Highest temperature in Shanghai on July 24?

Platform comparison

Market context

Shanghai Pudong International Airport has already sat in a hot July regime this month, with forecast services pointing to highs around 32–35°C and a warm, humid finish to the month rather than a sharp cool-down. July is normally Shanghai’s wettest period, with substantial rainfall and frequent showers, so the practical question for this market is whether cloud cover and convection cap the daytime peak or allow a brief surge above the low-30s Celsius range.[2][4][5]

The crowd-implied 0% YES looks out of line with the climate backdrop, but it should be read against how these books price outcomes. On Polymarket, the market is framed as a direct probability; on Kalshi it is typically an exchange-style contract with a $1 payout at settlement, while Betfair and Smarkets express prices as decimal odds with exchange commissions applied on winnings rather than embedded in the quote. That means the same “unlikely” outcome can screen very differently once fees, tick size, and access restrictions are considered, especially if a venue applies stricter KYC or limits participation by jurisdiction.

For traders, the key catalysts are the short-range forecast updates, any rain or thunderstorm timing over Pudong, and whether the day turns into a damp, cloudy setup or a sunnier one with stronger surface heating. Forecast sources currently show a warm peak near 35–37°C for Shanghai and a meaningful rain chance, so even small shifts in cloud and precipitation timing can matter to the daily maximum.[1][3] The settlement source is Wunderground’s history page for Shanghai Pudong International Airport Station, so the final figure depends on that station’s reported high rather than citywide averages.[1]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Shanghai on July 24? 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.

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. 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.