Phuket’s rainy season—from May to October—brings cooler weather, lush greenery, and unfortunately, a rise in seasonal illnesses. With increased humidity, stagnant water, and unpredictable temperatures, the risk of infection and disease spreads quickly. Whether you’re a local or traveler, it’s important to know what to watch out for in 2025, and how to stay safe.
1. Dengue Fever
Why it spikes: Standing water from heavy rainfall is a breeding ground for Aedes mosquitoes, the main carriers of dengue.
Symptoms:
- High fever
- Severe headache
- Muscle and joint pain
- Skin rash
2025 Update:
New smart surveillance tools are being used by the Phuket health department to predict outbreaks and notify high-risk areas via mobile apps. Wear insect repellent and avoid peak mosquito hours (early morning and dusk).
2. Diarrhea & Foodborne Illnesses
Why it spikes: Street food and wet market items can spoil faster in high humidity, and floodwater often contaminates local water sources.
Symptoms:
- Stomach cramps
- Diarrhea or vomiting
- Dehydration
2025 Tip:
Many local clinics in Phuket now offer rapid stool tests and hydration stations. Stick to bottled or filtered water, and avoid raw or undercooked food.
3. Influenza
Why it spikes: Close contact indoors during storms and fluctuating temperatures weaken immunity and spread the flu virus.
Symptoms:
- Sudden fever
- Sore throat
- Muscle pain
- Fatigue
2025 Update:
Flu vaccines adapted for tropical strains are widely available at Phuket provincial hospitals and some tourist clinics. Wear masks in crowded areas during flu season.
4. Leptospirosis
Why it spikes: This bacterial infection spreads through water contaminated with infected animal urine, especially after floods.
Symptoms:
- High fever
- Chills
- Red eyes
- Muscle aches
- Sometimes jaundice
2025 Insight:
The Phuket municipality has launched awareness campaigns targeting flood-prone neighborhoods. Avoid walking in floodwater, and wear waterproof boots when possible.
5. Fungal Skin Infections
Why it spikes: Wet clothing and constant moisture can cause skin infections like athlete’s foot and ringworm.
Symptoms:
- Red, itchy patches
- Flaky or cracked skin
- Peeling between toes
2025 Tip : Dermatology clinics in Phuket recommend antifungal powders and airing your feet as part of rainy-season hygiene.
How to Stay Healthy During the Rainy Season (2025 Tips)
- Keep dry: Bring extra clothing and rain gear
- Stay informed: Use local health apps for outbreak alerts
- Visit clinics early: Don’t ignore symptoms
- Boost immunity: Eat well, rest, and consider seasonal supplements
Final Thoughts
Thailand’s rainy season doesn’t have to mean getting sick—especially if you know what to look out for. Stay alert, stay dry, and enjoy the beauty of monsoon season in Phuket while staying healthy in 2025.
