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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 54–68°F, 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 75–85°F, 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 69–60°F, 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 48–47°F, 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. 65.3°F / Annual rainfall: approx. 2118 mm / Summer humidity: 70%–80% / Rainiest month: June

Isahaya monthly average temperature and precipitation

Month
Air temperature (°F)
Precipitation (mm)
January
46°F
80.5
February
47.8°F
93.5
March
54.9°F
167.9
April
62.8°F
208.7
May
68.7°F
217.5
June
75.2°F
380.4
July
83.5°F
329.5
August
85.3°F
198.8
September
81.1°F
178.1
October
69.6°F
90.6
November
60.8°F
118
December
48.4°F
54.7

Isahaya weather for the next seven days

12/17
Wednesday
Patchy rain nearby
59.5°F/48.6°F
12/18
Thursday
Sunny
57.3°F/45.8°F
12/19
Friday
Sunny
60.8°F/46°F
12/20
Saturday
Patchy rain nearby
65.1°F/53°F
12/21
Sunday
Heavy rain
61.5°F/53.7°F
12/22
Monday
Patchy rain nearby
53.9°F/50.9°F
12/23
Tuesday
Sunny
56.2°F/49.7°F

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.