Cool
Average highs are around 20°C, so pack for cooler days.
October verdict
Mixed for holiday weather
Average highs are around 20°C, so pack for cooler days. Sunshine averages 6.6h per day, enough for a balanced month. Rainfall averages 49mm, which is relatively low for holiday planning.

Monthly averages
Temp
20°C
Rain
49mm
Sun
6.6h
Sea
20°C
Weather score
48
Mixed
Cool
Average highs are around 20°C, so pack for cooler days.
Drier
Rainfall averages 49mm, which is relatively low for holiday planning.
Some sun
Sunshine averages 6.6h per day, enough for a balanced month.
Cool sea
Sea temperatures average 20°C, so the water can feel cool.
Map
Compare Seoul, South Korea with nearby places by weather score, rain, sun, temperature, and swim conditions.
October20°C average high
October is close to Seoul's yearly temperature average, giving a typical read on daytime heat.
Warmest monthsMay to September
This stretch sets the upper range for average daytime heat.
October49mm average rain
October is one of Seoul's driest months, making outdoor days easier to plan than in wetter parts of the year.
Driest monthsJanuary to June and October to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
October6.6 hours average sun
October sits close to Seoul's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsApril to June
This stretch has the strongest sunshine in the monthly averages.
October20°C average sea
October sits in the warmer sea-temperature season, usually making swimming easier to enjoy.
Warmest seaJuly to October
Sea temperatures are usually near 20°C in this stretch, so swimming comfort is at its strongest.
October48 weather score
October sits close to Seoul's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsJune and September
These months have the strongest weather score in the monthly averages.
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