Highest temperature in Chengdu on July 27?

Platform comparison

Market context

Polymarket has this contract at **0% YES**, so the order book is currently implying no chance that Chengdu Shuangliu International Airport’s daily high lands in the YES range for 27 July. The market settles against the highest temperature recorded on Wunderground for that station, with USDC held in the Polygon-based conditional token structure, so traders are effectively pricing a single airport-observed maximum rather than a broader Chengdu city reading.

For context, Chengdu’s July climate is typically warm, humid and rain-prone, with recent weather guides putting average July highs around **30°C** and describing frequent showers during the month.[3][4] That makes the relevant question less about an extreme heat event than about whether afternoon cloud, rain or a passing system caps the airport’s peak below the contract’s threshold. Current conditions around Chengdu are already in the mid-20s Celsius with elevated humidity, which is consistent with a summer pattern that can still produce short-lived spikes if cloud cover breaks late in the day.[1]

A trader watching this market should focus on airport-specific temperatures rather than city forecasts, because the settlement source is the Wunderground history page for Chengdu Shuangliu International Airport Station.[3] The key catalysts are the day’s diurnal heating cycle, rainfall timing, and any forecast revisions that change afternoon sunshine or convection; weather forecast services for Chengdu currently show a broad July range with recurring rain, which can suppress highs even when the month is seasonally hot.[2][3]

Sources: 1 · 2 · 3 · 4

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

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'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.

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

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.