Koh Samui, Thailand
Before You Book
← All beach destinations · Search your dates
Ski resorts Beach holidays About

Koh Samui

July beach and weather guide

Based on 5 years of historical ERA5 climate data

Photo by Marius Kriz on Unsplash

Checking 5 years of weather data...

This can take a few seconds

July beach conditions — historical average

Excellent
See hotels in Koh Samui now 🏨 Compare on Booking.com 🏨
✈️ Find flights to Koh Samui
27.9°C Temp
30.7°C Sea temp
10.2 Rain days
7.4h Sunshine hrs
79.3% Humidity
80%

Reliable conditions

4 of 5 years were good

Year by year — mid July

2025 Excellent 29.9°C · 6 rainy days · 9.1h sun
2024 Good 27.2°C · 13 rainy days · 5.7h sun
2023 Excellent 27.4°C · 10 rainy days · 8.1h sun
2022 Good 26.9°C · 11 rainy days · 6.8h sun
2021 Excellent 28.1°C · 11 rainy days · 7.4h sun

Other months in Koh Samui

January February March July August September

Still deciding? See other popular spots nearby!

Bali Phuket Da Nang

🔍 Live comparison tool

Not sure Koh Samui's right? Compare it now

Add up to two more destinations below and see them side by side for your exact dates — takes 10 seconds.

Trip type

Each trip type is scored on what matters most for it — snow days for skiing, sea temp for beach, sunshine for sightseeing.

Dates
Destinations

About Koh Samui in July

Based on 5 years of ERA5 historical climate data, July in Koh Samui has historically been excellent for a beach holiday. Average temperatures of 27.9°C with sea temperatures around 30.7°C and 10.2 rainy days on average.

4 of the last 5 years had good beach conditions during this period. This data uses ERA5 reanalysis records — real historical measurements, not generalised averages.

Check your specific dates

See 5 years of data for your exact travel dates

Check conditions for your exact dates →