Climate & Weather in Koh Phangan (2026)

Koh Phangan stays warm year-round; even 'cool' months average 28–29°C (84°F) daytime. No cold season.
Peak season (Dec–Mar) brings crowds and higher prices, especially around Full Moon Party dates and holidays.
Shoulder seasons (Apr–May, Sep) offer fewer tourists and lower prices, with sporadic rain and manageable heat.
Rainy season (Sep–Nov) is quieter and 30–70% cheaper, but typhoon-scale thunderstorms (particularly Oct–Nov) are intense and can disrupt plans.
Rain during monsoon typically comes in afternoon bursts; mornings are often clear. Sea swells can affect swimming.
Mosquitoes are worse during rainy months; bring repellent.
Sea temperature is pleasant year-round (28–30°C (86°F) / 82–86°F), ideal for swimming and water sports.

Tropical monsoon climate with warm temperatures year-round, minimal seasonal temperature variation, and a distinct rainy season. No snowfall.

Months: December to March
Characteristics: Dry, sunny, calm seas, lower humidity, best beach conditions
Rainfall Monthly Mm: 33

Months: May to November
Characteristics: Hot, humid, afternoon thunderstorms, higher rainfall, especially September to November (monsoon).
Rainfall Monthly Mm: 157

Ends: mid-December
Peaks: October–November
Starts: September
Characteristics: Tropical monsoon rains typically fall in short intense bursts, leaving sunshine in between. Water temperature remains warm (28–30°C (86°F) / 82–86°F).

AI-generated estimateData refreshed July 2026

These are the sources cited in this climate & weather research for this city. Individual figures may not each trace to one of them.

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Data last updated July 2026 · Verify anything important.