See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
06:17
Sunrise
18:28
Sunset
Moon
Waxing Crescent
11:20
Moonrise
21:01
Moonset
Daily Forecast
Wednesday
Thursday
Friday
Saturday
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Air Quality Data Available
Upgrade to access real-time air quality data for Koesan.
Resources
UV Index
Humidity
Weather in Koesan today, September 16, 2026
Sunshine leads the day in Koesan on September 16, 2026, with a patch of cloud building near 03:00. The broader outlook stays fair despite that temporary thickening. The morning looks comparatively open, with cloud near 35% around 03:00. Early outdoor plans have a better chance of staying dry and bright.
Temperatures climb from an overnight low near 14°C toward a daytime high of about 27°C. Relative humidity sits between 40% and 96%, reaching its peak around 06:00. A lighter breeze peaks around 21:00 near 4.8 km/h.
Expect a more open afternoon, with limited cloud around 33% by 23:00. Residual damp risk should be lower than earlier. Horizontal visibility holds close to 16.1 km. The sun rises at 06:17 and sets at 18:28, for a total of 12 hours 10 minutes of sunlight today.
In short, September 16, 2026 looks like a fine day in Koesan for being outside, peaking around 27°C.
Frequently asked questions about weather in Koesan
How warm does it get in Koesan?
The warmest month in Koesan is August, with average high temperatures of 30°C. The average temperature during this period is around 26°C.
How cold does it get in Koesan?
The coldest month in Koesan is January, with average low temperatures of -6°C. The average temperature during this period is around -2°C.
What is the wettest time of year in Koesan?
The wettest month in Koesan is July, with an average of 280mm of precipitation.
What is the driest time of year in Koesan?
The driest month in Koesan is January, with an average of 23mm of precipitation.
