Highest temperature in Guangzhou on July 4?

Platform comparison

Market context

Guangzhou Baiyun International Airport will record its peak temperature on 4 July 2026, with the market resolving to the Celsius range containing that figure. Historical July data frames the current 0% implied probability for lower ranges as statistically sound; daily highs typically hover around 33°C to 35°C, rarely dipping below 30°C or exceeding 36°C [2][4]. Polymarket’s leading outcome sits at 30°C with a 39% probability, while Kalshi and Betfair often diverge by quoting decimal odds rather than implied probabilities, altering how traders assess this specific heat event [1][3].

Traders must monitor the China Meteorological Administration’s real-time forecasts and any sudden shifts in monsoon patterns that could suppress peak temperatures, as Guangzhou experienced its longest summer since 1961 recently, suggesting elevated baseline heat [8]. Fee structures and KYC requirements further distinguish platforms; Polymarket offers lower fees with minimal identity checks compared to Kalshi’s strict US residency rules, impacting liquidity depth for this weather contract [1]. The settlement window closes at 12:00 UTC on 4 July, requiring precise timing to capture the final Wunderground reading [1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Guangzhou on July 4? 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

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

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.

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.

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. 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.