Weather in Koh Samui in May

May in Koh Samui brings a mix of warm temperatures and refreshing rains, creating a lush environment perfect for exploration. The days are hot and humid, with occasional rainfall that provides a welcome relief from the heat. Outdoor activities remain enjoyable, especially for those keen to explore the vibrant landscapes. However, carrying an umbrella or rain jacket is advisable due to sporadic showers. The overall weather is quite suitable for nature walks and sightseeing ventures.

May Climate Overview

• Average Temperature: 25°C to 32°C
• Rainfall: 150mm (approx.)
• Sunshine Hours: 7 hours per day
• Sea Temperature: 29°C
• Humidity: High, around 80%
• Wind Speed: Moderate, approx. 12 km/h

What to Expect in May

Daytime Conditions

During May, the daytime can feel hot and humid, with temperatures rising up to 32°C. The sun is frequently out, so sun protection is essential. Humidity levels are high, adding to the warm sensation, making it important to stay hydrated and seek shade during intense sun exposure.

Rainfall Patterns

Rain in May is scattered and typically short-lived, yet can be occasionally intense. This pattern contributes to the tropical greenery and helps cool down the warm days. While rain might alter plans temporarily, it generally does not dominate the weather outlook.

Evening Conditions

Evenings in Koh Samui offer a pleasant cool-down with a gentle breeze complementing the temperature drop to around 25°C. Humidity remains but is less oppressive, making outdoor dining and leisure activities quite comfortable.

Best Activities in Koh Samui in May

• Outdoor Activities: Ideal for hiking and exploring the island’s natural beauty, including markets and wildlife viewing.
• Seasonal Highlights: May marks a period of lush vegetation due to the rains, enhancing the island’s scenic vistas.
• Water-based or Nature-based Activities: Snorkelling and exploring waterfalls are highly recommended during this time.

What to Pack for May

• Light, breathable clothing suited for warm daytime and cooler nights
• Sun hat, sunglasses, and high SPF sunscreen for daytime protection
• Raincoat or umbrella to handle unexpected showers
• Comfortable footwear for walking or light hiking
• Reusable water bottle to stay hydrated