Weather in the Yaeyama Islands: A Complete Guide
The Yaeyama Islands (八重山諸島), including Ishigaki, Iriomote, Taketomi, Hateruma, and Yonaguni, lie at Japan’s southernmost edge. Surrounded by coral seas and covered in subtropical forest, they enjoy a warm, humid climate year-round. For travelers, understanding the weather in the Yaeyama Islands is essential for planning — from the sunny summers perfect for diving, to the quiet winters ideal for culture and food.
Year-Round Climate Overview
Subtropical rainforest climate (亜熱帯気候)
Average annual temperature: ~24°C
High humidity: nourishes lush jungle and rice fields
Seasons: Spring, Rainy (梅雨), Summer, Autumn, Winter
Summer in the Yaeyama Islands (June–September): Energy & Sunshine
Summer brings long days of sunshine, turquoise seas, and intense heat. Ocean visibility is at its best, making this the prime season for snorkeling and diving. However, it is also the most humid and the core of typhoon season (台風シーズン). It’s the most popular time of year, especially for travelers from Japan and Asia, so hotels and resorts fill up quickly.
Great for beach holidays, snorkeling, and diving
Day trips by boat to nearby islands
Evening barbecues or casual outdoor dining by the sea
Keep in mind it’s hot, humid, and busier — perfect if you enjoy lively atmospheres.
Average highs: 30–33°C
Humidity: >80%
Ocean temperature: 28–30°C
Clothing Tips for Summer in the Yaeyama Islands
Breathable, quick-dry clothing (linen, cotton, UV shirts)
Rash guards/swimwear for ocean activities
Hat, sunglasses, sunscreen essential
Sandals for beach, but shoes for jungle hikes
Winter in the Yaeyama Islands (December–February): Mild & Quiet.
Winter is mild compared to mainland Japan. While days may be cloudy, temperatures stay around 18–22°C. It is a good time for active and cultural trips.
Cycling and hiking in cooler air
Exploring local food and markets
Visiting artisan workshops and cultural sites
It’s not the best for swimming or lounging on the beach, but it’s perfect if you want a slower pace and fewer tourists.
Average lows: 16–18°C
Clothing Tips for Winter in the Yaeyama Islands
Long-sleeve shirts, light sweater/jacket
Jeans or light trousers
No heavy coat needed, but layers are helpful
Spring & Autumn (March, April, October, November): Comfortable & Balanced
These months are often considered the ideal time to visit Ishigaki. With pleasant temperatures, lower humidity, and fewer crowds, they offer a balance between comfort and activity.
Cherry blossom on Fukai Omotodake in Ishigaki
Spring in The Yaeyama Islands
Spring is one of the most balanced seasons: warm, dry, and comfortable. Hibiscus flowers bloom, and Ishigaki’s cherry blossoms (緋寒桜) appear earlier than in mainland Japan.
Average temperature: 22–26°C
Activities: hiking, festivals, early beach season
Autumn in The Yaeyama’s
By October, humidity drops, skies clear, and temperatures become more comfortable. Typhoon risks lessen, making this a favorite season for active travelers. Sunsets and starry skies are especially vivid.
Average temperature: 25–28°C
Weather: Mostly sunny, gentle breezes
Spring and Autumn activities in Ishigaki and The Yaeyama Islands
Nature walks and scenic hikes in comfortable weather
Cultural experiences, such as traditional crafts or music
Relaxed sightseeing without the summer heat
Clothing Tips for Spring/Autumn in the Yaeyama Islands
Spring (Mar–Apr):
Light shirts & shorts for daytime
Light sweater/jacket for evenings
Comfortable walking shoes (for hiking, cycling)
- Umbrella or light raincoat
For many travelers, these seasons combine the best of both worlds — good weather and a calmer atmosphere.
Rainy Season in the Yaeyama Islands (梅雨, May–June)
Rainy season (tsuyu) lasts from May to June. Expect short, heavy showers, often at night or early morning. While some days are wet, others clear into beautiful skies. This rainfall is vital — it supports Yaeyama’s rice paddies, mangroves, and coral reefs.
Average temperature: 26–28°C
Rainfall: ~200–250 mm monthly
Travel tip: mornings are often dry, so plan hikes early.
Clothing Tips for Rainy season in the Yaeyama Islands
Umbrella or compact rain poncho
Quick-dry shoes/sandals
Lightweight waterproof bag cover
Typhoon Season (台風, May–October)
Typhoons are part of island life. They can bring strong winds and heavy rain, especially from May to September.
What to expect: canceled flights, ferries, and temporary shop closures
How to prepare: follow JMA updates, allow flexibility in plans
Hotels: generally well prepared with supplies and safety protocols
Month-by-Month Weather in the Yaeyama Islands
| Month | Avg Temp (°C) | Rainfall (mm) | Notes |
|---|---|---|---|
| Jan | 18–21 | 130 | Mild, cloudy |
| Mar | 22–24 | 150 | Spring warmth |
| Jun | 27–28 | 230 | Rainy season peak |
| Aug | 30–32 | 260 | Hottest, typhoons |
| Nov | 23–25 | 156 | Clear, comfortable |
Practical Travel Tips
What to Pack:
Summer: sunscreen, light clothes, rash guards, hat and or umbrella against strong UV
Rainy season: umbrella, quick-dry shoes
Winter: light jacket, layers
Where to Check Weather:
Traveler’s Tip:
Download the NHK World Weather app for English alerts.
Frequently Asked Questions about Ishigaki & the Yaeyama Islands
Is Ishigaki safe during typhoon season?
Yes. Typhoons usually pass quickly, and hotels are well prepared. During peak intensity, you’ll need to stay indoors for safety, and shops or restaurants may temporarily close. Always check updates from the Japan Meteorological Agency.
When is the rainy season in Ishigaki?
The rainy season is typically in May and June, with short, heavy showers. It usually clears up quickly and leads into sunny summer weather.
Can you swim in Ishigaki in winter?
While the water stays relatively warm, winter months (December–February) are cooler and often cloudy. It’s less ideal for beach swimming but perfect for hiking, cycling, and cultural activities.
What is the best month to visit Ishigaki?
Many (international) travelers prefer March, April, October, and November for comfortable weather, fewer crowds, and a balance of sunshine and mild humidity.
How hot does Ishigaki get in summer?
From June to September, daytime temperatures often reach 30–33°C (86–91°F) with high humidity. It’s the best time for ocean activities but also the busiest season.
Do flights get canceled often because of typhoons?
Yes, flights can be canceled before, during, and after a typhoon. Japanese airlines usually offer free ticket changes or refunds, so it’s good to stay flexible.
With this guide, travelers can plan confidently — knowing when to expect sunshine, when typhoons might affect schedules, and how each season brings a different charm to the Yaeyama Islands.