Ko Samui climate
Thailand
In Ko Samui, seasonality tends to show up in mornings/evenings and indoor-outdoor gaps more than in a single number.
In Ko Samui, seasonality tends to show up in mornings/evenings and indoor-outdoor gaps more than in a single number.
Climate facts
Jan · Feb · Mar · Apr
Avg low 24–26°C / high 30–33°C · Rainy days: 3–10 / 30–120 mm (varies by month)
May · Jun · Jul · Aug · Sep
Avg low 25–26°C / high 30–32°C · Rainy days: 10–20 / 90–220 mm
May · Jun · Jul · Aug · Sep
Avg low 25–26°C / high 30–32°C · Rainy days: 10–20 / 90–220 mm
Oct · Nov · Dec
Avg low 24–26°C / high 29–31°C · Rainy days: 15–25 / 180–450 mm (often peaking around Nov)
How it tends to feel for travel
In hotter periods, day-versus-night fatigue accumulates differently, changing how the climate feels.
When it tends to fit
- • Once you see the year-round pattern, it’s easier to judge whether a month fits your style.
- • If you revisit the city, separating “seasonal itineraries” can save a lot of planning time.
- • In humidity- or rain-driven cities, adjusting the indoor/outdoor ratio can change comfort a lot.
When it may not fit
- • If you rely only on averages, you may be surprised by variability (squalls, wind, indoor AC).
- • In monsoon-like periods, the more your itinerary depends on outdoor walking, the higher the risk.
Outfit notes
This connects climate patterns to packing—without over-interpreting.
- • 🌴 Baseline: Koh Samui is warm and humid most of the year. Breathable, sweat-friendly fabrics help. Comfort is often shaped by humidity and being wet (sweat/rain/sea).
- • 👙 Beach/swimming: Getting wet is common. Quick-dry gear helps, and staying damp indoors under strong AC can feel chilly.
- • 🌧️ Shower season (May–Sep): Short intense showers can soak you quickly. A water-safe pouch + spare tee can stabilize the day.
In the end, it often depends on one or two conditions you care about most.
Explore Ko Samui
These pages are connected so you can compare conditions and decide for yourself.