Highest temperature in Beijing on July 12?

Platform comparison

Market context

Beijing’s highest temperature on 12 July 2026 will be recorded at the Beijing Capital International Airport Station, with settlement based on Wunderground’s daily peak in degrees Celsius. The prediction market currently shows 0% implied probability for a “YES” outcome on any specific range, yet Polymarket’s live odds favour 30°C at 27% and 31°C at 24%, revealing a stark divergence between the binary framing and the crowd’s temperature-range consensus [1].

Historically, July is Beijing’s hottest month, with average maximums near 33°C and recorded peaks reaching 42°C in 2010 and 41.9°C in 1999 [7][9]. In 2023, temperatures climbed to 40°C, and China’s national average for July 2023 was the hottest since 1961, driven by sustained heatwaves and high humidity [2][5][8]. These cases suggest that a 30–31°C peak is plausible but not extreme, making the 0% binary probability appear misaligned with the range market’s 51% combined odds for those two outcomes [1].

Traders should monitor real-time Wunderground updates for the Airport Station and watch for any official heatwave advisories from China’s National Meteorological Centre, which often precede record highs [1]. Recent reports confirm China experienced its hottest July on record in 2023, with Nanjiao observatory in southern Beijing exceeding 40°C, indicating that regional variability can shift airport readings significantly [5]. With settlement ending at 12:00 UTC on 12 July, the final hour of data will be decisive, and any divergence between airport and urban observatory readings could alter the resolved range.

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

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 Kalshi vs Polymarket. 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.

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 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.

Do I need to KYC for this market?

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