | 33 | 54 | 70 | 28 | 15 | 14 | 15 | 18 | 22 | 23 | 25 |
| Level | Moderate | Moderate | Poor | Unhealthy | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 25 | Moderate |
| Feb | 33 | Moderate |
| Mar | 54 | Poor |
| Apr | 70 | Unhealthy |
| May | 28 | Moderate |
| Jun | 15 | Moderate |
| Jul | 14 | Moderate |
| Aug | 15 | Moderate |
| Sep | 18 | Moderate |
| Oct | 22 | Moderate |
| Nov | 23 | Moderate |
| Dec | 25 | Moderate |
Where is Lai Châu?
Lai Châu sits at 22.4°N, 103.5°E, 919 m above sea level, in Vietnam. The nearest listed city is Sapa, 40 km away.
Topography around Lai Châu
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Lai Châu.
Within 3 km, the terrain around Lai Châu has significant variations in elevation — a maximum elevation change of 544 m around an average of 1,001 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 2,836 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,035 m.
The land around Lai Châu is covered by trees (43%) and grassland (32%) within 3 km, trees (74%) within 16 km, and trees (85%) within 80 km.
Vietnam travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type A / B / C / F
- 220 V · 50 Hz
- Prices
- ≈ 29% of US
- price level, 2025
- GDP per capita
- $5,066
- 2025
- Happiness
- 6.4 / 10
- World Happiness, 2025
- Safe drinking water
- 59%
- of population, 2024
- Homicide rate
- 1.5
- per 100k, 2011
- Road deaths
- 30.6
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Moderate
- EF EPI 500
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Lai Châu (22.3964°, 103.4582°, elevation 919 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.