Planning a Trip to Seoul? Here's the Weather
See what weather to expect in Seoul, South Korea and plan your trip with confidence. Monthly averages from real historical weather data.
Seoul runs on seasonal extremes — a bitter, dry cold in January with lows around -7°C, and a drenching monsoon peak in July that dumps 315mm of rain. Sandwiched between those poles are stretches of genuinely pleasant weather that reward visitors who time their trip well. The city's indoor culture — from kimchi museums to sprawling underground shopping arcades — means even an off-season visit has shelter, but the best of Seoul really does belong outdoors.
Written by Leo Vicente, founder & engineer who loves to travel
·
17°C
Avg. high
8°C
Avg. low
1301mm
Yearly rainfall
5
Best months
Travel Window Score · 7.5/10
Seoul's best stretch runs April–May — around 8 rain days a month and daytime highs near 21°C, on a 10-year historical average (climatology tier).
Climatology · 10-YR AVG · How we forecast →
Try It with Real Forecasts
Get confidence scores, activity suggestions, and real-time forecasts for your exact travel dates — not just averages.
Start PlanningMonthly Temperature & Rainfall
2°
-7°
19mm
Jan
5°
-5°
26mm
Feb
12°
1°
41mm
Mar
18°
7°
64mm
Apr
23°
12°
112mm
May
27°
18°
127mm
Jun
29°
22°
315mm
Jul
29°
23°
279mm
Aug
25°
17°
154mm
Sep
18°
9°
85mm
Oct
11°
2°
51mm
Nov
3°
-6°
28mm
Dec
What Weather to Expect in Seoul
Seoul typically has the most favorable weather for travel during April, May, June, September, October, with comfortable temperatures and relatively low rainfall — ideal conditions for sightseeing and outdoor activities.
Best Time to Visit Seoul
April, May, June, September, October offer the most comfortable conditions for exploring the city, with highs ranging from 18°C in the shoulder months to 27°C in June — warm enough for palace gardens and street markets without the oppressive rainfall that follows. September in particular stays warm but sits outside the heaviest downpours, making it a strong choice for those who want lingering warmth without committing to full monsoon season.
The best time to visit Seoul is April, May, June, September, October, when daytime highs average around 22°C and rainfall stays low at roughly 108mm per month. These months offer the most comfortable conditions for sightseeing, outdoor activities, and exploring the city at a relaxed pace. April is typically the driest of these months, with only around 64mm of precipitation.
July is genuinely difficult, with 315mm of rain that can disrupt outdoor plans for days at a stretch.
Seoul Weather by Season
Spring
Spring (March–May) brings mild weather to Seoul, with highs averaging 18°C and lows around 7°C. The season is moderately wet, accumulating around 217mm total with roughly 7 rainy days per month.
Summer
Summer (June–August) brings warm weather to Seoul, with highs averaging 28°C and lows around 21°C. The season is quite wet, accumulating around 721mm total with roughly 14 rainy days per month.
Autumn
Autumn (September–November) brings mild weather to Seoul, with highs averaging 18°C and lows around 9°C. The season is moderately wet, accumulating around 290mm total with roughly 8 rainy days per month.
Winter
Winter (December–February) brings cold weather to Seoul, with highs averaging 3°C and lows around -6°C. The season is relatively dry, accumulating around 73mm total with roughly 4 rainy days per month.
Things to do in Seoul
Handpicked activities you can book now, matched to typical weather in Seoul.
Itineraries Featuring Seoul
Climate data is a 10-year historical average (2016–2025), averaged across a wide area rather than a single weather station. Temperatures in Celsius. How we forecast →