Highest temperature in Beijing on July 9?

Platform comparison

Market context

Beijing on 9 July 2026 will see its peak daytime temperature recorded at the Capital International Airport Station, with the market resolving to the Celsius range containing that highest value. Long-term averages place typical July highs at 31°C, though historical extremes have reached 38°C to 40°C, with the hottest month coinciding with the rainy season and frequent thunderstorms [1][2][5]. The current crowd-implied probability of 0% for the highest range suggests traders believe temperatures will stay well below record-breaking levels, a stance consistent with comparable cases where morning cloud cover or convective systems capped peak heat in similar cities like Shanghai [8].

Traders should monitor the timing of the rainy season, which typically intensifies between 20–30 July, and watch for any official heat advisories that might signal extreme conditions [2][9]. Recent authorities have urged people to limit outdoor time after temperatures soared to 41.1°C, indicating the potential for sudden spikes if atmospheric conditions shift [9]. Platform comparisons reveal key divergences: Polymarket and Betfair often use decimal odds while Kalshi and Smarkets emphasise implied probability, and fee structures vary significantly, with some platforms requiring KYC that others do not. These differences affect liquidity and pricing efficiency for this specific weather event, where the resolution source is Wunderground’s daily history for the airport station.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Beijing on July 9? 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 Kalshi Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

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.

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. Kalshi 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.