Highest temperature in Beijing on July 28?

Platform comparison

Market context

Beijing's highest temperature on 28 July 2026 will be recorded at the Capital International Airport Station and settled against Wunderground historical data. July is peak summer in Beijing, with average daily highs around 29–31°C, though extreme heat events pushing above 35°C occur regularly during this period. The settlement window closes at midday UTC, meaning traders must account for the full diurnal cycle before resolution.

Historical July temperatures in Beijing show considerable year-to-year variation. The city experienced a 41.1°C reading in June 2022 during an exceptional heatwave, whilst more typical summer peaks range between 32–36°C. The 0% crowd probability across major platforms—Polymarket, Kalshi, and Betfair—suggests either extreme confidence in a narrow temperature band or sparse liquidity in this specific range. Kalshi's decimal-odds format and tighter regulatory framework may explain lower participation compared to Polymarket's implied-probability display, which traders often find more intuitive for weather markets. Fee structures differ materially: Kalshi charges flat settlement fees whilst Betfair's commission model rewards higher-volume traders, potentially affecting position sizing for this low-probability outcome.

Traders should monitor China Meteorological Administration forecasts released in late July, which typically provide 10-day outlooks with reasonable accuracy for maximum temperatures. Atmospheric pressure systems and any documented heat dome formation across northern China in the week preceding 28 July would be primary catalysts. Real-time station data from Wunderground updates daily, allowing verification of comparable dates' readings before settlement.

Methodology

This page compares Highest temperature in Beijing on July 28? 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

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.

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.