Historical weather in Seongnam-si, South Korea
Seongnam-si weather history for 2023-2025, with daily temperatures, precipitation, monthly summaries, and records from Open-Meteo archive data.
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Weather summary
Across 2023-2025, Seongnam-si averaged 17.4 C for daily highs and 8.2 C for daily lows across 1096 daily observations.
The warmest month was July 2025, with an average high of 31.6 C, while January 2023 had the lowest average low at -7.6 C.
The wettest month was July 2023, totaling 450.4 mm of precipitation.
The hottest day reached 37.5 C on July 29, 2025; the coldest night fell to -18.4 C on January 24, 2023.
Monthly summary table
| Year | Month | Avg low C | Avg high C | Rain and snow mm | Days |
|---|---|---|---|---|---|
| 2023 | January | -7.6 | 2.0 | 32.4 | 31 |
| 2023 | February | -4.5 | 5.8 | 1.4 | 28 |
| 2023 | March | 1.3 | 14.7 | 19.1 | 31 |
| 2023 | April | 6.3 | 17.9 | 95.4 | 30 |
| 2023 | May | 11.9 | 23.5 | 151.9 | 31 |
| 2023 | June | 17.2 | 26.4 | 225.9 | 30 |
| 2023 | July | 21.9 | 28.8 | 450.4 | 31 |
| 2023 | August | 22.2 | 29.3 | 308.4 | 31 |
| 2023 | September | 18.5 | 25.7 | 184.3 | 30 |
| 2023 | October | 8.9 | 18.6 | 40.8 | 31 |
| 2023 | November | 1.0 | 9.6 | 175.5 | 30 |
| 2023 | December | -4.2 | 4.2 | 82.2 | 31 |
| 2024 | January | -6.2 | 2.5 | 19.7 | 31 |
| 2024 | February | -2.5 | 6.7 | 67.2 | 29 |
| 2024 | March | -0.5 | 10.6 | 36.3 | 31 |
| 2024 | April | 8.2 | 20.6 | 50.1 | 30 |
| 2024 | May | 11.1 | 22.1 | 123.0 | 31 |
| 2024 | June | 16.7 | 28.6 | 102.0 | 30 |
| 2024 | July | 22.5 | 28.8 | 442.5 | 31 |
| 2024 | August | 23.6 | 31.2 | 148.4 | 31 |
| 2024 | September | 19.9 | 27.7 | 227.3 | 30 |
| 2024 | October | 10.2 | 19.4 | 59.9 | 31 |
| 2024 | November | 3.2 | 12.4 | 44.6 | 30 |
| 2024 | December | -4.2 | 2.9 | 4.6 | 31 |
| 2025 | January | -5.6 | 1.9 | 16.6 | 31 |
| 2025 | February | -6.6 | 2.0 | 5.8 | 28 |
| 2025 | March | 0.5 | 11.5 | 45.1 | 31 |
| 2025 | April | 5.7 | 17.3 | 80.2 | 30 |
| 2025 | May | 11.5 | 21.5 | 95.5 | 31 |
| 2025 | June | 18.6 | 27.8 | 118.6 | 30 |
| 2025 | July | 23.5 | 31.6 | 198.7 | 31 |
| 2025 | August | 23.3 | 30.6 | 164.0 | 31 |
| 2025 | September | 18.7 | 26.1 | 277.6 | 30 |
| 2025 | October | 12.0 | 19.4 | 159.0 | 31 |
| 2025 | November | 2.6 | 12.2 | 13.6 | 30 |
| 2025 | December | -4.4 | 3.6 | 42.2 | 31 |
Daily weather records
| Record | Date | Value |
|---|---|---|
| Hottest day | July 29, 2025 | 37.5 C |
| Coldest night | January 24, 2023 | -18.4 C |
| Wettest day | September 20, 2024 | 86.1 mm |
Related pages
Weather data source: Open-Meteo Archive API. City metadata source: GeoNames cities15000.