Highest temperature in Chengdu on July 16?

Platform comparison

Market context

Chengdu is sweltering under a sweltering heatwave today, with AccuWeather forecasting a high of 100°F (37.8°C) for the Chengdu Shuangliu International Airport, while current conditions at 10 AM already show 84°F with a RealFeel of 97°F[5]. The crowd-implied 0% probability for any specific outcome appears misaligned with the frontrunner "37°C" holding 35% and "38°C" at 34%, suggesting the market is pricing a narrow band rather than a binary event[4].

Historically, July in Chengdu is the peak of the rainy season, where abundant downpours can suppress daytime highs to around 25°C (77°F), yet midday humidity often intensifies the heat to furnace-like levels[7]. Average July highs sit near 30°C (86°F), but recent forecasts for July 2026 show daily highs ranging from 83°F to 103°F (28°C–39.4°C), indicating this year’s heat is pushing well above the long-term mean[1][7]. Traders should watch for afternoon thunderstorms widely separated across the region, which AccuWeather warns could occur this afternoon and cool temperatures significantly if they materialise[5].

The primary catalyst is the timing and intensity of these thunderstorms, as heavy rainfall is the only reliable mechanism to drop temperatures below the 35°C threshold cited in recent travel guides[10]. Monitor the hourly forecast updates for wind shifts and precipitation probability, which currently sits at 40% by noon and 70% by 10 PM[5]. Settlement relies on Wunderground’s recorded maximum for ZUUU, so any late-afternoon storm delaying the peak temperature reading could alter the final range[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

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 Prediction Today. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.