Highest temperature in Beijing on July 16?

Platform comparison

Market context

The market tracks the peak Celsius temperature recorded at Beijing Capital International Airport on 16 July 2026, with settlement tied to Wunderground’s daily high for that specific station. Programmatic traders should script a listener for the Wunderground history endpoint to auto-resolve the contract once the 12:00 UTC cutoff passes, bypassing manual verification.

Historical averages for Beijing in July sit between 23°C and 31°C, with the month typically being the wettest due to high rainfall volumes averaging 185 mm[2]. Despite these norms, the current crowd-implied probability of 0% for the YES outcome appears misaligned with the frontrunner outcome of 33°C holding 39% probability, while 34°C follows at 27%[1]. This divergence suggests the market is pricing a hot, dry outlier rather than the standard humid baseline, a pattern a bot should flag as a potential arbitrage if historical variance data supports higher extremes.

Traders monitoring this event must watch for real-time heatwave announcements from the China Meteorological Administration, as sudden shifts in atmospheric pressure can spike temperatures above the 31°C average. The primary dependency is the 12:00 UTC settlement window on 16 July 2026, after which Wunderground publishes the definitive high[1]. Automated strategies should ingest the live Wunderground feed every minute during the settlement day to capture the exact peak before the market resolves, ensuring conditional orders execute at the precise threshold without latency.

Sources: 1 · 2

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 Polymarket Bot UK. 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.

Do I need to KYC for this market?

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