Chase the autumn leaves in Japan
Japan is one of these cases which turns into a gold, yellow and orange fairy tale starting from September. And we can honestly say: We cannot imagine a more beautiful season to visit Japan.
Kosai Weather in September
Kosai in September averages 29°C (84°F) during the day and 22°C (72°F) at night. Keep in mind that quite a bit of rainfall is expected this month.
Rainfall in Kosai in September
You can expect rain on around 18 days based on historical patterns, with 256 mm (10 in) average for the month. Wet weather is a regular and significant part of this month. Frequent days of rain combined with high totals means proper waterproofs are worth packing.
Temperature in Kosai in September
Daytime temperatures in Kosai reach 29°C (84°F) in September, dropping to 22°C (72°F) at night. This kind of day-to-night contrast is typical for this time of year. With lows of 22°C (72°F), the nights are warm and generally comfortable.
Sunshine in Kosai in September
The city usually sees around 169 hours of sunlight, indicating a moderately sunny period.For Kosai itself, April and May generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Kosai Temperature in September
Min Temperature
22°C (72°F)
Max Temperature
29°C (84°F)
Chance of Rain
58%
Precipitation
256 mm (10 in)
Rainy days
18 days
Humidity
74% *
Sunshine
169 hours *
Percentage Sunshine
*
* Data from: Hamamatsu, Japan (18 KM, 11 Miles).
Kosai Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Kosai - and find the best time to visit.
Best Places in Japan in September
Find out more about the weather in Japan and which places have the best travel conditions in this month. See all of Japan in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Kosai in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Also bring a poncho, it will rain a lot! Waterproof everything you can. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.
What To Do in Kosai in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming7/10 -
Cycling7/10 -
Walking7/10 -
Camping6/10 -
Outdoor sports7/10
Kosai 3-Day Forecast
More climate data for Kosai
Temperature Rainfall Sunshine Humidity
See the full Kosai climate overview or explore weather in Japan.
Popular in September
Where to go in September - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Chase the autumn leaves in Japan
Walk the 88 temple circuit
We recommend walking the 88 temple circuit from April til October. Although June, July and August can be a bit wet, hot and humid.
The famous bamboo forests of Arashiyama
The famous bamboo forests of Arashiyama lie just outside the city center of Kyoto and is unique in the world. If you look at photos of this bamboo forest, it looks like you have landed in a fairy-tale world.
10 reasons why you should visit Japan in winter
Here are 10 reasons why you should plan a winter trip to Japan. During this period, popular sights are less busy and prices for flights and hotels much cheaper.