Highest temperature in Guangzhou on August 15?

Platform comparison

Market context

Guangzhou will experience peak summer heat on 15 August 2026, with the settlement hinging on the highest temperature recorded at Baiyun International Airport's meteorological station that day. The market resolves using Weather Underground's Daily Observations table rather than the summary high-low figures, a distinction that matters when automated systems or manual transcription produce minor discrepancies. Current crowd pricing at 0% YES suggests traders are either heavily concentrated in lower temperature bins or the market structure itself has created a coordination problem around which specific range will resolve.

Guangzhou's August climate is remarkably consistent. Historical data from the past two decades shows daily highs clustering between 32–36°C during mid-August, with extremes rarely exceeding 37°C even during heat waves. The 0% probability on this particular market likely reflects either extreme confidence in a specific temperature band (suggesting traders have already committed capital elsewhere) or thin liquidity that hasn't yet attracted comparative traders across Polymarket, Kalshi, Betfair, and Smarkets. Kalshi's regulatory constraints in the US and Betfair's decimal odds presentation versus Polymarket's binary structure mean pricing can diverge substantially on weather markets where international participation varies.

Traders should monitor tropical cyclone activity in the South China Sea during early August 2026, as systems tracking toward the Pearl River Delta can suppress temperatures by 2–4°C through cloud cover and moisture. The China Meteorological Administration typically issues seasonal forecasts in July; any revision toward above-normal heat would signal upside pressure on higher temperature ranges. Weather Underground's data feed occasionally experiences brief delays during extreme events, though historical resolution disputes on this platform have been rare.

Methodology

This page compares Highest temperature in Guangzhou on August 15? 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.

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.

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.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Robinhood Prediction Markets 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.