Highest temperature in Seoul on June 4?

Platform comparison

Active sub-markets

Market context

Seoul's weather on 4 June 2026 will be measured by the highest temperature recorded at Incheon International Airport Station that day, with settlement determined by Wunderground's historical data archive. Early June in Seoul typically sits in the warm-to-hot range, with average highs around 26–28°C, though the city regularly experiences days exceeding 30°C during early summer heat waves. The current 0% implied probability on Polymarket suggests either a technical issue with market initialisation or extreme confidence in a specific temperature band, a divergence worth noting against Kalshi's decimal-odds format, which can sometimes surface mispricing in weather markets where historical volatility is high.

Historical June temperature data from Incheon shows considerable year-to-year variation. Between 2015 and 2024, recorded highs on or near 4 June ranged from 23°C to 34°C, with the median around 28°C. This spread reflects Seoul's susceptibility to both cool maritime air masses and early-season continental heat surges. Traders comparing platforms should note that Betfair and Smarkets typically offer tighter liquidity on weather outcomes than Polymarket, though KYC requirements differ; Polymarket's US-focused user base may limit depth on Seoul-specific markets compared to regional Asian exchanges.

The primary catalyst remains the East Asian monsoon pattern and any anomalous high-pressure systems developing over the Korean Peninsula in early June 2026. Korea Meteorological Administration forecasts, typically issued 10 days prior, will be the key reference point for serious traders. Settlement hinges entirely on Wunderground's historical records for that specific station, making data-source reliability a material consideration when comparing this market across platforms.

Methodology

This page compares Highest temperature in Seoul on June 4? 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 Polymarket Alternative UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket 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.

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 Polymarket Alternative UK?

Zero. Polymarket Alternative UK 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, Polymarket Alternative UK 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.