Isahaya Weather in September

September in Isahaya sees daytime temperatures around 28°C (82°F) and lows of 23°C (73°F) at night. Being part of the rainy season, heavy rainfall is a regular part of the day, so pack accordingly.

Rainfall in Isahaya in September

As part of the rainy season, Isahaya sees around 17 days of rain in September, with an average of 211 mm (8.3 in). Rainfall this month is frequent and tends to be fairly heavy when it does fall. Packing waterproofs is a good idea.

Temperature in Isahaya in September

Isahaya in September gets highs of 28°C (82°F) during the day and drops to 23°C (73°F) at night. This kind of day-to-night contrast is typical for this time of year. With lows of 23°C (73°F), the nights are warm and generally comfortable.

Sunshine in Isahaya in September

The area enjoys a balanced 173 hours of sunlight, ensuring it's neither too rainy nor too sunny.

Wind Speed in Isahaya in September

Wind speeds average 1 m/s (2 knots) during September. At this speed, you'll experience mostly light air movement that's just barely noticeable. As an average, some days will be completely calm while others have gentle breezes you can feel on your skin.

Average water temperature in September

The water temperature is 26°C (79°F), which most people find very comfortable. A good month for swimming and water sports.

Should you favor a climate that's both dry and comfortably warm, October typically offers the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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 Isahaya's climate page.

Isahaya Temperature in September

Min Temperature 23°C (73°F)  

Max Temperature 28°C (82°F)  

Water Temperature 26°C (79°F) *  

Chance of Rain 57%  

Precipitation 211 mm (8.3 in)  

Rainy days 17 days  

Humidity 74% *  

Windspeed 1 m/s (2 knots) *  

Sunshine 173 hours *  

Percentage Sunshine 46% *  

* Data from: Nagasaki, Japan (23 KM, 14 Miles).

What to Wear in Isahaya in September

Warm but pleasant conditions in Isahaya in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. With water temperatures around 26°C (79°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. Sunglasses could come in handy during the sunnier parts of your trip.

What To Do in Isahaya 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

6/10

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 Isahaya's climate page.

More climate data for Isahaya

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

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