Weather in Daejeon

On this site the months that score closest to a 22°C day, lighter rain, and moderate humidity are June, July, and September. Daejeon is in South Korea at 36.3°N. The 2001–2020 NASA POWER daily record describes a continental climate with a wide temperature swing.

August is the warmest month (average 24.8°C, high 28.8°C) and January is the coolest (average -3.3°C, low -7.9°C). Rain is wet season runs from June to September, inside an annual total of 1225 mm. The wettest month is July at 316 mm; the driest is January at 24 mm.

Hot and cool months in Daejeon

The heat peaks in August, when the typical afternoon is 28.8°C. The opposite pole is January, when mornings average -7.9°C.

Mean high across all twelve months is 16.7°C and mean low is 6.2°C. These are 20-year grid averages, so a city station can read a few degrees warmer or cooler.

When Daejeon gets wet

The wet season in Daejeon starts in June and ends in September (June, July, August, and September). July is the core of it at 316 mm. January is the other extreme, with 24 mm.

A rainy day here is a day with at least 1 mm in the NASA POWER series. July averages 18 such days; January averages 4.

Distinctive months in Daejeon

The year bottoms out in January. Plan for -7.9°C at night and 1.3°C in the afternoon. February: 4.4°C high, -5.6°C low, 34 mm rain, 76% humidity. In March, Daejeon averages 10.4°C by day and -1.7°C at night, with 46 mm of rain. April brings 81 mm and 8 rainy days; temperatures run from 4.1°C to 17.4°C. May stands apart from the months beside it: 23.5°C / 10.3°C and 80 mm. The wet season opens in June. Expect 134 mm and 10 rainy days, with nights around 16.0°C.

July is the wettest month — 316 mm and 18 rainy days, with 84% humidity. Peak heat arrives in August: 28.8°C by day, 20.8°C at night, and 84% humidity. September closes the wet season: 134 mm over 10 rainy days, then the calendar dries. October stands apart from the months beside it: 18.8°C / 7.8°C and 54 mm. November brings 41 mm and 6 rainy days; temperatures run from 1.0°C to 11.2°C. In December, Daejeon averages 3.2°C by day and -5.6°C at night, with 26 mm of rain.

Best months to visit Daejeon

The three months with the highest comfort score are June, July, and September: June (22.0°C average, 134 mm, 71% humidity); July (24.4°C average, 316 mm, 84% humidity); September (19.8°C average, 134 mm, 82% humidity). They fall in calendar order. The score rewards averages near 22°C, lower rainfall, and humidity near 60%. It is a climate score, not a festival or price calendar.

If you want the wet season itself — fewer crowds, greener landscape, heavier rain — aim at June–September instead of the score.

How Daejeon compares inside South Korea

Daegu is about 121 km away: Daejeon is about as warm as Daegu at the hot peak and a similar annual rainfall (1201 mm in Daegu). Daegu’s wettest month is July (264 mm) versus July here.

Gwangju is about 139 km away: Daejeon is 0.5°C cooler than Gwangju in its hottest month and 156 mm drier over the year than Gwangju. Gwangju’s wettest month is July (290 mm) versus July here.

Seoul is about 140 km away: Daejeon is about as warm as Seoul at the hot peak and a similar annual rainfall (1240 mm in Seoul). Seoul’s wettest month is July (361 mm) versus July here.