Highest temperature in Chengdu on July 31?

Platform comparison

Market context

Chengdu Shuangliu International Airport’s highest temperature on 31 July is typically read against a hot, humid midsummer baseline rather than an extreme-heat climatology. Seasonal references for Chengdu in July cluster around the low 30s Celsius, with several forecasters putting today’s high in the 33–37°C band and some public forecasts reaching 38°C, which means the market is mainly about where the official daily maximum lands within that familiar summer range rather than whether heat occurs at all.[2][8][11][14][19]

The current 0% YES implication looks mispriced only if the venue expects the airport observation to fall outside the listed contract range; otherwise it reflects either a very low-probability tail or a platform quoting structure that is not directly comparable. On Polymarket, traders usually see explicit implied probability, while Kalshi and Smarkets tend to surface contract price or decimal-style odds, and Betfair’s exchange format adds commission on net winnings, so the same weather view can appear different once fees and format are normalised. KYC access also differs by venue and jurisdiction, which matters for a Chengdu weather market because participation is often more constrained by platform availability than by the forecast itself.

For catalysts, the key inputs are the airport’s realised afternoon temperature, cloud cover, and any convective rain or thunderstorm that suppresses the day’s peak; even a brief late-morning or early-afternoon clear spell can lift the maximum materially. Recent forecasts for Chengdu point to partly cloudy or cloudy conditions with highs around the low-to-mid 30s Celsius and some rain risk, so traders should watch hourly updates rather than just the daily headline. Because the market settles on the highest temperature recorded for the whole day at Chengdu Shuangliu International Airport Station, intraday swings around the noon-to-afternoon window are the main driver of the final bucket.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Chengdu on July 31? 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 Robinhood Prediction Markets, 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

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.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

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.