Koya weather live forecast

Today's maximum temperature in Koya is expected to be 21°C. Select a day from the live weather forecast for Koya, Japan for more weather parameters.

Wednesday
23rd Sep
21

15

4

5
Thursday
24th Sep
23

14

7

7
Friday
25th Sep
22

14

5

5
Saturday
26th Sep
19

16

1

1
Sunday
27th Sep
19

17

3

4

5-day weather forecast updated at 04:03 on Wednesday 23rd 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 Wednesday 23rd September 2026

Expect mostly cloudy with light rain in Koya, Japan with a maximum temperature of 21°C, maximum UV of 5 (Moderate) and 4 hours of bright sunshine. There are 0-2 mm of rainfall expected with 44% chance of some rain and little or no wind of 3 kph from the east.

21
°C maximum temperature
15
°C minimum temperature
mostly cloudy with light rain
4
hours of sunshine
5
UV index (Moderate)
44
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
3
kph wind from E

Koya weather for Thursday 24th September 2026

Expect broken clouds in Koya, Japan with a maximum temperature of 23°C, maximum UV of 7 (High) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 kph from the north-west.

23
°C maximum temperature
14
°C minimum temperature
broken clouds
7
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
23
°C wind chill
7
kph wind from NW

Koya weather for Friday 25th September 2026

Expect broken clouds in Koya, Japan with a maximum temperature of 22°C, maximum UV of 5 (Moderate) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and little or no wind of 3 kph from the north-west.

22
°C maximum temperature
14
°C minimum temperature
broken clouds
5
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
3
kph wind from NW

Koya weather for Saturday 26th September 2026

Expect mostly cloudy with rain in Koya, Japan with a maximum temperature of 19°C, maximum UV of 1 (Low) and 1 hour of bright sunshine. There are 5-10 mm of rainfall expected with 85% chance of some rain and little or no wind of 4 kph from the south.

19
°C maximum temperature
16
°C minimum temperature
mostly cloudy with rain
1
hour of sunshine
1
UV index (Low)
85
% chance of some rain
<10
mm of rainfall expected
19
°C wind chill
4
kph wind from S

Koya weather for Sunday 27th September 2026

Expect isolated thunderstorms in Koya, Japan with a maximum temperature of 19°C, maximum UV of 4 (Moderate) and 3 hours of bright sunshine. There are 10-20 mm of rainfall expected with 95% chance of some rain and little or no wind of 5 kph from the south.