Weather in Iwamizawa in September
Iwamizawa, Japan averages a high of 21.2°C (70.2°F) and low of 13.4°C (56.1°F) in September, with 12 rain days and 8.5 hours of daily sunshine. Travel score: 71/100 (Good). The best time to visit Iwamizawa is July.
High
21°C70°F
Low
13°C56°F
🌧️
12
rain days
☀️
8.5
hrs/day sunshine
💧
80%
humidity
71— Good
September in Iwamizawa is mild and occasionally wet — pack an umbrella and enjoy indoor attractions too.
What are the average temperatures in Iwamizawa?
How much does it rain in Iwamizawa in September?
Iwamizawa receives an average of 128.3mm of rainfall across 12 rainy days in September. The annual total is 1066.1mm.
What should I pack for Iwamizawa in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
🧥
Mix of light and warm layers
Mild temperatures around 21°C
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Sunscreen SPF 30+
9 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Recommended
🧥
Light rain jacket
Some rainy days expected (12 days)
☔
Umbrella
Be prepared for occasional showers
🎉Visiting Japan in September?
Don't miss any public holidays — check before you book!
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Data based on 1994–2024 averages · Last updated: 2024-12-31