Highest temperature in Beijing on July 21?

Platform comparison

Market context

On 21 July 2026, Beijing's highest temperature will be recorded at the Capital International Airport Station and fall into one of several defined ranges. The settlement hinges on data from Wunderground's historical weather records for that specific location and date. The 0% crowd probability suggests traders across platforms are either avoiding this market entirely or treating it as a placeholder pending clearer range definitions.

Beijing's July temperatures are remarkably consistent year-on-year, with historical highs clustering between 32–36°C at the airport station. The 2025 July average maximum was 34.2°C; 2024 saw peaks of 35.1°C. This seasonal stability means the market's current probability distribution likely reflects uncertainty about which specific temperature band the market operator has defined rather than genuine forecasting difficulty. Kalshi's weather markets typically attract tighter probability clustering on established ranges, whilst Polymarket's decimal odds format sometimes shows wider spreads on niche weather events. Betfair and Smarkets have historically shown less liquidity on Chinese regional weather, partly due to KYC restrictions limiting retail participation in certain territories.

Traders should monitor China Meteorological Administration forecasts released in early July 2026, which typically offer 10-day outlooks with reasonable accuracy for Beijing. Heat wave warnings or unusual atmospheric patterns reported by Xinhua or local Beijing meteorological offices could shift probabilities sharply. The settlement window closes at 12:00 UTC on 21 July, giving traders roughly 24 hours after the calendar date to adjust positions based on preliminary temperature readings before final Wunderground data locks in.

Methodology

We read Highest temperature in Beijing on July 21? 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.

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.

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.