Koya weather live forecast

Today's maximum temperature in Koya is expected to be 22°C. Select a day from the live weather forecast for Koya, Japan for more weather parameters.

Tuesday
15th Sep
22

19

2

5
Wednesday
16th Sep
20

18

1

4
Thursday
17th Sep
22

17

1

4
Friday
18th Sep
24

16

7

6
Saturday
19th Sep
25

17

5

6

5-day weather forecast updated at 04:03 on Tuesday 15th 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 Tuesday 15th September 2026

Expect isolated thunderstorms in Koya, Japan with a maximum temperature of 22°C, maximum UV of 5 (Moderate) and 2 hours of bright sunshine. There are 2-5 mm of rainfall expected with 91% chance of some rain and little or no wind of 3 kph from the south-east.

22
°C maximum temperature
19
°C minimum temperature
isolated thunderstorms
2
hours of sunshine
5
UV index (Moderate)
91
% chance of some rain
<5
mm of rainfall expected
0
no heat & humidity
3
kph wind from SE

Koya weather for Wednesday 16th September 2026

Expect isolated thunderstorms in Koya, Japan with a maximum temperature of 20°C, maximum UV of 4 (Moderate) and 1 hour of bright sunshine. There are 20-30 mm of rainfall expected with 96% chance of some rain and little or no wind of 3 kph from the north.

20
°C maximum temperature
18
°C minimum temperature
isolated thunderstorms
1
hour of sunshine
4
UV index (Moderate)
96
% chance of some rain
<30
mm of rainfall expected
0
no heat & humidity
3
kph wind from N

Koya weather for Thursday 17th September 2026

Expect isolated thunderstorms in Koya, Japan with a maximum temperature of 22°C, maximum UV of 4 (Moderate) and 1 hour of bright sunshine. There are 2-5 mm of rainfall expected with 67% chance of some rain and little or no wind of 4 kph from the north-east.

22
°C maximum temperature
17
°C minimum temperature
isolated thunderstorms
1
hour of sunshine
4
UV index (Moderate)
67
% chance of some rain
<5
mm of rainfall expected
0
no heat & humidity
4
kph wind from NE

Koya weather for Friday 18th September 2026

Expect scattered clouds in Koya, Japan with a maximum temperature of 24°C, maximum UV of 6 (High) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and little or no wind of 5 kph from the south-east.

24
°C maximum temperature
16
°C minimum temperature
scattered clouds
7
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
24
°C wind chill
5
kph wind from SE

Koya weather for Saturday 19th September 2026

Expect mostly cloudy with light rain in Koya, Japan with a maximum temperature of 25°C, maximum UV of 6 (High) and 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 47% chance of some rain and little or no wind of 5 kph from the east.