Koh Samui vs Penang

Based on sunshine hours, rain days, comfortable temperatures, and humidity levels, Koh Samui edges ahead as the better destination in July. Koh Samui offers 10 hours of daily sunshine with only 18 rain days, while Penang sees 10 sunshine hours and 21 rain days.

Koh Samui sits in the comfortable travel range at 27°C. Penang runs hot at 30°C.

For travelers who prioritize dry weather, Koh Samui is the stronger choice in July.

Koh Samui reaches an average high of 27°C (81°F) and drops to 24°C (75°F) at night during July. The daily temperature range is 3°C, meaning relatively stable temperatures from day to night.

Penang averages 30°C (86°F) for the high and 25°C (77°F) for the low, with a daily range of 5°C. The 3°C difference is noticeable but not dramatic.

Both cities are in the Northern Hemisphere, so they share the same seasonal pattern in July.

Koh Samui receives approximately 82 mm of rainfall across 18 rain days during July. Rain is frequent, so waterproof gear is essential.

Penang sees 157 mm over 21 rain days. That makes Koh Samui the drier option by 3 rain days and 75 mm of total precipitation.

Both cities share similar humidity levels at 82%.