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Iwaki

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Iwaki Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Iwaki year round climate

  • Spring (March–May): 8.6–17.1°C on average, mild climate but with relatively high rainfall, especially in April and May. Common activities: Hiking, flower viewing. Recommended clothing: Light jacket, comfortable long-sleeved clothing.
  • Summer (June–August): 21.0–26.6°C on average, hot and humid, but with relatively low rainfall. Common activities: Swimming at the beach, outdoor activities. Recommended clothing: Light and breathable short-sleeved clothing, shorts, sun hat.
  • Autumn (September–November): 17.9–24.3°C on average, pleasant climate, but September has the most rainfall. Common activities: Autumn leaves viewing, outdoor excursions. Recommended clothing: Comfortable long-sleeved clothing, light jacket.
  • Winter (December–February): 4.5–6.8°C on average, cold and dry, with low rainfall. Common activities: Hot spring bathing, indoor activities. Recommended clothing: Warm jacket, sweater, scarf, gloves.

Iwaki climatological average

Annual average temperature: approx. 15°C / Annual rainfall: approx. 1431 mm / Summer humidity: 70%–80% / Rainiest month: September

Iwaki monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
4.5°C
52
February
5.1°C
45.5
March
8.6°C
142.3
April
13.8°C
123
May
17.1°C
172.1
June
21°C
155.8
July
25.6°C
114.5
August
26.6°C
101.8
September
24.3°C
265.5
October
17.9°C
120.4
November
12.9°C
106.3
December
6.8°C
32.5

Iwaki weather for the next seven days

4/10
Friday
Moderate rain
16.2°C/12.8°C
4/11
Saturday
Patchy rain nearby
19.1°C/9.9°C
4/12
Sunday
Sunny
19°C/9.7°C
4/13
Monday
Overcast
20.7°C/10.5°C
4/14
Tuesday
Partly Cloudy
15.7°C/10°C
4/15
Wednesday
Partly Cloudy
13.9°C/9.9°C
4/16
Thursday
Sunny
12.6°C/7°C

Iwaki Frequently Asked Questions and Useful Information for Travel

What is Iwaki famous for?

Iwaki is renowned for its paleontological discoveries, most notably the Futabasaurus dinosaur. Visitors can delve into the region's mining history at the Horuru: Iwaki Coal and Fossil Museum.

What does Iwaki mean in Japanese?

In Japanese, Iwaki can be written as 岩井 meaning 'stone well' or 岩居 meaning 'resides in a stony place', both common placenames. The former is found as a surname in western Japan, while the latter is more prevalent in eastern Japan.

Does it snow in Iwaki?

Yes, Iwaki experiences snowfall, transforming the landscape into a snow-covered, white expanse. This winter beauty gradually melts away with the bright spring sunlight, revealing speckled patterns on the mountain surfaces.

What kind of food is Iwaki known for?

A savory summer treat in Iwaki is sea urchin, often cooked in its shell and locally called 'gazze'. Fishermen retrieve purple sea urchins from the sea, clean them, stack them in Sakhalin surf clam shells, and carefully roast them over charcoal on small stones.

What can I learn at the Horuru: Iwaki Coal and Fossil Museum?

The Horuru: Iwaki Coal and Fossil Museum offers insights into Iwaki's rich mining history and its significant fossil discoveries, including the famous Futabasaurus dinosaur.