Koga

Onga-gun, Fukuoka Prefecture, Japan

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Current Weather

25°

Partly Cloudy

Feels Like: 25°

Min: 21°

Max: 27°

The next few hours will be humid and mostly cloudy, with today reaching 27°C and dropping to 19°C. The coming days will be partly cloudy

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Hourly Forecast

24° 26° 26° 27° 27° 27° 27° 27° 26° 26° 25° 24° 23° 22° 22° 21° 21° 21° 20° 20° 20° 20° 19° 21°
48%
48%
54%
54%
54%
54%
54%
54%
8%
8am
9am
10am
11am
12pm
1pm
2pm
3pm
4pm
5pm
6pm
7pm
8pm
9pm
10pm
11pm
12am
1am
2am
3am
4am
5am
6am
7am
Today
Tomorrow

Daylight Hours

06:05

Sunrise

18:17

Sunset

12 hours 11 minutes of sunlight today

Moon

Waxing Crescent

09:58

Moonrise

20:22

Moonset

Daily Forecast

Tuesday

21°
27°

Wednesday

19°
28°

Thursday

20°
28°

Friday

21°
29°

Saturday

22°
30°

Sunday

21°
30°

Monday

23°
26°

Tuesday

21°
26°

Wednesday

19°
30°

Thursday

18°
30°

Air Quality Data Available

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UV Index

No protection needed
2 Low
Low Extreme

Humidity

77% Humid
Low High

Weather in Koga today, September 15, 2026

Expect unsettled, showery conditions in Koga on September 15, 2026 as rain moves through. The day opens on a wet note and needs flexible outdoor plans. Early hours look the most unsettled, with rain probability near 54% by 10:00. The thickest cloud arrives around 08:00, reaching about 55%.

Temperatures climb from an overnight low near 21°C toward a daytime high of about 27°C. Expect humidity between 66% and 91%, most humid near 23:00. Airflow remains manageable, reaching about 3.3 km/h around 15:00.

The second half of the day still looks unsettled, with rain probability around 54% by 12:00. Dense cloud near 56% at 23:00 keeps the feel grey. Horizontal visibility holds close to 16.1 km. Expect sunrise at 06:05, sunset at 18:17, and 12 hours 11 minutes of sunlight today overall.

The practical takeaway for Koga on September 15, 2026 is simple: plan for rain, keep layers handy, and work around a high of about 27°C.

Frequently asked questions about weather in Koga

How warm does it get in Koga?

The warmest month in Koga is August, with average high temperatures of 33°C. The average temperature during this period is around 29°C.

How cold does it get in Koga?

The coldest month in Koga is January, with average low temperatures of 3°C. The average temperature during this period is around 6°C.

What is the wettest time of year in Koga?

The wettest month in Koga is July, with an average of 243mm of precipitation.

What is the driest time of year in Koga?

The driest month in Koga is December, with an average of 54mm of precipitation.

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Metric (°C, km/h)