Seongnam-si weather in 2025
Seongnam-si weather in 2025, with 365 daily observations from Open-Meteo archive data.
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Use the graph view to inspect 2025 alongside other available years for Seongnam-si.
Year summary
In 2025, Seongnam-si averaged 17.2 C for daily highs and 8.4 C for daily lows.
A 1991-2020 normal is not available for this location yet, so this page compares 2025 with the 2023-2025 archive baseline. The 2025 average daily high was -0.2 C from that baseline, and total precipitation was -219.8 mm from the baseline total.
The warmest month was July, with an average high of 31.6 C, while February had the lowest average low at -6.6 C.
The wettest month was September, totaling 277.6 mm. The hottest day reached 37.5 C on July 29, 2025.
Monthly averages and precipitation
| Month | Avg low C | Avg high C | Rain and snow mm | Days |
|---|---|---|---|---|
| January | -5.6 | 1.9 | 16.6 | 31 |
| February | -6.6 | 2.0 | 5.8 | 28 |
| March | 0.5 | 11.5 | 45.1 | 31 |
| April | 5.7 | 17.3 | 80.2 | 30 |
| May | 11.5 | 21.5 | 95.5 | 31 |
| June | 18.6 | 27.8 | 118.6 | 30 |
| July | 23.5 | 31.6 | 198.7 | 31 |
| August | 23.3 | 30.6 | 164.0 | 31 |
| September | 18.7 | 26.1 | 277.6 | 30 |
| October | 12.0 | 19.4 | 159.0 | 31 |
| November | 2.6 | 12.2 | 13.6 | 30 |
| December | -4.4 | 3.6 | 42.2 | 31 |
Daily records in 2025
| Record | Date | Value |
|---|---|---|
| Hottest day | July 29, 2025 | 37.5 C |
| Coldest night | February 4, 2025 | -13.6 C |
| Wettest day | July 17, 2025 | 59.3 mm |
Related pages
Weather data source: Open-Meteo Archive API. City metadata source: GeoNames cities15000.