Highest temperature in Beijing on July 13?

Platform comparison

Market context

Beijing’s capital airport station will record its peak temperature for 13 July 2026, with the market resolving to the Celsius range containing that figure. Historical July climatology shows average highs near 31–32°C, while recent years have seen spikes to 35°C or higher, including a 40°C peak in July 2023 and a record 41.9°C on 24 July 1999[2][8]. The current crowd-implied probability of 0% YES for the lowest range contradicts Polymarket’s frontrunner outcome of 34°C at 44%, with 35°C at 39% as the next closest[1]. This divergence highlights how platforms like Kalshi, Betfair, and Smarkets often express odds as decimals rather than implied probabilities, and vary in fee structures and KYC requirements, affecting liquidity and pricing on weather events.

Traders should monitor the Beijing Meteorological Bureau’s daily forecasts and any heatwave advisories issued ahead of 13 July, as these directly influence temperature outcomes[10]. Recent news from Reuters noted Beijing bracing for blistering heatwaves returning to northern China in June 2023, with temperatures soaring past 41°C[3]. Such patterns suggest that sudden atmospheric shifts or humidity spikes could push highs into the 34–36°C range. On Polymarket, outcomes are priced as implied probabilities, whereas Kalshi uses decimal odds, and Betfair/Smarkets operate on a commission-based model with varying KYC thresholds. These structural differences can cause price discrepancies across books, especially on weather markets where data latency and resolution sources like Wunderground play a critical role[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Beijing on July 13? 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.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

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.