Highest temperature in Guangzhou on July 27?

Platform comparison

Market context

Guangzhou’s airport station is heading into a very hot day, with forecast highs around 37°C and limited rainfall risk in the immediate outlook. Weather Atlas says the hottest stretch is Friday through Sunday, with maximums of 37°C, before easing only slightly afterwards, which keeps the market centred on whether the day’s peak lands in the top temperature bands rather than the mid-30s.[1]

For comparison, Guangzhou’s late-July heat normally clusters in the upper 20s to upper 30s, so a reading close to 37°C would be firmly on the warm end of the local range rather than an outlier. That is why the current 0% implied YES looks more like a stale price than a meaningful view of the meteorology: the relevant question is not whether it will be hot, but whether Baiyun Airport reaches the specific band needed for settlement.[1][3]

The main catalyst to watch is the intraday temperature trace from Wunderground for Guangzhou Baiyun International Airport, since the market resolves on the *highest* recorded temperature at that station during the settlement window. The immediate driver is the strength of daytime heating versus any cloud or drizzle suppressing the afternoon peak; AccuWeather and BBC both show warm, humid conditions already in place, which supports the idea that the settlement outcome will hinge on the exact midday-to-afternoon maximum rather than a broader daily average.[3][4]

Sources: 1 · 2 · 3 · 4

Methodology

Political prediction markets differ structurally from sports betting: thinner liquidity, longer settlement windows, higher sensitivity to single news events. This page shows the live Polymarket quote for Highest temperature in Guangzhou on July 27? plus platform attributes for the three reference venues, so you can see at a glance where the deepest market for this question sits.

Resolution & payout

Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.

Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.

FAQ

What resolution source is used for elections?

Polymarket defines the source per contract — usually Associated Press (AP Race Call), Reuters or the official electoral commission. The source is stated in contract details before the market opens.

How fast do political markets react to news?

High-liquidity markets move within seconds to minutes. A Trump tweet on the economy can shift the "Trump 2024" market 2-5 points before mainstream media has written anything.

Are political prediction markets legal in my country?

It varies. They sit in legal gray areas in most jurisdictions. Polymarket is geo-blocked from US/UK/EU; some broker frontends have a different geo footprint. Trade only with capital you can afford to lose, and only if you understand the legal status in your jurisdiction.

Why do Polymarket and Kalshi differ on elections?

Kalshi must follow CFTC compliance — strict definitions, clear resolution sources, US citizens only with KYC. Polymarket operates globally without CFTC oversight — deeper liquidity, but also higher regulatory risk.

Which political events have the biggest volume?

US Presidential election, party nominations (DNC/RNC), Senate majorities, individual state outcomes (Pennsylvania, Michigan, Wisconsin), and major European elections. Peak markets reach $50-500M per event.