Highest temperature in Shanghai on July 28?

Platform comparison

Market context

Shanghai's peak temperature on 28 July 2026 will be recorded at Pudong International Airport Station and settled against historical weather data from Wunderground. July is Shanghai's hottest month, with average highs around 32°C and frequent days exceeding 35°C. The 0% crowd probability suggests traders are either absent from this market or treating it as a placeholder pending range clarification, which is typical for weather markets with narrow settlement windows and specific geographic anchors.

Historical July temperatures in Shanghai show consistent clustering above 30°C, with extreme heat days (36–39°C) occurring roughly once per week during peak summer. The current probability distribution appears inverted or incomplete across available platforms—Polymarket's decimal odds format sometimes masks thin liquidity in niche weather markets, whilst Kalshi's categorical structure and Betfair's fractional odds present the same underlying event differently. Smarkets' commission-based model can inflate apparent spreads on low-volume weather contracts. Comparing these books on Shanghai July heat requires normalising their odds formats: a 0% reading on one platform may reflect genuine consensus or simply low trading activity rather than genuine predictive confidence.

Traders should monitor China Meteorological Administration forecasts released in early July 2026, which typically project temperature ranges 7–10 days ahead. Typhoon activity in the Western Pacific during late July can suppress Shanghai temperatures by 2–5°C, whilst high-pressure systems over eastern China drive extreme heat. Settlement depends entirely on Wunderground's historical data capture for that specific station, making data availability and sensor calibration the final resolution risk rather than meteorological uncertainty.

Methodology

We read Highest temperature in Shanghai on July 28? 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.

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.

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.