Highest temperature in Chengdu on July 31?

Platform comparison

Market context

Chengdu’s airport station is being asked to print the day’s top reading, and the live market is really about whether the city gets a routine hot-season maximum, or something well above the usual July range. Forecasts for 31 July cluster around the low-to-mid 30s Celsius, with several sources showing highs near 33°C to 35°C and one travel guide putting the day as high as 35.7°C, which is warm enough that a **0% YES** implied price looks anchored to the wrong range rather than to any single exact number.[2][6][9][12][20] For a temperature market on Polymarket, that kind of pricing is only useful if the book’s range bands are materially different from the exchange odds elsewhere: Kalshi and Betfair-style platforms often show decimal prices or back/lay structure rather than a single implied probability, while Smarkets typically quotes in decimal and charges commission, so the same forecast can look cheaper or more expensive after fees and spread.

Historically, Chengdu in July is hot, humid, and often rainy, with average daytime temperatures commonly cited around 30°C to 31°C and multiple days each month reaching the mid-30s.[6][10][14][18][20] That matters because a few degrees can decide the settlement band, and airport-station readings can differ from city-centre forecasts due to local exposure, cloud breaks, and afternoon convection. The current setup therefore reads like a market trading below the meteorological norm rather than a genuine nil chance.

The main catalysts are the day’s evolving rain and cloud pattern, plus any late-morning or early-afternoon heating window before showers build. Forecast services currently show precipitation risk, but also enough warmth and light wind for a brief spike if skies clear, so traders will watch hourly updates rather than the daily high alone.[2][4][8][9][11] On venue mechanics, access also matters: Polymarket is broadly open to crypto-native users, while Kalshi and Betfair-style books usually involve tighter KYC and jurisdictional limits, and that can affect how quickly prices move as the weather updates in the final hours before the 12:00 UTC settlement cutoff.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Chengdu on July 31? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Polymarket Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Polymarket Alternative offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.