Highest temperature in Shanghai on July 25?

Platform comparison

Market context

Shanghai's summer temperatures in late July typically peak between 32–36°C, with occasional spikes above 37°C during heat waves. The settlement hinges on the single highest reading recorded at Pudong International Airport on 25 July 2026, resolved via Wunderground's historical weather database. The 0% crowd probability suggests either extreme confidence in a specific temperature band or minimal trading volume on this particular outcome range.

Historical Shanghai weather data from the past decade shows July 25th has recorded highs ranging from 31°C to 35°C in most years, with 2013 and 2017 reaching 36°C. The current probability distribution across temperature brackets will depend heavily on how traders interpret seasonal patterns versus any anticipated weather systems. Kalshi's strict regulatory framework and Polymarket's broader international reach mean different trader demographics may weight historical volatility differently; Betfair and Smarkets typically show tighter spreads on weather markets with established liquidity, though this specific date-location combination may lack depth across all platforms.

The China Meteorological Administration issues extended forecasts approximately two weeks before the settlement date, which could trigger significant probability shifts if anomalous patterns are flagged. Tropical cyclone activity in the Western Pacific during mid-July could alter Shanghai's weather trajectory substantially. Traders should monitor late-June forecasts from both Chinese and international meteorological services; fee structures on Polymarket (2% taker) versus Kalshi (no commission but fixed spreads) will influence whether small probability movements justify position adjustments closer to settlement.

Methodology

We read Highest temperature in Shanghai on July 25? 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

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.

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.