Highest temperature in Guangzhou on July 20?

Platform comparison

Market context

Guangzhou’s subtropical monsoon climate delivers long, hot, and humid summers, with July representing the peak of seasonal heat. Historical data shows typical July highs around 32–34°C, while the highest recorded temperature in the month has exceeded 35°C [1][2][3]. The current 0% implied probability for any specific range on 20 July 2026 appears inconsistent with this baseline, suggesting either a mispricing or an unusually narrow market definition that excludes plausible outcomes.

Comparable cases from recent years show July temperatures frequently reaching 33–35°C at the Baiyun International Airport station, with thunderstorms and typhoon influences possible but not dominant in mid-July [1][4]. Traders should monitor the China Meteorological Administration’s daily forecasts and Wunderground’s real-time updates for the Baiyun station, as these directly determine settlement [1]. No major announcements are expected, but typhoon tracks in the South China Sea could shift temperatures if a system approaches Guangdong in the coming days [1].

On platform mechanics, Polymarket displays decimal odds while Kalshi, Betfair, and Smarkets use implied probability or fractional pricing, affecting how the 0% figure is interpreted. Fee structures also diverge: Polymarket charges no trading fees but has withdrawal costs, whereas Kalshi applies a small fee per trade and requires KYC, unlike Betfair’s open-access model. These differences shape liquidity and pricing efficiency on weather markets like this one, where historical volatility is moderate but settlement hinges on a single sensor reading.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Guangzhou on July 20? 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 UK, 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. Kalshi Alternative UK 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. Kalshi Alternative UK 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.