Highest temperature in Guangzhou on August 1?

Platform comparison

Market context

Guangzhou’s airport temperature on 1 August is usually driven by peak daytime heat rather than overnight conditions, because the settlement depends on the **highest** reading at Baiyun International Airport Station during the full day. August norms for Guangzhou are already high: average daily highs cluster around 32–33°C, with typical humidity and heavy rain, and some climate sources show historical August extremes reaching the mid-to-high 30s°C[1][4][18][20]. In that context, a crowd price of **0% YES** looks detached from the city’s seasonal baseline, unless traders are effectively discounting access to the specific Wunderground station reading rather than the weather itself[12].

For comparison across venues, Kalshi-style markets usually quote **implied probability** directly, while Betfair and Smarkets expose the same view through **decimal odds** that embed the commission, so a low price can mean something different once fees are added. On a weather contract like this, the key practical issue is settlement source: Wunderground’s airport station history is the reference, not a city-wide average, so a warm-but-ordinary Guangzhou day can still resolve higher or lower than traders expect if airport conditions diverge from broader forecasts[12]. Platform access also differs materially: some books require stricter KYC and have narrower jurisdictional reach, which can suppress participation and leave prices more vulnerable to thin-liquidity swings.

The main catalysts are the short-term forecast revisions for Guangzhou, especially any shift in cloud cover, rain bands, or tropical moisture over the Pearl River Delta, because these determine whether the airport reaches its daily maximum early, late, or not at all. By settlement time, traders will mostly be watching the Wunderground station page for the day’s recorded high rather than headline city forecasts, since a single hot afternoon spike can decide the range bucket. Forecasters currently point to August highs around 89–93°F, with overnight lows near 74–80°F, which keeps the market sensitive to even modest revisions in convective rain risk and heat build-up[9][10].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Guangzhou on August 1? 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

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. 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.