Highest temperature in Seoul on May 30?

Platform comparison

Active sub-markets

Market context

Seoul's weather on 30 May 2026 will be measured at Incheon International Airport Station, with the highest recorded temperature that day determining which range the market resolves to. Late May in Seoul typically sits in the warm-to-hot band, with historical highs around 28–32°C, though outlier days occasionally breach 33°C. The current 0% implied probability suggests traders are either waiting for additional context before committing capital or the market has insufficient liquidity to establish a baseline view.

Historical May temperature data from Incheon shows considerable year-to-year variance. The past decade has recorded May highs ranging from 26°C to 34°C depending on whether early monsoon systems or high-pressure ridges dominate. Comparable late-May forecasting on other platforms—Kalshi's weather contracts, for instance, typically see modest trading volume until the settlement window narrows to two weeks—indicates that probability clustering often remains flat until meteorological models gain confidence. Polymarket's decimal-odds format and lower KYC barriers may attract earlier speculative positioning than Kalshi's regulated US-focused book, where weather contracts face stricter settlement verification requirements.

Traders should monitor the Korean Meteorological Administration's monthly outlooks, typically released mid-April, which flag whether ridge patterns or trough systems are expected for late May. Wunderground's historical data feed—the designated resolution source—updates daily and remains accessible across all major prediction platforms, though fee structures differ: Kalshi charges flat per-contract fees whilst Polymarket applies percentage-based taker fees. Any tropical system tracking toward the Korean peninsula in the weeks prior would materially shift temperature expectations downward.

Methodology

We read Highest temperature in Seoul on May 30? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live quote comes directly from the Polygon order book; the other three are listed with their platform attributes — fees, KYC, settlement currency, payment options — because a 1:1 contract comparison without API access would be guesswork.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). Kalshi Alternative UK routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

FAQ

Where can I trade this market with the lowest fees?

On Kalshi Alternative UK, 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?

Kalshi Alternative UK 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.

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.

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.