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.

Tuesday
15th Sep
21

19

1

7
Wednesday
16th Sep
22

19

1

5

5-day weather forecast updated at 04:03 on Thursday 10th 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 21°C, maximum UV of 7 (High) and 1 hour of bright sunshine. There are 30-40 mm of rainfall expected with 97% chance of some rain and little or no wind of 4 kph from the south-west.

21
°C maximum temperature
19
°C minimum temperature
isolated thunderstorms
1
hour of sunshine
7
UV index (High)
97
% chance of some rain
<40
mm of rainfall expected
0
no heat & humidity
4
kph wind from SW

Koya weather for Wednesday 16th September 2026

Expect isolated thunderstorms in Koya, Japan with a maximum temperature of 22°C, maximum UV of 5 (Moderate) and 1 hour of bright sunshine. There are 20-30 mm of rainfall expected with 100% chance of some rain and little or no wind of 3 kph from the north-east.