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Isahaya

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Isahaya Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Isahaya year round climate

  • Spring (March–May): Average 12.7–20.4°C, mild climate, but with relatively high rainfall, especially in April. Common activities: Spring outings, flower viewing (such as cherry blossoms, but be mindful of rainy days). Recommended clothing: Light jacket, long-sleeved shirt, rain gear is essential.
  • Summer (June–August): Average 24.0–29.6°C, hot and humid, frequent rainfall, with the most rainfall in June. Common activities: Summer resorts, beach activities (be mindful of weather changes). Recommended clothing: Light and breathable clothing, sun hat, rain gear.
  • Autumn (September–November): Average 20.9–16.0°C, comfortable and pleasant climate, rainfall gradually decreases. Common activities: Hiking, viewing autumn leaves (depending on actual leaf color change). Recommended clothing: Comfortable jacket, long-sleeved shirt.
  • Winter (December–February): Average 9.1–8.8°C, cold and dry, less rainfall. Common activities: Hot springs, indoor activities. Recommended clothing: Warm jacket, sweater, scarf and gloves.

Isahaya climatological average

Annual average temperature: approx. 18.5°C / Annual rainfall: approx. 2118 mm / Summer humidity: 70%–80% / Rainiest month: June

Isahaya monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
7.8°C
80.5
February
8.8°C
93.5
March
12.7°C
167.9
April
17.1°C
208.7
May
20.4°C
217.5
June
24°C
380.4
July
28.6°C
329.5
August
29.6°C
198.8
September
27.3°C
178.1
October
20.9°C
90.6
November
16°C
118
December
9.1°C
54.7

Isahaya weather for the next seven days

9/22
Tuesday
Sunny
28°C/21°C
9/23
Wednesday
Sunny
27.6°C/20.3°C
9/24
Thursday
Overcast
28.9°C/20.9°C
9/25
Friday
Overcast
28°C/21°C
9/26
Saturday
Light rain shower
26.1°C/21.4°C
9/27
Sunday
Light rain shower
23.6°C/21.6°C
9/28
Monday
Light rain shower
23.7°C/21.2°C

Isahaya Frequently Asked Questions and Useful Information for Travel

What kind of city is Isahaya?

Isahaya is a vibrant local administrative and cultural center with excellent road and rail connections, making it a convenient base for exploring the region. Its economy thrives on the food-processing industry and attracts tourists interested in the natural beauty of Unzen-Amakusa National Park and Tara-dake Prefectural Park.

Does Isahaya have any festivals?

Yes, Isahaya hosts the "Nonnoko Isahaya Festival," its largest citizen-participation event. Held annually in mid-September, this popular festival draws around 100,000 visitors and offers a lively glimpse into local culture and community spirit.

What is the history of Isahaya?

Isahaya's history stretches back to ancient Hizen Province, with its name appearing in documents from the Kamakura period. During the Sengoku period, it was under the control of a cadet branch of the Ryūzōji clan, and later became part of the Saga Domain during the Edo Period.

What are the main attractions in Isahaya?

Isahaya serves as a gateway to natural wonders like the Unzen-Amakusa National Park and the serene Tara-dake Prefectural Park. Visitors can also explore the city's local administrative and cultural offerings, enjoying its strategic location and developing economy.

How is Isahaya connected to other areas?

Isahaya boasts good road and rail connections, particularly to Nagasaki, which is approximately 16 kilometers (10 miles) to the southwest. This connectivity makes it an accessible destination for travelers looking to explore the wider Nagasaki Prefecture.