Seongnam-si climate: monthly averages: annual mean temperature 11.3 C; warmest month Aug (24.9 C); coldest month Jan (-3.3 C).
Annual mean temperature: 11.3 C
Warmest month: Aug (24.9 C)
Coldest month: Jan (-3.3 C)
Wettest month: Jul (11.63 mm/day)
All-time record high: 35.4 C
All-time record low: -21.3 C
A consolidated reference for Seongnam-si climate: monthly averages, rebuilt from public data on a schedule. Expect -3.3 C at the coldest (Jan) and 24.9 C at the warmest (Aug) — a 28.2 C spread. Expect a wet season rather than rain year-round: Jul brings 11.63 mm/day against 0.64 mm/day in Jan. Taken together that is roughly 1,231 mm of rain a year for the grid cell. Values come from a public open API; a successful result is cached so a later outage never blanks the page. Scroll for the month-by-month figures, or jump to a neighbouring location from the links below.
Annual mean temperature 11.3 C
Warmest month Aug (24.9 C)
Coldest month Jan (-3.3 C)
Wettest month Jul (11.63 mm/day)
All-time record high 35.4 C
All-time record low -21.3 C
Annual precipitation 1,237 mm / year
Coordinates 37.43861, 127.13778
Population 914,832
Average monthly temperature and rainfall in Seongnam-si
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
-3.3
0.64
13.3
-21.3
Feb
-0.9
1.08
15.0
-19.0
Mar
3.7
1.20
18.3
-9.3
Apr
9.8
2.40
25.2
-2.7
May
15.8
2.70
28.7
3.9
Jun
20.9
3.87
32.4
9.5
Jul
24.0
11.63
33.8
16.1
Aug
24.9
8.40
35.4
14.3
Sep
20.4
4.59
29.4
8.6
Oct
13.9
1.72
26.8
-1.3
Nov
6.5
1.56
21.2
-5.2
Dec
-1.0
0.71
14.3
-16.5
What the Seongnam-si climate table shows
Values are multi-decadal climatological averages for the 37.43861, 127.13778 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
Is Seongnam-si climate data a forecast?
No. These are multi-decadal averages for the grid cell, not a prediction for any particular year.
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.