Hachijojima Weather in September

In Hachijojima, September brings high daytime temperatures around 28°C (82°F), with nights cooling to 25°C (77°F). This month falls within the rainy season, so expect frequent rainfall.

Rainfall in Hachijojima in September

Hachijojima is in the rainy season in September, with rain on around 18 days and an average of 243 mm (9.6 in). The rainy season here brings regular, substantial showers. It's worth being prepared for rain on most days you're out.

Temperature in Hachijojima in September

If you're visiting Hachijojima in September, expect highs of 28°C (82°F) and overnight lows around 25°C (77°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. At 25°C (77°F) overnight, it stays warm after dark. Light, breathable clothing and good airflow in your room make a noticeable difference.

Sunshine in Hachijojima in September

The area enjoys a balanced 142 hours of sunlight, ensuring it's neither too rainy nor too sunny.

Wind Speed in Hachijojima in September

September has wind speeds averaging 5 m/s (10 knots). You can expect gentle to moderate winds that move small trees and make flags wave steadily on typical days. Conditions typically range from light breezes to moderate winds.

Average water temperature in September

With water at 26°C (79°F), you can expect warm, pleasant conditions for any water activity. There's no adjustment period — it feels comfortable straight away.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. April, May, July and August typically offer the best weather for Hachijojima.

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For a detailed overview over the year and the best time to visit Japan, check out our Hachijojima's climate page.

Hachijojima Temperature in September

Min Temperature 25°C (77°F)  

Max Temperature 28°C (82°F)  

Water Temperature 26°C (79°F)  

Chance of Rain 61%  

Precipitation 243 mm (9.6 in)  

Rainy days 18 days  

Humidity 86%  

Windspeed 5 m/s (10 knots)  

Sunshine 142 hours  

Percentage Sunshine 40%  

What to Wear in Hachijojima in September

Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! The water temperature sits at about 26°C (79°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. Sunglasses could come in handy during the sunnier parts of your trip.

What To Do in Hachijojima in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

7/10

Cycling

7/10

Walking

7/10

Camping

7/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Japan, check out our Hachijojima's climate page.

More climate data for Hachijojima

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Hachijojima climate overview or explore weather in Japan.