Iwaki Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Iwaki.
Climate overview of Iwaki
Iwaki, Fukushima, Japan, sees big temperature differences between seasons, with August peaking at 28°C (82°F) and January dropping to 8°C (46°F).
The city has a wet climate, receiving around 1606 mm (63 in) of rain/snowfall per year. Despite the high annual total, it has warm summers and cold winters. September is the wettest month.
Iwaki Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Iwaki - and find the best time to visit.
Monthly Temperature in Iwaki
Visitors to Iwaki can expect significant temperature changes throughout the year. On average, daytime temperatures range from a comfortable 28°C (82°F) in August to a chilly 8°C (46°F) in January.
Nighttime temperatures range from 22°C (72°F) in August to 1°C (34°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Iwaki
Iwaki is known for its substantial rain/snowfall, with annual precipitation reaching 1606 mm (63 in). The seasons in Iwaki bring significant changes in precipitation. The wettest month, September, receives heavy rainfall, with an average of 205 mm (8.1 in) of precipitation. This rainfall is distributed across 20 rainy days.
In contrast, the driest month, December, experiences much less rainfall, totaling 68 mm (2.7 in) over 12 rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Iwaki Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Iwaki
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May, June and August
- Warmest weather: July and August
- Fewest rainy days: January, November and December
- Seasonal pattern: Warm summers and cold winters
Frequently asked questions about the climate in Iwaki
What is the best time to visit Iwaki?
May, June and August typically offer the most optimal weather in Iwaki. In contrast, January, February, March and December tend to have less optimal conditions. Iwaki has warm summers and cold winters.
What temperatures can I expect in Iwaki?
Daytime highs range from 8°C (46°F) in January to 28°C (82°F) in August. Nighttime lows range from 1°C (34°F) to 22°C (72°F). Temperatures vary considerably through the year.
How much rain does Iwaki get?
Annual rainfall is around 1606 mm (63 in). September is the wettest month with 205 mm (8.1 in), while December is the driest with 68 mm (2.7 in).
Iwaki 3-Day Forecast
Iwaki 3-Day Forecast
Iwaki on the map
Iwaki is highlighted - select any city to see its climate.
Popular this month
Where to go in July - average daytime high across popular destinations.
Osaka
32°C (90°F) Tokyo30°C (86°F) Naha
30°C (86°F) Kyoto31°C (88°F) Hakone28°C (82°F) Hakuba26°C (79°F) Sapporo24°C (75°F) Niseko24°C (75°F) 
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