Highest temperature in Shanghai on August 4?

Platform comparison

Market context

Shanghai’s **high temperature** on 4 August will be set by the maximum reading at Pudong Airport, which usually tracks the city’s broader late-summer heat rather than any one brief spike. The market’s crowd price of **0% YES** looks detached from the weather context: forecast pages for Shanghai around 4 August 2026 cluster in the low-to-mid 30s Celsius, with AccuWeather showing daily August highs from 82°F to 92°F and several other outlooks placing 4 August near 33–34°C.[1][2][3][6][10][15]

For comparison, Shanghai in August is typically hot, humid and often rain-affected, with long-run summaries putting average highs around 31–32°C and some guides noting that peaks can reach the mid-to-high 30s Celsius.[4][7][8][13][17] On these kinds of summer weather markets, Polymarket-style probabilities are easiest to read as a direct chance of the settlement bucket, while Kalshi and Smarkets users often need to translate between contract pricing, implied probability and any exchange fee overlay; Betfair’s exchange format adds commission and a back/lay spread that can make the same forecast look cheaper or dearer than a simple headline probability. KYC also matters: regulated venues usually have tighter onboarding and jurisdictional limits than crypto-forward books, so accessibility may differ even when the underlying forecast is the same.

The main catalysts are the live forecast updates through the day, especially if convection, a heat spike or cloud cover shifts the airport maximum by a degree or two. Shanghai’s August weather is also shaped by the East Asian monsoon and occasional typhoon influence, which can change the high even without a major storm making landfall.[13][17] Traders should watch the hourly trend into the settlement window and whether airport-specific observations diverge from city-wide forecast models, since this market resolves to the *highest* recorded temperature at Shanghai Pudong International Airport Station, not a city average.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Shanghai on August 4? 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

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.

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. Robinhood Prediction Markets 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. 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.