Highest temperature in Seoul on May 30?

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Market context

Seoul's weather on 30 May 2026 will depend on whether late spring conditions favour warm, settled air or cooler systems moving through the Korean peninsula. The settlement window closes at midday UTC, capturing the full diurnal temperature cycle at Incheon International Airport, the official measurement station. Current market pricing at 0% suggests traders expect temperatures to remain below the lowest available range threshold, though this reflects the market's nascent stage rather than meteorological certainty.

Historical May temperatures at Incheon show considerable variability. The station's 30-year average high for late May sits around 24–25°C, but individual years frequently exceed 28°C when Pacific high-pressure systems establish themselves over the region. May 2023 saw highs of 29–30°C during this period, whilst cooler years with northerly flow patterns have produced maxima near 20°C. The 0% probability currently assigned suggests the market is pricing in an unusually cold scenario or awaiting seasonal forecasts to anchor expectations.

Traders should monitor the Asian-Pacific weather pattern from mid-May onwards, particularly the position of the subtropical jet stream and any tropical cyclone activity in the western Pacific that could influence Korean peninsula conditions. South Korea's meteorological agency typically issues extended forecasts around 10 days prior to the settlement date. El Niño or La Niña conditions, currently neutral, may influence broader May circulation patterns, though their predictive value at this range remains limited.

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 Prediction Today, 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.

Is this market available outside the US?

Prediction Today is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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.

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.