Highest temperature in Seoul on June 27?

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Market context

The real-world event at hand is the highest temperature recorded on 27 June 2026 at the Incheon International Airport Station in South Korea, measured in degrees Celsius. This single data point will determine the settlement of the prediction market, with the resolution sourced directly from Wunderground’s historical daily records for that specific station.

Historically, June in Seoul sees daily highs rising from 77°F to 81°F, rarely dipping below 68°F or exceeding 87°F, which translates roughly to 25°C to 31°C [2]. The market’s current crowd-implied probability of 0% for a “YES” outcome appears misaligned with this baseline, as recent years have shown consistent warmth; for instance, the highest temperature recorded in Seoul this June so far was 91°F (32.8°C) on 19 June 2026 [5]. Even the all-time national heat record of 41.0°C occurred in Hongcheon, not Seoul, but regional trends confirm that 28°C–29°C is a plausible and frequent range for late June [3].

Traders should monitor meteorological forecasts for the coming days, particularly any announcements regarding monsoon onset or high-pressure systems that could suppress temperatures. A recent report notes South Korea endured its hottest summer on record in 2025, with an average June–August temperature of 25.7°C, the highest since 1973, suggesting a continued warming trend [7]. Programmatically, one would fetch Wunderground’s real-time API for Incheon Airport, apply a conditional order if the forecasted high exceeds 28°C, and adjust exposure based on the 4°F weekly temperature increase typical for this period [2]. No moralising is needed—only factual alignment with observed climate patterns and live data dependencies.

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.

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.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.