How reliable is Samui International Airport?
Month-by-month weather risk and connection guidance for Samui International Airport. We don’t yet have on-time performance history here — see why below.
Weather favorability
year-round climate
On-time performance data isn’t available for USM yet
Our historical on-time and cancellation record currently covers the US, UK, Brazil, and Australia, so we don’t score departure reliability at Samui International Airport yet. Weather climatology below comes from global airport observations and still applies.
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Weather by month
When the weather works for you at Na Thon (Ko Samui Island)
A calm-weather score (0–100) for each month from decades of airport observations — how often conditions disrupt flying, not temperature. Higher is calmer.
Calmest month
Calmest flying weather of the year · 100/100 favorability
Roughest month
Most disruptive — thunderstorms, low visibility & fog · 98/100 favorability
The read on USM
What the numbers say about flying through Samui International Airport
PlaneSane doesn't yet have on-time and cancellation history for Samui International Airport, so it isn't scored for departure reliability here — that record currently covers the US, UK, Brazil, and Australia. The weather and connection context below comes from separate global sources and still applies.
On weather, Na Thon (Ko Samui Island) is an unusually calm-weather airport year-round. January is the calmest stretch for flying, scoring 100 out of 100 for favorable conditions, while November is the most disruptive at 98, driven mainly by thunderstorms and low visibility & fog. The year is relatively steady, so no single month stands out as one to avoid on weather alone.
None of this guarantees your specific flight — it’s the backdrop. To turn it into a booking, score real flights to Na Thon (Ko Samui Island), read how we weigh it all in how the PlaneSane Score works, and brush up with how to pick a reliable flight and avoiding weather delays.
Common questions about USM
- What is the best month to fly from USM for good weather?
- January has the calmest flying weather at Samui International Airport. November is the most disruptive, mainly from thunderstorms and low visibility & fog.
Planning a trip through Na Thon (Ko Samui Island)?
Score real flights to and from USM on reliability, weather, and connection safety — not just price.