Con Dao (Con Son) weather in May
May in Con Dao: sweltering, soaked, with clean air — fine if you can take 23 rainy days.
Updated September 2026 · climate normals from ERA5 reanalysis
#5 of 12 months in Con Dao · #888 of 1413 destinations to visit in May · comfort 76/100 (tier B)
- Days
- 32°C
- Nights
- 26°C
- Wet days
- 23
- Sun
- 10.5 h
- Humidity
- 82%
- Daylight
- 13 h
Traveller notes on Con Dao in May
Other months in Con Dao
Con Đảo's forum places September inside southern Vietnam's June-through-October monsoon window, but posters were clear it's rarely a washout - the typical pattern is an hour or so of rain that clears back to sun, with some visitors reporting genuinely sunny, hot days and rain arriving mainly late in the evening or overnight. Mainland weather forecasts were repeatedly called unreliable for the island specifically, so posters recommended just watching the sky rather than trusting an app. Flexible plans matter more than picking an exact date within the month.
Forum posters consistently name March among the best months here, with sunny, warm weather and calm, clear seas typical this time of year - part of a broader dry season posters place roughly October through March for southern Vietnam generally, though some extend Con Dao's own good-weather window all the way to December. Posters are clear Con Dao runs its own genuine microclimate distinct from the mainland: forecasts based on general southern Vietnam conditions are often wrong for the island specifically, so posters recommend treating mainland weather apps as unreliable and instead checking conditions once actually on Con Dao or close to departure.
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Con Dao climate normals — May
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Con Dao in May
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusyReunification Day holidays, school holidays in 2 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Con Dao's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherCon Dao's weather peaks February–April, best around March.
Best weatherFair weatherToughest weather
What's on in Con Dao in May
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Calm seas and clear water
1 Mar – 30 Jun · usuallyDive seasonBetween the two monsoons the crossing settles and the water over the reef clears. These are the weeks the dive boats actually reach the outer islands instead of turning back at the headland.
- Nature
Sea turtle nesting
15 Apr – 31 Oct · usuallyBook earlyGreen turtles come ashore on Bay Canh and the smaller islets, most of them between May and October. The national park runs overnight ranger trips and hatchling releases, and the places on them are limited. Source ↗
- Holiday
Reunification Day holidays
30 Apr – 3 MayNational holidayCrowdedBook earlyFour days off across the country, and Con Dao is one of the places the mainland flies to. Rooms and the Con Son flights go early and cost more than at any other point in the year. Source ↗
Nearby, and something's on
Within 300 km of Con Dao — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Con Dao?
Con Dao in May — FAQ
- Is May a good time to visit Con Dao?
- May in Con Dao: sweltering, soaked, with clean air — fine if you can take 23 rainy days. It ranks #5 of 12 months for Con Dao on SeasonMap's comfort score (76/100).
- What is the weather like in Con Dao in May?
- In May, Con Dao averages a daily high of 31.5°C and a low of 26°C, with about 184.2 mm of rain over roughly 22.6 rainy days.
- What is the air quality in Con Dao in May?
- Con Dao has a mean US Air Quality Index of about 38 in May.
Within 300 km: Ho Chi Minh City's Reunification Day and May Day on 30 Apr – 1 May.