Daejeon is warmest in August, averaging 29° by day and 21° at night. The wettest month is July with 360 mm, and the year brings about 1372 mm in total.
Month by month
| Month | High | Low | Rain | Daylight | Good for |
|---|---|---|---|---|---|
| January | 3° | -8° | 31 mm | 9.8 h | Cool |
| February | 6° | -6° | 34 mm | 10.6 h | Cool |
| March | 13° | -1° | 56 mm | 11.7 h | Mild |
| April | 19° | 4° | 57 mm | 12.9 h | Sightseeing |
| May | 24° | 10° | 102 mm | 13.9 h | Sightseeing |
| June | 29° | 16° | 162 mm | 14.5 h | Mild |
| July | 29° | 21° | 360 mm | 14.2 h | Rainy season |
| August | 29° | 21° | 264 mm | 13.4 h | Rainy season |
| September | 25° | 15° | 180 mm | 12.2 h | Rainy season |
| October | 19° | 8° | 47 mm | 11.0 h | Sightseeing |
| November | 13° | 1° | 48 mm | 10.0 h | Mild |
| December | 4° | -6° | 31 mm | 9.5 h | Cool |
High and low are average daily maximum and minimum, rain is typical monthly total, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER — averages, not promises.
When to go
Beach weather: No month in Daejeon combines swimming warmth with dry skies.
Walking the city: April, May and October — highs of 19–24° and no more than 102 mm of rain a month.
Wet season: July, August and September — up to 360 mm in a single month.