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
21st May
20

17

1

UV5
Friday
22nd May
19

13

0

UV6
Saturday
23rd May
16

12

1

UV6
Sunday
24th May
19

13

0

UV6
Monday
25th May
24

14

7

UV10

5-day weather forecast updated at 04:02 on Wednesday 20th May 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 21st May 2026

Expect isolated thunderstorms in Koya, Japan with a maximum temperature of 20°C, maximum UV of 5 (Moderate) and 1 hour of bright sunshine. There are 10-20 mm of rainfall expected with 90% chance of some rain and a light breeze of 9 kph from the south-west.

20
°C maximum temperature
17
°C minimum temperature
isolated thunderstorms
1
hour of sunshine
UV5
UV index (Moderate)
90
% chance of some rain
<20
mm of rainfall expected
0
no heat & humidity
9
kph wind from SW

Koya weather for Friday 22nd May 2026

Expect isolated thunderstorms in Koya, Japan with a maximum temperature of 19°C, maximum UV of 6 (High) and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 66% chance of some rain and little or no wind of 6 kph from the north-west.

19
°C maximum temperature
13
°C minimum temperature
isolated thunderstorms
0
hours of sunshine
UV6
UV index (High)
66
% chance of some rain
<10
mm of rainfall expected
0
no heat & humidity
6
kph wind from NW

Koya weather for Saturday 23rd May 2026

Expect overcast skies in Koya, Japan with a maximum temperature of 16°C, maximum UV of 6 (High) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the south-east.

16
°C maximum temperature
12
°C minimum temperature
overcast skies
1
hour of sunshine
UV6
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
11
kph wind from SE

Koya weather for Sunday 24th May 2026

Expect isolated thunderstorms in Koya, Japan with a maximum temperature of 19°C, maximum UV of 6 (High) and no hours of bright sunshine. There are 2-5 mm of rainfall expected with 52% chance of some rain and a light breeze of 8 kph from the south-east.

19
°C maximum temperature
13
°C minimum temperature
isolated thunderstorms
0
hours of sunshine
UV6
UV index (High)
52
% chance of some rain
<5
mm of rainfall expected
0
no heat & humidity
8
kph wind from SE

Koya weather for Monday 25th May 2026

Expect broken clouds in Koya, Japan with a maximum temperature of 24°C, maximum UV of 10 (Very High) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and little or no wind of 6 kph from the south-east.