Weather in Xi’an in May

A good month. May is a solid month to be in Xi’an. Highs average 29.5 °C, lows 15.5 °C, and rain falls on 10 days — nothing in the month is working against you.

May ranks 6 of 12 in Xi’an: past the worst of the year but short of March, which is the month to book if the dates are open.

Rain on 10 days, 2 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 29.5 °C days and 15.5 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 15 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest May day reached 38.9 °C and the coldest night fell to 6.3 °C, and the wettest single day dropped 47 mm — roughly 68% of the month's rain in one day.

May is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest May on record still delivered 121 mm against 17 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 69 mm average is a reasonable planning figure, not a promise.

Wind is light at 6 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 51%.

How May sits in the year

The month is on the way up: 4.6 °C warmer than April, and June adds another 4.2 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in May

May is at or near the longest days of Xi’an's year: 13.9 hours of daylight, gaining 0.7 hours across the month. Evenings are the real gain — dinner outdoors still happens in full light.

An inland climate

With no coast nearby, the year swings a fair way — 37.4 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage. Within May itself the daily swing is 14 °C, so mornings and afternoons need different clothes.

How busy it gets

Shoulder. The value months — prices ease off and you get the place closer to itself.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

May in Xi’an versus nearby

If Xi’an is one option among several, the nearby comparison is worth making. Wuzhong is a better bet in May — 3.1 °C cooler, 6 days less rain. Chongqing is the weaker option in May — within a degree on temperature, 7 days more rain.

So: May works, with March the better month by 17 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Xi’an

See all twelve months in Xi’an, or where else to go in May.