Mud festival in South Korea
In July, the peaceful seaside town of Boryeong turned into a chaos of mud for 9 days. We recommend putting this festival on your bucket list.
Siheung in January sees low temperatures, with highs around 3°C (37°F) and overnight lows of -5°C (23°F). It's the driest month of the year, with very little snow/rainfall to worry about.
January in Siheung has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.
Pick a month to see the average temperature, rainfall and sunshine in Siheung - and find the best time to visit.
51-year average (1976-2026)
Based on our historical records, temperatures in Siheung typically stay consistent throughout January, with daily highs averaging around 3°C (37°F). Nights are very cold, with lows typically ranging from -9°C (16°F) to -6°C (21°F).
51-year average (1976-2026)
Average daily rainfall for each day of the month based on long-term records.
Browse day-by-day weather records for Siheung spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
The extremes listed below come from historical weather data collected in Siheung from 1976 through 2025.
Find out more about the weather in South Korea and which places have the best travel conditions in this month. See all of South Korea in January →
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
Cold weather calls for smart layering in January. A thermal base layer makes a huge difference in staying warm. Add a wool sweater or fleece, then a wind-resistant outer jacket. Pack a light rain jacket or compact umbrella for occasional showers. Sunglasses could come in handy during the sunnier parts of your trip.
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Temperature Rainfall Sunshine Humidity
See the full Siheung climate overview or explore weather in South Korea.
Where to go in January - average daytime high across popular destinations.
Need travel inspiration? Check out our bucket list articles and be inspired.
Mud festival in South Korea
In July, the peaceful seaside town of Boryeong turned into a chaos of mud for 9 days. We recommend putting this festival on your bucket list.
10 Hidden gems in Asia you need to visit
Explore 10 hidden gems in Asia offering authentic experiences, from pristine beaches and remote islands to cultural treks and peaceful mountain villages.
Chase the autumn leaves in Japan
Japan is one of these cases which turns into a gold, yellow and orange fairy tale starting from September. And we can honestly say: We cannot imagine a more beautiful season to visit Japan.
The 10 Most Exquisite Beaches in the Philippines
Explore the top 10 breathtaking beaches in the Philippines, from serene Nacpan Beach to volcanic Camiguin Island, in our detailed guide.