Highest temperature in Guangzhou on July 9?

Platform comparison

Market context

On 9 July 2026, the highest temperature recorded at Guangzhou Baiyun International Airport will determine the outcome of a prediction market where the crowd currently assigns zero probability to any “YES” result. This event hinges on a single daily peak reading, sourced from Wunderground, and reflects the intense summer heat typical of southern China’s Guangdong province.

Historically, early July in Guangzhou sees daily highs clustered between 31°C and 34°C, with average highs reaching 33°C (91°F) by mid-month [1][4]. The city recently experienced its longest summer since 1961, with July’s average temperature hitting 23.3°C—the highest since records began [2][6]. Such data suggests that a 0% implied probability is likely mispriced, as even conservative models anticipate temperatures well above 30°C. Traders comparing platforms like Polymarket, Kalshi, and Betfair should note that while Polymarket uses decimal odds, Kalshi and Betfair rely on implied probabilities, and fee structures and KYC requirements vary significantly across these books.

Traders should monitor the China Meteorological Administration’s daily forecasts and any regional heatwave advisories issued ahead of 9 July [4]. Recent reports confirm that Guangzhou has already broken a three-decade heat record, with summer days measured by temperature reaching 235 [8]. As heatwaves continue across southern China, the likelihood of extreme highs increases. Platform users must also consider settlement timing: Kalshi settles at 12:00 UTC, while Polymarket may delay resolution depending on data availability. These operational divergences can affect trade execution and risk management.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Guangzhou 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 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.

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.

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.

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.