Highest temperature in Chengdu on July 27?

Platform comparison

Market context

The real-world event here is the **highest temperature measured at Chengdu Shuangliu International Airport Station** on 27 July 2026, with the market settling to the temperature band that contains that peak reading. In simple terms, a **YES** share pays out if the final recorded maximum falls inside the market’s specified range, while a **NO** share does not; the resolution comes from Wunderground’s daily history for that station, not from citywide averages or a generic forecast. Chengdu’s July climate is typically hot, humid and rain-prone, with average highs around **30°C** and frequent rainfall, so the market is really about whether conditions at the airport reach or exceed the upper end of that normal summer range.[3]

For context, recent forecast snapshots point to highs in the **mid-30s Celsius** in Chengdu over the next two weeks, while BBC Weather shows current conditions around **24°C** with high humidity, underlining how quickly daytime maxima can move in summer.[1][2] For a newcomer to prediction markets, the current **0% YES** crowd-implied probability means traders are assigning no weight to the outcome that matches the YES band, but that does not describe the weather itself; it only reflects the market price. Comparable Chengdu summer summaries also emphasise that July can produce both heat and frequent rain, which matters because cloud cover and showers can cap the airport’s maximum temperature even on otherwise warm days.[3][4]

The main catalysts are the day’s actual weather sequence at the airport, especially whether sunshine breaks through long enough to lift the maximum before showers or thunderstorms arrive, plus any abrupt forecast updates from local and international weather services. Chengdu’s July weather is shaped by high humidity and a sizeable rainy-season pattern, so traders typically watch short-range temperature forecasts, precipitation timing, and any shift in wind or cloud cover rather than relying on the monthly average alone.[1][3][4] Because the market resolves from a single station reading, a warmer or cooler pocket elsewhere in the city is irrelevant unless it is reflected at Chengdu Shuangliu International Airport Station.[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

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