Weather in Guangzhou in May

A hard month. May is a hard month in Guangzhou, and worth planning around. You should expect rain on 20 days of the month, which is more days wet than dry.

May ranks 8 of 12 in Guangzhou: past the worst of the year but short of December, which is the month to book if the dates are open.

Rain on 20 of the month's 31 days, 10 of them heavy. At that frequency a wet-weather backup is not a contingency, it is the itinerary — book the indoor things first and treat the clear days as the bonus. Natural fibres and a second shirt for the day. At 83% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 20 days top 30 °C, making the heat continuous rather than occasional. Across the twenty years measured, the hottest May day reached 36.8 °C and the coldest night fell to 15.2 °C, and the wettest single day dropped 89 mm — roughly 30% 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 581 mm against 170 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 298 mm average is a reasonable planning figure, not a promise.

Wind is light at 8.4 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 83%, high enough to notice on the warm days without dominating them.

How May sits in the year

Temperatures hold steady either side: 29.2 °C in April, 30.7 here, 31 in June. Nothing about the timing within the month matters much. Rain has already shifted: 5 days more than April had.

Daylight in May

May is at or near the longest days of Guangzhou's year: 13.2 hours of daylight, gaining 0.5 hours across the month. Evenings are the real gain — dinner outdoors still happens in full light.

An inland climate

Despite being inland, the year stays fairly even: 23 °C between the year's warmest afternoons and coldest nights.

How busy it gets

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

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

May in Guangzhou versus nearby

If Guangzhou is one option among several, the nearby comparison is worth making. Shenzhen is close enough to be a coin toss — within a degree on temperature, 1 day less rain. Haiphong is close enough to be a coin toss — within a degree on temperature, 2 days less rain.

So: May is a compromise. December is 45 points better and is what Guangzhou is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Guangzhou

See all twelve months in Guangzhou, or where else to go in May.