Koya weather live forecast

Today's maximum temperature in Koya is expected to be 27°C. Select a day from the live weather forecast for Koya, Japan for more weather parameters.

Tuesday
1st Sep
27

21

6

9
Wednesday
2nd Sep
27

20

6

9
Thursday
3rd Sep
26

20

4

4
Friday
4th Sep
23

19

0

4
Saturday
5th Sep
23

18

2

8

5-day weather forecast updated at 04:02 on Monday 31st August 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 1st September 2026

Expect isolated thunderstorms in Koya, Japan with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 9 (Very High) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 9% chance of some rain and little or no wind of 6 kph from the south-east.

27
°C maximum temperature
21
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
9
UV index (Very High)
9
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
6
kph wind from SE

Koya weather for Wednesday 2nd September 2026

Expect isolated thunderstorms in Koya, Japan with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 9 (Very High) and 6 hours of bright sunshine. There are 2-5 mm of rainfall expected with 69% chance of some rain and little or no wind of 4 kph from the south-east.

27
°C maximum temperature
20
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
9
UV index (Very High)
69
% chance of some rain
<5
mm of rainfall expected
L
low heat & humidity
4
kph wind from SE

Koya weather for Thursday 3rd September 2026

Expect isolated thunderstorms in Koya, Japan with a maximum temperature of 26°C, low levels of heat & humidity, maximum UV of 4 (Moderate) and 4 hours of bright sunshine. There are 5-10 mm of rainfall expected with 88% chance of some rain and little or no wind of 5 kph from the south-east.

26
°C maximum temperature
20
°C minimum temperature
isolated thunderstorms
4
hours of sunshine
4
UV index (Moderate)
88
% chance of some rain
<10
mm of rainfall expected
L
low heat & humidity
5
kph wind from SE

Koya weather for Friday 4th September 2026

Expect isolated thunderstorms in Koya, Japan with a maximum temperature of 23°C, maximum UV of 4 (Moderate) and no hours of bright sunshine. There are 50 mm or more of rainfall expected with 93% chance of some rain and little or no wind of 6 kph from the south.

23
°C maximum temperature
19
°C minimum temperature
isolated thunderstorms
0
hours of sunshine
4
UV index (Moderate)
93
% chance of some rain
>50
mm or more of rainfall expected
0
no heat & humidity
6
kph wind from S

Koya weather for Saturday 5th September 2026

Expect isolated thunderstorms in Koya, Japan with a maximum temperature of 23°C, maximum UV of 8 (Very High) and 2 hours of bright sunshine. There are 30-40 mm of rainfall expected with 70% chance of some rain and a light breeze of 7 kph from the north.