Highest temperature in Beijing on July 28?

Platform comparison

Market context

Beijing's highest temperature on 28 July 2026 will be recorded at the Capital International Airport Station and resolved against historical weather data. The crowd currently assigns zero probability to this market resolving, suggesting either extreme confidence in a specific temperature band or minimal trading activity. July represents the height of Beijing's summer season, when daily highs routinely exceed 30°C, with historical records from the same station showing peaks regularly in the 35–38°C range during late July.

Historical patterns from Beijing's meteorological records indicate that late July temperatures cluster heavily around 35–37°C, with occasional excursions above 38°C during particularly intense heat waves. The 2010 heat wave saw temperatures reach 40°C in parts of the city, though airport station readings tend to run slightly cooler than urban centres. The zero probability reading suggests traders may be waiting for seasonal forecasts or anchoring to a narrow expected range rather than genuinely dismissing all outcomes as impossible.

Traders should monitor China's meteorological forecasts released in early July 2026, which typically provide reliable 20–25 day outlooks for regional temperature patterns. The East Asian summer monsoon's strength and timing will be the primary driver of whether late July brings typical seasonal heat or anomalous conditions. Any significant atmospheric pressure systems or tropical cyclone activity in the region could shift temperatures materially, though such events are usually flagged in medium-range forecasts by mid-July.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Who Will Win. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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 trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.