Highest temperature in Beijing on July 21?

Platform comparison

Market context

Beijing's highest temperature on 21 July 2026 will be recorded at Capital International Airport Station and resolved via Wunderground historical data. The settlement window closes at midday UTC, meaning traders must account for the full calendar day in Beijing time (UTC+8) before the market locks. This timing constraint differs materially from how Kalshi structures US weather markets, which typically settle on local midnight, giving Kalshi punters an extra eight hours of price discovery.

July in Beijing typically sees daily highs between 29–34°C, though extreme heat events pushing above 37°C occur roughly once per decade during summer. The 0% crowd probability suggests either extreme confidence in moderate conditions or thin liquidity on this specific market. Comparable markets on Betfair and Smarkets for European summer temperatures show decimal odds clustering around 1.5–2.0 for similar heat thresholds, implying 50–67% implied probability ranges; the absence of such pricing here may reflect Polymarket's lower trading volume on niche weather outcomes or a genuine consensus view. Kalshi's KYC requirements and US-focused user base mean this Beijing market draws primarily from Polymarket's international cohort, potentially explaining lower participation.

The China Meteorological Administration publishes 10-day forecasts weekly; the most recent bulletin will inform late-June positioning. El Niño conditions and the East Asian summer monsoon trajectory through early July represent the primary drivers of whether Beijing experiences a heat spike or near-normal conditions. Traders should monitor official CMA advisories and Wunderground's historical volatility bands for 21 July across prior years to calibrate range expectations.

Methodology

This page compares Highest temperature in Beijing on July 21? 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 Polymarket Alternative, 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

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. Polymarket Alternative 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. Polymarket Alternative 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.