Winter (December to February)
Sharp cold with highs around 4° and lows near -5°, a few showers (4 rainy days per month on average). Not an ideal time for a leisure trip.
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When to visit South Korea
Climate · 10-year averages
When to visit Cheonan?
Best time to visit Cheonan: from April to Juneandfrom September to October. Month-by-month temperatures, rainfall and sunshine, based on ten years of weather data.
Best time to go
From April to Juneandfrom September to October
Hottest month
August · 30°
Coldest month
January · -5°
Wettest month
August · 267 mm
Climate month by month
Bars: monthly rainfall. Lines: average highs and lows. Month color: our travel comfort index.
- JanuaryÀ éviter
3° / -5°
- Rain
- 21 mm · 4 d
- Sunshine
- 7.5 h/day
- Humidity
- 63%
- FebruaryÀ éviter
5° / -4°
- Rain
- 27 mm · 4 d
- Sunshine
- 8.5 h/day
- Humidity
- 63%
- MarchCorrect
12° / 1°
- Rain
- 44 mm · 6 d
- Sunshine
- 9.2 h/day
- Humidity
- 65%
- AprilIdéal
19° / 6°
- Rain
- 71 mm · 7 d
- Sunshine
- 9.4 h/day
- Humidity
- 62%
- MayIdéal
24° / 12°
- Rain
- 89 mm · 8 d
- Sunshine
- 10.1 h/day
- Humidity
- 63%
- JuneIdéal
28° / 17°
- Rain
- 93 mm · 10 d
- Sunshine
- 9.9 h/day
- Humidity
- 70%
- JulyMitigé
30° / 22°
- Rain
- 235 mm · 17 d
- Sunshine
- 8.5 h/day
- Humidity
- 80%
- AugustCorrect
30° / 22°
- Rain
- 267 mm · 15 d
- Sunshine
- 8.7 h/day
- Humidity
- 79%
- SeptemberIdéal
25° / 17°
- Rain
- 145 mm · 9 d
- Sunshine
- 8.4 h/day
- Humidity
- 77%
- OctoberIdéal
19° / 10°
- Rain
- 71 mm · 5 d
- Sunshine
- 8.5 h/day
- Humidity
- 72%
- NovemberCorrect
12° / 3°
- Rain
- 56 mm · 7 d
- Sunshine
- 7.2 h/day
- Humidity
- 72%
- DecemberÀ éviter
4° / -4°
- Rain
- 30 mm · 5 d
- Sunshine
- 7.1 h/day
- Humidity
- 67%
2014–2023 averages from the ERA5 reanalysis (Copernicus) via Open-Meteo. A day counts as a “rainy day” from 1 mm of rain.
Our take, season by season
Spring (March to May)
Mild weather with highs around 18° and lows near 6°, a few showers (7 rainy days per month on average). It's a great time to go.
Summer (June to August)
Pleasant warmth with highs around 29° and lows near 20°, regular rain (14 rainy days per month on average). A decent time to go, as long as you're willing to make a few compromises.
Fall (September to November)
Mild weather with highs around 19° and lows near 10°, a few showers (7 rainy days per month on average). It's a great time to go.
Frequently asked questions
- When is the best time to visit Cheonan?
- The best time to visit Cheonan is from April to Juneandfrom September to October, with highs between 19° and 28° and few rainy days.
- What is the hottest month in Cheonan?
- August is the hottest month, with an average high of 30 °C.
- What is the coldest month in Cheonan?
- January is the coldest month, with an average low of -5 °C.
- When does it rain the most in Cheonan?
- August is the wettest month (267 mm, about 15 rainy days). The driest is January (21 mm).
- When should you avoid Cheonan?
- The least favorable months are from December to February: too hot, too cold, or too rainy to make the most of your trip.
When to visit other cities · South Korea
The capital and the country's other major cities.
More practical info: South Korea
- Country guideEverything about a country on one page: time, weather, currency, plugs, emergency numbers, tipping, visas.
- WeatherTemperature, rain, wind, and UV index for every capital.
- Air qualityPollution, fine particulate matter, and ozone, with a 36-hour forecast.
- Local timeLive clock, time zone, and time difference from where you are.
- Public holidaysEvery public holiday of the year, plus the next one coming up.
- Power OutletsPlug type, voltage, and whether your devices need an adapter.
- Driving SideWhich side of the road to drive on and which license you need before renting a car.
- Emergency NumbersPolice, ambulance, and fire department numbers for every country.
- TippingHow much to tip at restaurants, in taxis, and at hotels.
- Dialing CodesHow to call a country from abroad.
- Salat TimesFajr, Dhuhr, Asr, Maghrib, Isha, and Imsak times in every capital.
- QiblaReal-time compass pointing to the Kaaba from your GPS location.
- Visa requirements from FranceDo you need a visa for South Korea?