This page is a single place to check Jeju City climate: monthly averages. Jeju runs from 7.4 C in Jan to 26.8 C in Aug, a swing of 19.4 C. Rain is spread through the year, with Aug the wettest month at 8.43 mm/day and Jan the driest at 1.62 mm/day. Taken together that is roughly 1,575 mm of rain a year for the grid cell. The same build that regenerates the sitemap refreshes these values, and unchanged pages are left untouched. Use the table for exact numbers, or the related pages below for neighbouring locations and periods.
Annual mean temperature 16.2 C
Warmest month Aug (26.8 C)
Coldest month Jan (7.4 C)
Wettest month Aug (8.43 mm/day)
All-time record high 31.1 C
All-time record low -1.8 C
Annual precipitation 1,577 mm / year
Coordinates 33.50972, 126.52194
Population 488,844
Average monthly temperature and rainfall in Jeju City
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
7.4
1.62
17.6
-1.8
Feb
7.9
2.32
16.4
0.2
Mar
9.9
2.90
17.2
1.7
Apr
13.1
4.55
19.3
5.7
May
16.6
4.56
22.9
11.1
Jun
20.6
6.40
25.6
14.8
Jul
24.8
7.75
30.0
19.1
Aug
26.8
8.43
31.1
21.6
Sep
23.6
6.17
28.5
17.8
Oct
19.3
2.88
25.9
10.2
Nov
14.5
2.41
22.2
6.6
Dec
9.6
1.82
19.5
1.7
What the Jeju City climate table shows
Values are multi-decadal climatological averages for the 33.50972, 126.52194 grid cell, not a single year. Rain is the daily mean, so a value of 2.00 mm/day is about 60 mm across a 30-day month. Averages smooth over extremes, so use them for planning rather than for what to pack for next Tuesday.
Frequently asked questions
Why do the numbers differ from a weather app?
An app shows one location on one day. These are long-run averages, so they smooth out single hot or cold spells.
How much rain is 8.43 mm/day in a month?
Rain is recorded as a daily mean, so 8.43 mm/day is roughly 256 mm across a 30-day month.