Climate in Seoul, South Korea

Seoul, South Korea has a humid subtropical climate. The annual average temperature is about 18.5°C, with around 1196 hours of sunshine; the national rainfall baseline is roughly 1300 mm across 145 rainy days a year. The warmest month is Jul (highs near 29.4°C) and the coldest is Jan (lows near 7.7°C). These are deterministic planning estimates, not a forecast or measured station data. Temperature and sunshine follow the city's latitude; rainfall and the climate zone come from a country-level baseline that every city in the country shares (refined by region in the United States, Canada and Australia), so they do not show local differences. Check current conditions with an official meteorological service before travel.

Data year 2025; last updated 2026-05-16.

Seoul is classified as Humid Subtropical. The classification combines the city’s own temperature range, which follows its latitude, with a rainfall pattern taken at country level for South Korea — so cities in the same country usually share a zone.

The rainfall baseline for South Korea is about 1300 mm a year over roughly 145 rainy days, with the wettest month Jul and the driest Jan. This figure is not specific to Seoul: every city in South Korea carries the same baseline, so it will not show the difference between, say, a dry inland city and a wet coastal one. Use an official meteorological service for local rainfall.

Seoul sees an estimated 1196 hours of sunshine a year, concentrated in the warmer months around Jul.

By temperature and rainfall, the most comfortable months in Seoul are Oct, Apr, Nov. Conditions vary year to year — verify with a current forecast before booking.

Seoul has a climate comfort score of 81/100, a very comfortable year-round climate by this measure. The score weights mild temperatures most, then rainfall balance, sunshine, low seasonality, and the absence of extreme winter cold or summer heat.

• Climate in Tokyo — Humid Subtropical, comfort 74/100
• Climate in Hong Kong — Tropical, comfort 53/100
• Climate in Singapore — Tropical, comfort 41/100