Highest temperature in Shanghai on August 2?

Platform comparison

Market context

Shanghai’s temperature on 2 August will be set by the hottest reading at Pudong International Airport before the market closes, and the seasonal backdrop is straightforward: early August is typically one of the city’s hottest periods, with average highs around the high 80s to low 90s Fahrenheit and a long tail into the mid-30s Celsius on hotter days.[1][4][8] Historical Shanghai August data also show that extreme heat is not rare, with recent years producing many days at or above 35°C and at least one modern August heat record well above that level.[3][5]

That makes a 0% YES crowd price on a high-temperature threshold easier to read as an expression of contract framing than of genuine cold weather risk. For platform comparison, Polymarket-style markets quote implied probability directly, while Kalshi and some exchange-style books often surface decimal or contract prices that traders mentally convert back into probability; Betfair and Smarkets typically add another layer through commission, so the same weather view can look cheaper or richer after fees. For this specific market, the decisive issue is not citywide averages but the airport station’s realised peak, which can diverge from downtown conditions and from forecast high ranges reported elsewhere.[9][10]

The main catalysts are the daytime forecast track, cloud cover, rainfall timing, and whether any thunderstorm outflow or sea-breeze effect suppresses the afternoon maximum. Current August guidance points to very warm conditions, with forecast highs for Shanghai around the low 30s Celsius and some models showing the first days of the month near the upper end of the seasonal range.[9][10] For a trader comparing books, the practical differences are KYC access and market rules rather than the weather itself: Kalshi is US-regulated, Betfair and Smarkets are narrower by jurisdiction, and the resolution source here is Wunderground’s airport history page, so late-day temperature revisions or station-specific spikes matter more than broad city forecasts.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Shanghai on August 2? 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

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

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.

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.

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.