Highest temperature in Guangzhou on July 1?

Platform comparison

Market context

Guangzhou Baiyun International Airport will record its peak temperature for 1 July 2026, with the market resolving to the specific Celsius range containing that daily high. The current crowd-implied probability of 0% for the leading outcome appears starkly divergent from Polymarket’s pricing, where “35°C” holds a 38% frontrunner position and “36°C” sits at 25%[1]. This discrepancy highlights how platforms like Kalshi or Betfair, which often emphasise implied probability over decimal odds, may frame risk differently than Polymarket’s open-order-book model. Fee structures and KYC requirements also vary significantly; Kalshi demands strict US residency and identity verification, whereas Polymarket permits broader global access with lighter compliance, directly influencing liquidity depth and price discovery on this weather event.

Historical data frames the 0% probability as an outlier, given that July is Guangzhou’s hottest month, with average highs around 33°C and daily peaks rarely falling below 30°C[2][3]. The all-time record for 1 July specifically is 39.1°C, set in 2004, confirming that extreme heat on this date is not anomalous but documented[5]. Recent trends show China recorded its hottest month in history in July 2024, with temperatures averaging 23.21°C nationally, suggesting a warming baseline that supports higher local extremes[6]. Traders should monitor the China Meteorological Administration’s weekly heatwave advisories and the Guangdong Provincial Climate Centre’s seasonal forecasts, as these official schedules often precede public temperature spikes. A Reuters report from August 2024 noted sustained heat anomalies across southern China, reinforcing the likelihood of temperatures exceeding 35°C on 1 July 2026[6].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Guangzhou on July 1? 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

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.

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.