Daejeon, South Korea — Weather in September 2026

Monthly climate averages for Daejeon, South Korea. Based on 10-year ERA5 reanalysis data.

Cfa Humid Subtropical
8.2 /10
Excellent

September is an excellent month in Daejeon

Climate Overview

Daejeon, South Korea in September has warm conditions, with highs averaging 26°C (79°F). Rain falls on about 10 days this month.

This month falls at the beginning of Autumn.

Daily highs in September gradually drop from around 28°C (82°F) at the start to 25°C (76°F) by month's end.

Rainfall is heaviest during the middle of the month, while the last third tends to be drier.

Wind speeds ease off through the month, from 14 km/h (9 mph) to 11 km/h (7 mph).

The warmest days tend to fall around the 2th, averaging 27.8°C (82°F).

Compared to August, this month is about 5°C cooler with 3 fewer rainy days. Temperatures begin dropping heading into October.

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Monthly September Averages

Temperature
26°C / 18°C
Feels Like
28°C / 20°C
Rain
10 days · 167 mm
Sunshine
7.8h / day
Humidity
78% — Humid
Wind
13 km/h
Wind Direction
E (86°)
Gusts
32 km/h
Daylight
12.4 h
Cloud Cover
63%
Clear Sky Days
2.5
UV Index
5.2 — High
Dew Point
18°C — Humid
Moon Phase
Waxing Crescent · 11%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

32°C 28°C 24°C 20°C 16°C 12°C 8°C 151015202530
High Low

Daily Precipitation

0 mm 3 mm 6 mm 9 mm 12 mm 151015202530
Rainfall

Daily Sunshine

0h 3h 6h 9h 12h 151015202530
Sunshine

Daily Wind Speed

0 4 8 12 16 20 151015202530
Wind Speed
Sun Position
Sunrise 06:12
Daylight 12.4h
Sunset 18:39

What to Expect

Daytime temperatures around 26°C (79°F) are ideal for full-day outdoor exploration.

Rain usually comes in shorter passing showers rather than all-day rain.

1 of the last 5 yearly records were warmer than this month's long-run average.

Compare Months

January
Poor
Temp
4°C / -4°C
Feels Like
-1°C / -8°C
Rain
5days (24 mm) Good
Sun
7.6h Good
Humidity
63% Muggy
UV
2.9 Moderate
Snow Days
6days
View Details
February
Poor
Temp
6°C / -2°C
Feels Like
2°C / -6°C
Rain
5days (36 mm) Good
Sun
8.3h Good
Humidity
61% Muggy
UV
3.5 Moderate
Snow Days
4days
View Details
March
Fair
Temp
13°C / 3°C
Feels Like
10°C / -1°C
Rain
8days (52 mm) Wet
Sun
8.9h Good
Humidity
64% Muggy
UV
5 Moderate
Snow Days
2days
View Details
April best
Good
Temp
19°C / 8°C
Feels Like
17°C / 6°C
Rain
7days (69 mm) Good
Sun
9.4h Good
Humidity
63% Muggy
UV
5.9 High
View Details
May best
Excellent
Temp
24°C / 13°C
Feels Like
24°C / 12°C
Rain
8days (85 mm) Wet
Sun
10h Excellent
Humidity
66% Muggy
UV
6.2 High
View Details
June best
Excellent
Temp
28°C / 19°C
Feels Like
30°C / 20°C
Rain
9days (125 mm) Wet
Sun
9.8h Good
Humidity
70% Muggy
UV
7 High
View Details
July
Wet
Temp
30°C / 23°C
Feels Like
34°C / 27°C
Rain
15days (240 mm) Wet
Sun
8.2h Good
Humidity
82% Humid
UV
6.4 High
View Details
August
Fair
Temp
31°C / 23°C
Feels Like
35°C / 27°C
Rain
13days (175 mm) Wet
Sun
9.1h Good
Humidity
79% Humid
UV
6.6 High
View Details
September best
Excellent
Temp
26°C / 18°C
Feels Like
28°C / 20°C
Rain
10days (167 mm) Wet
Sun
7.8h Good
Humidity
78% Humid
UV
5.2 High
View Details
October best
Good
Temp
20°C / 11°C
Feels Like
19°C / 10°C
Rain
7days (84 mm) Good
Sun
7.9h Good
Humidity
74% Muggy
UV
4.1 Moderate
View Details
November
Fair
Temp
13°C / 4°C
Feels Like
10°C / 1°C
Rain
5days (40 mm) Good
Sun
7.7h Good
Humidity
71% Muggy
UV
3.3 Moderate
Snow Days
1days
View Details
December
Poor
Temp
5°C / -2°C
Feels Like
1°C / -6°C
Rain
4days (29 mm) Good
Sun
7.4h Good
Humidity
67% Muggy
UV
2.6 Moderate
Snow Days
4days
View Details
Month Temp Feels Like Rain Sun Humidity UV Status
January 4°C / -4°C -1°C / -8°C 5days (24 mm) Good 7.6h Good 63% Muggy 2.9 Moderate Poor View Details
February 6°C / -2°C 2°C / -6°C 5days (36 mm) Good 8.3h Good 61% Muggy 3.5 Moderate Poor View Details
March 13°C / 3°C 10°C / -1°C 8days (52 mm) Wet 8.9h Good 64% Muggy 5 Moderate Fair View Details
April best 19°C / 8°C 17°C / 6°C 7days (69 mm) Good 9.4h Good 63% Muggy 5.9 High Good View Details
May best 24°C / 13°C 24°C / 12°C 8days (85 mm) Wet 10h Excellent 66% Muggy 6.2 High Excellent View Details
June best 28°C / 19°C 30°C / 20°C 9days (125 mm) Wet 9.8h Good 70% Muggy 7 High Excellent View Details
July 30°C / 23°C 34°C / 27°C 15days (240 mm) Wet 8.2h Good 82% Humid 6.4 High Wet View Details
August 31°C / 23°C 35°C / 27°C 13days (175 mm) Wet 9.1h Good 79% Humid 6.6 High Fair View Details
September best 26°C / 18°C 28°C / 20°C 10days (167 mm) Wet 7.8h Good 78% Humid 5.2 High Excellent View Details
October best 20°C / 11°C 19°C / 10°C 7days (84 mm) Good 7.9h Good 74% Muggy 4.1 Moderate Good View Details
November 13°C / 4°C 10°C / 1°C 5days (40 mm) Good 7.7h Good 71% Muggy 3.3 Moderate Fair View Details
December 5°C / -2°C 1°C / -6°C 4days (29 mm) Good 7.4h Good 67% Muggy 2.6 Moderate Poor View Details

What to Wear

Summer clothing like shorts, t-shirts, and sundresses will be comfortable. Bring a light cardigan for air-conditioned spaces.

A waterproof jacket or compact umbrella is recommended for occasional showers.

Packing List

UmbrellaWaterproof jacketBreathable clothingSunscreen (SPF 30+)Sun hatSunglassesComfortable walking shoes

Frequently Asked Questions

September is typically excellent for visiting Daejeon, with average highs of 26°C (79°F) and around 10 rainy days. Daejeon, South Korea in September has warm conditions, with highs averaging 26°C (79°F). Rain falls on about 10 days thi
Daejeon typically sees around 10 rainy days in September with 167 mm (6.6 in) of total rainfall. An umbrella should suffice.
Evenings in Daejeon during September are mild at 18°C (65°F). A light cardigan is usually enough.
With highs of 26°C (79°F) and lows of 18°C (65°F) in September, we recommend: Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. Comfortable walking shoes are essential.
Yes, September offers some of the best weather conditions in Daejeon with comfortable temperatures and lower chances of rain.
The average UV index in Daejeon during September is 5 (moderate). Sunscreen and sunglasses are recommended during midday hours.
Daejeon gets approximately 12 hours of daylight per day in September, with around 8 hours of sunshine.
Snow is uncommon in Daejeon during September based on 10-year climate averages.

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