Highest temperature in Beijing on July 10?

Platform comparison

Market context

Beijing is entering its hottest month, with July historically delivering peak temperatures that frequently exceed 35°C during heatwaves, yet the current prediction market for 10 July 2026 shows a 94% implied probability that the highest temperature will stay within a specific lower range. This odds level suggests traders are betting against a record-breaking spike, despite the city’s all-time high of 41.9°C recorded on 24 July 1999 and a recent 2023 peak of 40°C in the same month[1][3].

Historical data frames this probability as cautious but plausible; average daily highs in July hover around 31°C (88°F), rarely dropping below 26°C or exceeding 36°C, with the warmest average occurring on 17 July[4]. While 2024 saw China’s hottest month in recent history and 2026 Beijing temperatures were +27.9°C, over 5°C above the prior record, the market’s divergence from Polymarket’s leading outcome of “29°C” at 26% indicates a meaningful gap in cross-platform consensus[2][7][9].

Traders should monitor the Beijing Meteorological Bureau’s daily heatwave alerts and the timing of the East Asian monsoon front, which can suppress temperatures near 28°C during frontal passages[8]. Recent authorities have urged residents to limit outdoor exposure due to record highs, signalling active heat management that may influence local temperature readings[3]. No major weather announcements are scheduled for 10 July, but the settlement window ending at 12:00 UTC means afternoon peaks will be decisive.

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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 Best Prediction Markets. 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's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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.