Climate Yearbook

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

YearMonthAvg low CAvg high CRain and snow mmDays
2023January-7.62.032.431
2023February-4.55.81.428
2023March1.314.719.131
2023April6.317.995.430
2023May11.923.5151.931
2023June17.226.4225.930
2023July21.928.8450.431
2023August22.229.3308.431
2023September18.525.7184.330
2023October8.918.640.831
2023November1.09.6175.530
2023December-4.24.282.231
2024January-6.22.519.731
2024February-2.56.767.229
2024March-0.510.636.331
2024April8.220.650.130
2024May11.122.1123.031
2024June16.728.6102.030
2024July22.528.8442.531
2024August23.631.2148.431
2024September19.927.7227.330
2024October10.219.459.931
2024November3.212.444.630
2024December-4.22.94.631
2025January-5.61.916.631
2025February-6.62.05.828
2025March0.511.545.131
2025April5.717.380.230
2025May11.521.595.531
2025June18.627.8118.630
2025July23.531.6198.731
2025August23.330.6164.031
2025September18.726.1277.630
2025October12.019.4159.031
2025November2.612.213.630
2025December-4.43.642.231

Daily weather records

RecordDateValue
Hottest dayJuly 29, 202537.5 C
Coldest nightJanuary 24, 2023-18.4 C
Wettest daySeptember 20, 202486.1 mm

Weather data source: Open-Meteo Archive API. City metadata source: GeoNames cities15000.