Highest temperature in Beijing on June 28?

Platform comparison

Market context

On 28 June 2026, the Beijing Capital International Airport Station will record its peak daily temperature, a real-world event that directly determines the outcome of this prediction market. The current crowd-implied probability for a YES outcome sits at 0%, suggesting the consensus firmly expects the temperature to fall outside the favoured range, likely below the threshold in question. This stark positioning mirrors historical patterns where June in Beijing typically sees highs exceeding 30°C, with rare exceptions only during cold air intrusions or heavy rainfall, as noted by travel guides covering the region’s summer climate[3].

Historical data frames this probability with clarity: June in Beijing usually features daily highs rising from 84°F to 87°F, rarely dipping below 73°F or exceeding 96°F, while extreme heatwaves have pushed temperatures to 41.1°C, shattering June records in 2023[2][9]. The 2023 heatwave, which saw Beijing hit 106°F (41°C), remains the highest June temperature since 1961, reinforcing that extreme heat is not an anomaly but a recurring catalyst in this period[8]. Traders should watch for official meteorological announcements regarding cold air forecasts or rain schedules, as these are the primary dependencies that could suppress temperatures below the threshold; recent reports from Reuters confirm Beijing’s vulnerability to blistering heatwaves returning in late June, making contrarian bets on lower temperatures a high-risk value spot unless such warnings materialise[4].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.