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.

Monday
21st Sep
20

18

0

5
Tuesday
22nd Sep
21

14

5

7
Wednesday
23rd Sep
20

14

3

1
Thursday
24th Sep
22

16

5

6
Friday
25th Sep
22

16

2

7

5-day weather forecast updated at 04:03 on Sunday 20th 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 Monday 21st September 2026

Expect isolated thunderstorms in Koya, Japan with a maximum temperature of 20°C, maximum UV of 5 (Moderate) and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 86% chance of some rain and a gentle breeze of 13 kph from the north.

20
°C maximum temperature
18
°C minimum temperature
isolated thunderstorms
0
hours of sunshine
5
UV index (Moderate)
86
% chance of some rain
<10
mm of rainfall expected
20
°C wind chill
13
kph wind from N

Koya weather for Tuesday 22nd September 2026

Expect sunshine and showers in Koya, Japan with a maximum temperature of 21°C, maximum UV of 7 (High) and 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 20% chance of some rain and a gentle breeze of 14 kph from the north.

21
°C maximum temperature
14
°C minimum temperature
sunshine and showers
5
hours of sunshine
7
UV index (High)
20
% chance of some rain
<2
mm of rainfall expected
21
°C wind chill
14
kph wind from N

Koya weather for Wednesday 23rd September 2026

Expect mostly cloudy with light rain in Koya, Japan with a maximum temperature of 20°C, maximum UV of 1 (Low) and 3 hours of bright sunshine. There are 0-2 mm of rainfall expected with 56% chance of some rain and little or no wind of 4 kph from the south-east.

20
°C maximum temperature
14
°C minimum temperature
mostly cloudy with light rain
3
hours of sunshine
1
UV index (Low)
56
% chance of some rain
<2
mm of rainfall expected
20
°C wind chill
4
kph wind from SE

Koya weather for Thursday 24th September 2026

Expect broken clouds in Koya, Japan with a maximum temperature of 22°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 north.

22
°C maximum temperature
16
°C minimum temperature
broken clouds
5
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
5
kph wind from N

Koya weather for Friday 25th September 2026

Expect broken clouds in Koya, Japan with a maximum temperature of 22°C, maximum UV of 7 (High) and 2 hours of bright sunshine. There are 0 mm of rainfall expected and little or no wind of 4 kph from the south-east.