Gansu is a long, narrow province in northwest China that follows the Hexi Corridor, the Silk Road passage between the Qilian Mountains and the Gobi. It joins the Yellow River city of Lanzhou, the Mogao Caves and Mingsha dunes at Dunhuang, the Ming fort at Jiayuguan, the rainbow Danxia hills of Zhangye, and the Tibetan monasteries of Xiahe and Langmusi into one of China's richest cultural and landscape routes.
Gansu spans several climate zones along a 1,600 km arc. Lanzhou, in the Yellow River valley, has a semi-arid continental climate (Koppen BSk) with cold dry winters, warm summers, and about 330 mm of rain a year, mostly July-September. The Hexi Corridor (Zhangye, Jiayuguan, Dunhuang) is true desert, with under 100 mm of rain, very large day-night swings and hot summer afternoons. Gannan (Xiahe, Luqu) sits at 2,900-3,500 m on the Tibetan plateau edge, with cool summers and long, cold winters.
Best time to visit
Summary: The best time to visit Gansu is May-June and September-early October, when most of the province is warm but not extreme and skies are clear; Gannan is best June-September.
Best: May, June, September, early October
Avoid: December-February (extreme cold) and March (wind and dust); Golden Week and the Spring Festival are crowded
Peak Season: July-August and the Golden Week holiday
Notes: Desert regions have large daily temperature swings; even in summer evenings in Dunhuang and Gannan can feel cold, so pack layers year-round
Month-by-month weather
Typical conditions throughout the year.
January
-5°C/23°F
Coldest month in Lanzhou; dry and clear, with some air pollution in the valley. Gannan and the Hexi Corridor are far colder.
February
-1°C/30°F
Still cold and dry; Spring Festival brings a burst of domestic travel and closed shops around the holiday.
March
6°C/43°F
Warming but windy, with occasional dust storms across the Hexi Corridor.
April
12°C/54°F
Mild days and cool nights; Lanzhou blossoms and the first tourists reach Dunhuang.
May
17°C/63°F
Warm and pleasant across most of the province; a good month for Bingling Temple and the Hexi Corridor.
June
21°C/70°F
Warm days and cool evenings; grasslands in Gannan green up and tourism begins to peak.
July
23°C/73°F
Warm in Lanzhou, hot in the desert, and the rainiest month in the east; the busiest tourism season.
August
22°C/72°F
Similar to July with frequent afternoon showers in Lanzhou and Gannan; peak domestic crowds continue.
September
17°C/63°F
Clear, comfortable and less crowded; one of the best months for Dunhuang and Zhangye.
October
11°C/52°F
Crisp and dry, with autumn colour; National Day Golden Week (Oct 1-7) is very crowded.
November
4°C/39°F
Cold arrives quickly; first snow in the highlands and fewer open services.
December
-3°C/27°F
Cold and dry; quiet sights and the lowest prices of the year.
The seasons
What to expect in each part of the year.
Spring
Months: Mar-May
Lanzhou warms from about 6 C in March to 17 C in May. The Hexi Corridor can be windy with occasional dust storms, and Gannan stays cold and snowy into April.
Summer
Months: Jun-Aug
Lanzhou averages 21-23 C with highs near 30 C; Dunhuang is hot and dry with highs of 33-36 C; Gannan is mild with cool nights near freezing. July-August bring the heaviest rain and occasional flash floods or road closures in the mountains.
Fall
Months: Sep-Nov
September and early October are widely regarded as Gansu's best months: clear skies, comfortable days and cool nights. November turns cold quickly, with first snow in Gannan.
Winter
Months: Dec-Feb
Cold and dry. January averages about -4 to -5 C in Lanzhou, around -9 C in Dunhuang and well below -10 C at night in Xiahe and Gannan. Snow is light in the valleys but heavy in the mountains.
Crowds & peak times
When to expect tourists and when to avoid them.
- High Season
- Jul-Aug (summer holidays), the Spring Festival week, and National Day Golden Week (Oct 1-7)
- Shoulder Season
- May-Jun and Sep-early Oct
- Low Season
- Nov-Mar (cold, quiet, lowest prices, some services reduced)
Major events & festivals
Time your visit around what matters.
Spring Festival (Chinese New Year)
China's biggest holiday brings family travel and temple fairs; many small businesses close for several days
Monlam Prayer Festival at Labrang Monastery
Thousands of monks and pilgrims gather in Xiahe for prayers, butter sculptures and the unveiling of giant thangka scrolls
Gannan grassland and horse festivals
Tibetan communities in Gannan host summer festivals with horse racing and traditional performances
National Day Golden Week
One of China's two biggest travel weeks; Dunhuang, Zhangye and Jiayuguan are heavily booked