Highest temperature in Guangzhou on August 10?

Platform comparison

Market context

Guangzhou’s peak temperature on 10 August will be set by the highest reading at Guangzhou Baiyun International Airport Station, not the headline “day high” summary, so traders need to watch the intraday observations rather than a single forecast figure. As of early morning, the station-based Weather Underground page showed 97°F/83°F and “today’s temperature is forecast to be cooler than yesterday”, while broader local forecasts still pointed to a hot day around 36–38°C, which is consistent with Guangzhou’s humid August climate and leaves the exact bucket sensitive to afternoon heating and cloud cover.[5][15][17]

That is why the current 0% YES on a platform like Kalshi is less informative than the price formatting itself: Kalshi-style contracts express an implied probability, while Polymarket and Betfair typically trade around decimal odds, and Smarkets charges commission rather than embedding it in the spread. For this sort of weather market, small differences in resolution rules matter more than model precision, because the source is a station observation table and the highest value can come from a single update window rather than the all-day forecast. Comparable August Guangzhou forecasts usually cluster in the low-to-mid 30s Celsius, with historical guides putting typical highs around 33–34°C, so the main disagreement is usually between a 35°C and 36°C outcome rather than any extreme breakaway.[13][14][17]

The main catalysts are the day’s cloud breaks, rainfall timing, and whether the airport station logs a late-afternoon spike before the settlement window closes. Weather Underground’s live station page updates through the day, and that matters more than the static forecast because the market resolves off the recorded maximum in the Daily Observations table, with revisions only relevant until the next day’s first datapoint is published under Polymarket’s rule set.[5][15] On exchange access, Betfair and Smarkets generally require broader KYC coverage than most crypto-native prediction platforms, while fees also differ materially, so traders comparing books should separate the view on temperature from the cost of expressing it.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Guangzhou on August 10? 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

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

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.

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.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi 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.