Highest temperature in Seoul on June 2?

Platform comparison

Market context

On 2 June 2026, the highest temperature recorded at Incheon International Airport's weather station will determine which range this market settles into. The settlement uses Wunderground's historical data for that specific location, which serves as the authoritative source across most Western prediction platforms. Polymarket, Kalshi, and Betfair all reference identical underlying data for weather markets, though they differ in how they present odds—Polymarket uses decimal odds whilst Kalshi typically displays implied probability percentages, and Betfair offers both formats depending on interface selection. The 0% crowd probability suggests traders currently see no meaningful likelihood of the lowest temperature range, though this reflects positioning rather than meteorological certainty.

Seoul's June climate shows considerable year-to-year variation. Historical data from the Korea Meteorological Administration indicates June highs at Incheon range from 24°C in cooler years to 32°C during warmer patterns, with an average around 28°C. The current crowd assessment may reflect early-season uncertainty or thin liquidity rather than genuine consensus. Traders should monitor the Korean Meteorological Administration's seasonal forecasts released in May, which typically indicate whether the 2026 early summer will track warmer or cooler than the 30-year normal. El Niño or La Niña conditions in the preceding months could shift probabilities materially. Fee structures vary across platforms—Kalshi charges fixed fees whilst Polymarket and Betfair take percentage cuts—which affects whether small position adjustments remain economical as the settlement date approaches.

Methodology

This page compares Highest temperature in Seoul on June 2? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to PolyGram, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Resolution source: This market settles from the official publication at https://www.wunderground.com/history/daily/kr/incheon/RKSI. A proposer submits the result to the UMA Optimistic Oracle on Polygon, the two-hour challenge window opens, and the smart contract pays out in USDC.

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). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. PolyGram has a different geo footprint and routes to Polymarket's order book at 0% fees.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. PolyGram offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.