Highest temperature in Guangzhou on July 23?

Platform comparison

Market context

Guangzhou’s official airport reading will be judged by the day’s peak temperature, so the key question is whether the city can climb into the mid-30s Celsius before the noon UTC settlement cut-off. Current conditions already point to heat stress: AccuWeather has Guangzhou at 91°F with a RealFeel® of 109°F, which is consistent with a hot, humid air mass that can still produce a higher observed maximum later in the morning local time.[1]

The market’s 0% yes price is sharply out of line with the broader weather picture and with Polymarket’s own ladder, where 36°C is the frontrunner at 47% and 35°C is next at 28%.[2] That makes the implied distribution look centred on a high-30s-adjacent outcome rather than a sub-threshold miss, and it also highlights a meaningful gap between the crowd price on the contract and the platform’s outcome-level odds.[2] Seasonal context also matters: Guangzhou’s July–August period is typically its hottest stretch, with high heat, humidity and rain all common, which tends to support elevated daytime maxima rather than cool readings.[3]

What traders should watch is the morning evolution of cloud cover, rainfall and humidity at Baiyun Airport, because short-lived sun breaks can lift the official high even if conditions later deteriorate. For this contract, any convective showers or an early sea-breeze turn would matter less if the peak has already been set, but a slower warming trend would leave the market exposed to a higher top reading before the resolution window closes.

Sources: 1 · 2 · 3

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.