In May, it is hotter than last month. And the highest average temperature stays at nearly 23℃/73.4℉. There are mostly cloudy and rainy days.

Average Maximum Average Minimum Highest Maximum Lowest Minimum
23 16 29 14
73.4 60.8 84.2 57.2

Cloudy Days: 16 days
Overcast Days: 4 days
Rainy Days: 11 days

What to wear and bring

Early May
In early May, there is a lot of rainfall with a few cloudy and overcast days. During this period, the temperature is between 14℃/57.2℉ and 25℃/77℉. It is recommended that you wear clothing like cool coats and shorts. Bringing your rain gear is necessary.
Tips:
Weather on the Chinese Labor Day (May 1st)
On Labor Day (May 1st), it often rains lightly, and the highest temperature stays around 25℃/77℉. It is recommended that you wear shirts, and dresses or light weight pants.

Mid-May
Compared to early May, it is hotter in this period, when the maximum temperature gets up to 29℃/84.2℉. There are mostly cloudy days, and it is recommended that you wear skirts and shorts. You also need to pay attention to sunscreen.

Late May
The weather situation is similar to mid-May, when the temperature is between 14℃/57.2℉ and 29℃/84.2℉. There are mostly cloudy days and it rains lightly for a couple of days. Wearing cool clothing like shorts or cool long pants is adequate.

Historical Guiyang Weather in May

historical guiyang weather in mayclick here to enlarge