Quick Summary: Phu Quoc weather splits into a dry season (roughly November/December–April) and a wet season (May–November), with the best time to visit being December to February, when rain is rare and the sea is calm enough for diving and snorkeling. May is the warmest month, averaging 28°C, while rain days climb to a yearly high of 30 in August.
As Vietnam’s largest island, sitting out in the Gulf of Thailand rather than the East Sea, Phu Quoc’s weather runs on a slightly different clock than the mainland delta towns nearby. Surrounding water keeps temperatures more even year-round, but that same position exposes the island to some of the heaviest rainfall totals in southern Vietnam once the monsoon turns.
Phu Quoc Weather at a Glance
- Phu Quoc weather is warmest in April–May, averaging 28–28.1°C, and coolest in January at 26.2°C.
- Dry season runs roughly December–April, though rain days stay in double digits (9–19) even then — higher than mainland delta towns.
- Wet season runs May–November, with rain days peaking at 30 in August, the wettest month recorded on the island.
- Phu Quoc logs around 252 rain days a year — the highest of any southern Vietnam destination in this guide.
Best Time to Visit
December through February is the clear pick for Phu Quoc weather: rain days drop to a relative low of 9–11 a month, seas are calm, and diving and snorkeling visibility is at its best. Even this “dry” window sees more rain than mainland towns nearby, so it’s best to think of it as Phu Quoc’s driest stretch rather than a fully dry season.
Weather by Seasons
Dry Season (December–April): Temperatures run 26.2–28.1°C, with rain days ranging from 9 in February up to 19 in April as the wet season approaches. Sea conditions are calmest during this window, making it the go-to time for boat trips to the southern islands.
Wet Season (May–November): Average temperatures stay a steady 26.3–28°C, but rain days surge to 19–30 per month, with August the wettest at 30 days. According to Kupi.com’s Phu Quoc weather overview, rainfall peaks from July through September, and while showers are frequent, the island’s average temperatures barely move across the year.
Daily Weather & Humidity Insights
Being surrounded by water, Phu Quoc holds humidity high year-round — typically 70–80% even in the driest months, climbing into the mid-80s during peak rains. The day-night temperature gap is narrower than on the mainland, usually around 5–7°C, since the sea moderates both daytime highs and nighttime lows. Afternoon showers in the wet season tend to be heavy but relatively short-lived, often followed by a clear evening.
What to Wear and Pack
- Swimwear and light, breathable clothing for beach days.
- A dive-friendly rash guard or wetsuit top if snorkeling or diving for extended periods.
- A compact rain jacket for sudden wet-season showers, even in the “dry” months.
- Reef-safe sunscreen — Phu Quoc’s coral areas are sensitive to regular sunscreen chemicals.
- Water shoes for rocky patches of coastline and boat landings.
Essential Local Tips
- Book diving and snorkeling trips for the December–April window, when visibility and sea conditions are most reliable.
- From roughly June through October, seas can turn rough with little warning; check tour operator advisories before heading out on boat trips.
- Sunset on the west coast (Long Beach or the Sunset Sanato area) is most reliably clear during the dry season. See more things to do in our our full Phu Quoc travel guide.
