Weather in Busan in October

Prime time. If you get to pick your dates, October is the one. Highs average 20.6 °C, lows 13.8 °C, and rain falls on 5 days — nothing in the month is working against you.

October is the highest-scoring month of the twelve. The nearest rival is May, and the month at the other end of the year is January.

Rain falls on only 5 days, so an itinerary with no wet-weather fallback is a reasonable risk. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average October reaches 30 °C. Across the twenty years measured, the hottest October day reached 27.3 °C and the coldest night fell to 3.3 °C, and the wettest single day dropped 93 mm — roughly 124% of the month's rain in one day.

October is moderately variable: 9 mm in the driest year against 180 mm in the wettest, around an average of 75 mm. Roughly two Octobers in three land near that average, and the third does something else entirely.

Wind is light at 12.9 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 76%, high enough to notice on the warm days without dominating them.

How October sits in the year

The month is on the way down: 4.5 °C cooler than September, with November dropping another 5.9 °C. The first week and the last are not the same trip. Rain has already shifted: 6 days fewer than September had.

Daylight in October

11.4 hours of daylight, losing 1.1 hours across the month. That is between Busan's extremes of 14.5 and 9.8 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 22.8 °C in October — comfortable for a proper swim. The sea peaks at 26.9 °C in August and bottoms out at 13.9 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead. If the dates are flexible, September is the trade worth considering — 14 points weaker on weather, and materially quieter.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

October in Busan versus nearby

If Busan is one option among several, the nearby comparison is worth making. Daegu is close enough to be a coin toss — within a degree on temperature, the same number of rain days. Gwangju is close enough to be a coin toss — within a degree on temperature, the same number of rain days.

So: October is the answer for Busan. If it is booked out or priced out, May is the next best thing at 9 points behind, and January is the month to keep off the shortlist.

Every month in Busan

See all twelve months in Busan, or where else to go in October.