Highest temperature in Chengdu on August 3?

Platform comparison

Market context

Chengdu’s airport is in a climate where early August is usually hot, humid and prone to short showers, so a high print in the low 30s Celsius is the base case rather than an outlier. Current model-style forecasts in the result set cluster around 33°C for 3 August, with one Met Office forecast even showing 35°C during the afternoon, which helps explain why a 0% YES price looks detached from the weather backdrop rather than from any one exact forecast line.[3][4][14]

Historically, Chengdu in August averages roughly 30°C to 32°C by day, with some sources placing typical highs nearer 30°C and others showing daily highs that can reach the mid-30s, especially in hot spells.[1][4][13][15] That matters for this market because the settlement is based on the single highest temperature recorded at Chengdu Shuangliu International Airport Station, not the daily average or the evening close, so even a brief afternoon peak can decide the outcome. On platforms like Polymarket, Kalshi, Betfair and Smarkets, the same weather event is usually displayed differently: some show direct implied probability, while exchange-style books may show decimal odds and net of commission, so identical expectations can look cheaper or dearer once fees are included.

For traders, the main catalysts are the day’s intraday forecast updates, local convection timing and whether cloud cover or rain arrives early enough to cap the afternoon maximum. The market closes before the end of the UTC settlement window, so the key dependency is the highest observed airport reading during the day rather than the final evening temperature. Any platform comparison also turns on access and friction: Kalshi’s KYC is US-focused, while Betfair and Smarkets operate as exchanges with commission, which can make a near-zero or near-certain weather contract behave differently after fees and spread.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Chengdu on August 3? 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

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

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. Robinhood Prediction Markets has a different geo footprint and routes to Polymarket's order book at 0% fees.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Robinhood Prediction Markets 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.