Koya weather in September 2026

Q: How hot is it in Koya in September?

Daytime temperatures usually reach 27°C in Koya in September with low heat and humidity, falling to 20°C at night.

Q: How sunny is it in Koya in September?

There are normally 4 hours of bright sunshine each day in Koya in September - that's 31% of daylight hours.

Q: How warm is the sea around Koya in September?

The average sea temperature around Koya in September is 25°C.

Q: Does it rain in Koya in September?

There are usually 19 days with some rain in Koya in September and the average monthly rainfall is 181mm.

Q: What is the chance of a typhoon in Koya in September?

On average 1.4 days in September in Koya are likely to be affected by the passage of one or more tropical storms.

Expect daytime maximum temperatures of 77°F in Koya, Japan in September based on long-term weather averages. There are 5 hours of sunshine per day on average with 18 days with some rainfall and typically 10.7 inches of rainfall in the month.

77
77°F max day temperature
5
5 hours of sunshine per day
18
18 days with some rainfall
64
64°F min night temperature
12
12 hours of daylight per day
0
No heat & humidity
10.7
10.7 inches of monthly rainfall
9
9 (Very High) UV index

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The September weather guide for Japan (Koya) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C) | Imperial (°F)

More about Japan

How hot is it in Koya in September?

Daytime temperatures usually reach 81°F in Koya in September with low heat and humidity, falling to 68°F at night.

How sunny is it in Koya in September?

There are normally 4 hours of bright sunshine each day in Koya in September - that's 31% of daylight hours.

How warm is the sea around Koya in September?

The average sea temperature around Koya in September is 77°F.

Does it rain in Koya in September?

There are usually 19 days with some rain in Koya in September and the average monthly rainfall is 7.1 inches.

What is the chance of a typhoon in Koya in September?

On average 1.4 days in September in Koya are likely to be affected by the passage of one or more tropical storms.

Koya September sunrise & sunset times

Browse the sunrise and sunset times for Koya in September 2026. Select a month to view Koya sunrise and sunset times for the next 12 months.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Date	Sunrise times	Sunset times
Tuesday, 1st September 2026	05:31	18:24
Tuesday, 15th September 2026	05:40	18:05
Wednesday, 30th September 2026	05:51	17:44

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Japan - quick facts
Flight time^✝	11.5 to 15 hours
Time difference	UK +9 hours
Language(s)	Japanese
Currency	Japanese Yen
Electricity	A + B plug (100V)
Driving side	Left
Why visit?	Culture Nature Nightlife
Tourist info	Japan National Tourism Organization