Koh Samui, Thailand

Koh Samui, Thailand

July beach and weather guide

Based on 5 years of historical ERA5 climate data

Photo by Pauline Bernfeld on Unsplash

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July beach conditions — historical average

Excellent
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27.9°C Temp
30.7°C Sea temp
10.2 Rain days
7.4h Sunshine hrs
79.3% Humidity

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

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Trip type

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

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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.

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

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