Highest temperature in Seoul on June 23?

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Market context

Seoul is entering a period of intensifying heat and humidity as the monsoon season approaches, with the Korea Meteorological Administration confirming this summer will be hotter and wetter than average. The Buddha’s Birthday holiday, spanning 23–25 June, is forecast to be mostly clear nationwide, creating a temporary window of stable conditions before the expected surge in rainfall and tropical heat later in the month. This shift in the 48-hour outlook—moving from clear skies to impending moisture—directly frames why the current crowd-implied probability for extreme highs on 23 June sits at 0% YES.

Historical June patterns in Seoul show daily highs typically ranging between 21°C and 29°C, with the warmest days often occurring in the latter half of the month as humidity builds. While 23 June has not historically been the peak heat day, the KMA’s three-month outlook indicates June averages will exceed the 30-year norm, pushing temperatures toward 28°C–30°C by 24–25 June. Traders should watch for real-time updates from Wunderground on the Incheon Intl Airport Station, as the resolution depends solely on the highest recorded temperature for all times on 23 June, and any unexpected cloud cover or early rain could suppress the peak.

The key catalysts to monitor are the KMA’s daily short-range forecasts and any sudden shifts in monsoon activity, which could bring light rain to Busan and Jeju on 23 June but leave Seoul clear. Recent reports from Chosun.com confirm that daytime temperatures are projected to reach up to 28°C on 24 June and 30°C on 25 June, suggesting 23 June may not be the absolute peak. Traders should also track humidity levels and wind speed via real-time weather apps, as high humidity can amplify perceived heat even if recorded temperatures remain moderate.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Seoul on June 23? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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