Siheung Weather & Climate: Best Time to Visit

The climate in Siheung is known for significant temperature differences throughout the year, making the weather dynamic. On average, daytime temperatures range from a comfortable 29°C (84°F) in August to a chilly 3°C (37°F) in January.

Nighttime temperatures range from 23°C (73°F) in August to -5°C (23°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Siheung has a notably wet climate with abundant precipitation, recording 1227 mm (48 in) of rain/snowfall per year. The seasons in Siheung bring significant changes in precipitation. The wettest month, July, receives heavy rainfall, with an average of 301 mm (12 in) of precipitation. This rainfall is distributed across 16 rainy days.

In contrast, the driest month, January, experiences much less snow/rainfall, totaling 23 mm (0.9 in) over 8 snowy/rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Siheung Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Siheung enjoys sunny spells year-round. May sees up to 8.1 hours of daily sunshine, perfect for a sunny trip. July, the least sunny month, still offers a generous 5.4 hours of sun despite this cloudier time of the year.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

The relative humidity is high throughout the year in Siheung.

The city experiences its highest humidity in July, reaching 82%. In January, the humidity drops to its lowest level at 60%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year