Highest temperature in Seoul on June 27?

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Market context

Seoul is entering its peak summer heat phase on 27 June 2026, with the Incheon International Airport station expected to record temperatures near the upper end of typical June highs. Historical data shows daily highs in Seoul during June rising from 77°F to 81°F (25°C to 27°C), rarely exceeding 87°F (31°C) [2]. Summer in Seoul is influenced by the North Pacific high-pressure system, which can push temperatures as high as 35°C (95°F) on occasion [3]. The current market assigns a 0% probability to any outcome above 28°C, yet Polymarket data indicates a 69% chance for 28°C and a 30% chance for 29°C, suggesting a discrepancy between crowd-implied and frontrunner probabilities [1].

Traders should monitor real-time updates from Wunderground, the official resolution source, for any sudden spikes in temperature linked to local heatwaves or atmospheric shifts [5]. Recent records show South Korea hit an all-time high of 41.0°C in Hongcheon, indicating the region’s vulnerability to extreme heat events [5]. Additionally, the Korea Meteorological Administration reported that South Korea experienced its highest average summer temperature on record in recent years, with June to August averaging 25.6°C [9]. With settlement ending at 12:00 UTC on 27 June, any late-morning temperature surge could significantly alter the outcome, making live Wunderground data the critical catalyst for position adjustments.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

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.

FAQ

Where can I trade this market with the lowest fees?

On PolyGram, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What does it cost to trade on PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in minutes.