Koya weather live forecast

Today's maximum temperature in Koya is expected to be 20°C. Select a day from the live weather forecast for Koya, Japan for more weather parameters.

Thursday
17th Sep
20

17

3

7
Friday
18th Sep
24

16

6

8
Saturday
19th Sep
25

17

5

6
Sunday
20th Sep
23

18

2

6
Monday
21st Sep
21

15

0

6

5-day weather forecast updated at 04:03 on Thursday 17th September 2026 GMT

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The 5-day weather forecast for Japan (Koya) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Koya weather forecast by day

Below are the detailed weather forecasts for Koya for the next 5 days.

Koya weather for Thursday 17th September 2026

Expect isolated thunderstorms in Koya, Japan with a maximum temperature of 20°C, maximum UV of 7 (High) and 3 hours of bright sunshine. There are 2-5 mm of rainfall expected with 60% chance of some rain and little or no wind of 4 kph from the north-east.

20
°C maximum temperature
17
°C minimum temperature
isolated thunderstorms
3
hours of sunshine
7
UV index (High)
60
% chance of some rain
<5
mm of rainfall expected
20
°C wind chill
4
kph wind from NE

Koya weather for Friday 18th September 2026

Expect sunshine and showers in Koya, Japan with a maximum temperature of 24°C, maximum UV of 8 (Very High) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 17% chance of some rain and little or no wind of 5 kph from the south-east.

24
°C maximum temperature
16
°C minimum temperature
sunshine and showers
6
hours of sunshine
8
UV index (Very High)
17
% chance of some rain
<2
mm of rainfall expected
24
°C wind chill
5
kph wind from SE

Koya weather for Saturday 19th September 2026

Expect broken clouds in Koya, Japan with a maximum temperature of 25°C, maximum UV of 6 (High) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and little or no wind of 5 kph from the east.

25
°C maximum temperature
17
°C minimum temperature
broken clouds
5
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
25
°C wind chill
5
kph wind from E

Koya weather for Sunday 20th September 2026

Expect mostly cloudy with light rain in Koya, Japan with a maximum temperature of 23°C, maximum UV of 6 (High) and 2 hours of bright sunshine. There are 0-2 mm of rainfall expected with 42% chance of some rain and a light breeze of 10 kph from the north.

23
°C maximum temperature
18
°C minimum temperature
mostly cloudy with light rain
2
hours of sunshine
6
UV index (High)
42
% chance of some rain
<2
mm of rainfall expected
23
°C wind chill
10
kph wind from N

Koya weather for Monday 21st September 2026

Expect cloudy with some rain in Koya, Japan with a maximum temperature of 21°C, maximum UV of 6 (High) and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 56% chance of some rain and a light breeze of 12 kph from the north.