Highest temperature in Seoul on May 31?

Platform comparison

Active sub-markets

Market context

On 31 May 2026, the highest temperature recorded at Incheon International Airport Station will fall into one of several defined ranges, measured in degrees Celsius. The settlement hinges on historical weather data from Wunderground, which aggregates observations from this specific monitoring point rather than Seoul city proper—a distinction that matters, as airport stations often record slightly different conditions than urban centres due to proximity to water and runway microclimates.

Seoul's late May climate sits at the threshold between spring and early summer, with historical highs typically ranging from 26°C to 29°C during this period. The 0% crowd probability suggests traders on this platform are either avoiding the market entirely or treating it as a placeholder pending clearer range definitions. Comparable May 31st data from prior years shows considerable year-to-year variance; the city experienced 28°C in 2023 and 25°C in 2022, illustrating why seasonal forecasting carries genuine uncertainty. Kalshi's binary-focused user base may explain the sparse activity here, whereas Polymarket's decimal-odds infrastructure and Smarkets' lay-betting mechanics could theoretically accommodate more granular temperature bands, though none currently show meaningful liquidity on this specific date.

Traders should monitor the Korea Meteorological Administration's seasonal outlook, typically released in April, which flags whether May 2026 will trend warmer or cooler than the 30-year average. Typhoon activity in the Western Pacific during late spring can suppress temperatures; conversely, high-pressure systems from the north drive heat. The settlement window closes at noon UTC on 31 May, giving traders only the morning's readings to act upon—a compressed timeframe that may explain why offshore books like Betfair have shown limited interest in granular weather markets for this region.

Methodology

This page compares Highest temperature in Seoul on May 31? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to Kalshi Alternative UK, which mirrors the Polymarket order book at 0% fees.

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.

Do I need to KYC for this market?

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