Highest temperature in Chengdu on August 17?

Platform comparison

Market context

Chengdu will experience peak summer heat on 17 August 2026, with the highest temperature recorded at Shuangliu International Airport determining the settlement outcome. The market resolves using Weather Underground's Daily Observations table rather than its summary display, a distinction that matters when automated systems report conflicting figures. This methodological specificity reflects how prediction markets must anchor to verifiable data sources when weather stations generate multiple readings throughout a single day.

Chengdu's August temperatures historically cluster between 32–36°C, with occasional peaks above 37°C during heat waves. The city's location in the Sichuan Basin creates a humid subtropical climate where afternoon highs frequently exceed morning records by 3–5°C. The 0% crowd probability suggests traders expect the market's upper temperature bracket to remain unbreached, though this assessment depends entirely on which bracket the market operator has defined. Across platforms, this type of weather market shows material divergence: Kalshi typically offers tighter decimal odds and lower fees (0.2%) than Polymarket's 2% structure, whilst Betfair's exchange model allows lay positions that Kalshi's binary format does not. KYC requirements favour Kalshi and Smarkets for UK-based traders, whereas Polymarket's reach extends to broader jurisdictions.

Traders should monitor mid-August weather forecasts from China Meteorological Administration and regional heat advisories. Any significant atmospheric pattern shift—monsoon activity, high-pressure systems, or tropical cyclone influence—could alter expected temperatures materially. The settlement window closes at 12:00 UTC on 17 August, requiring resolution before afternoon peaks typically occur in Chengdu's local timezone, which may create timing complications for real-time data verification.

Methodology

This page compares Highest temperature in Chengdu on August 17? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi Alternative, which mirrors the Polymarket order book at 0% fees.

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

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.

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. Kalshi 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. Kalshi 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.