Weather in Kosai in September
Kosai, Japan averages a high of 27.1°C (80.8°F) and low of 20.9°C (69.6°F) in September, with 14 rain days and 8.8 hours of daily sunshine. Travel score: 72.5/100 (Good). The best time to visit Kosai is May.
High
27°C81°F
Low
21°C70°F
🌧️
14
rain days
☀️
8.8
hrs/day sunshine
💧
80%
humidity
73— Good
September in Kosai is warm and occasionally wet — pack an umbrella and enjoy indoor attractions too.
What are the average temperatures in Kosai?
How much does it rain in Kosai in September?
Kosai receives an average of 229.7mm of rainfall across 14 rainy days in September. The annual total is 1872.1mm.
What should I pack for Kosai in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 27°C
🧴
Sunscreen SPF 30+
9 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Traveling to Japan in September?
Don't let a public holiday surprise you — restaurants, shops, and attractions may be closed.
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Data based on 1994–2024 averages · Last updated: 2024-12-31