Highest temperature in Seoul (Incheon) on August 4?

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Market context

The **Incheon Airport** reading is being priced as a **0% favourite**, but the weather setup argues against treating that as a dead market. Forecasts for the Seoul metro area on 4 August point to extreme heat, with highs of **38°C in Seoul** and around **37°C in Incheon**, while one daily outlook says the Greater Seoul area remains under a heatwave pattern and that scattered showers should not be enough to break the heat[2][3]. For a market resolved on the day’s highest temperature at Incheon International Airport Station, the consensus appears to be that the outcome sits in the upper-30s Celsius range, so any band covering the mid-to-high 30s is where the value is likely clustered[3].

Historically, early August in Seoul is one of the hottest parts of the year, with climate norms putting daily highs around the mid-20s to low-30s Celsius and the hottest-day window typically around 4 August[13][18]. That makes today’s setup more of a heat-extreme than a standard summer reading, which is why the underdog angle is not the same as betting on a mild day: the market is essentially asking whether the airport station can briefly print a very high peak, rather than whether the whole day will feel hot. AccuWeather’s August outlook for Seoul shows forecast highs up to **88°F** over the month, which is consistent with a warm baseline, but the current heatwave call is materially above that average[1].

The main catalyst is the short-range forecast and whether cloud, sea-breeze effects, or afternoon showers clip the airport’s peak before settlement at **12:00 UTC**. SBS reported a **serious heat wave warning** beginning at 11:00 AM local time and temperatures near **38°C**, while Asiae also flagged that the rainfall expected later in the day would not relieve the heat[2][3]. That leaves the favourite angle on a high-but-not-extreme band, with contrarian value in assuming the airport underperforms the broader Seoul forecast if onshore flow or convective rain arrives early enough to cap the maximum[3][4].

Sources: 1 · 2 · 3 · 4 · 5

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