Highest temperature in Guangzhou on July 20?

Platform comparison

Market context

Guangzhou faces its peak summer heat on 20 July 2026, with the market betting on whether the highest temperature at Baiyun International Airport will exceed a specific threshold. The current 0% YES probability suggests the crowd expects the day to remain well below the target range, a stance that aligns with typical monsoon-influenced conditions where heavy rain and fog often suppress maximum temperatures.

Historical data for mid-July in Guangzhou shows average highs around 33–34°C, though extreme heatwaves have occasionally pushed readings above 37°C. However, the presence of light rain and fog reported today [1] mirrors patterns from previous years where cloud cover and precipitation prevented temperatures from reaching critical highs. This weather behaviour frames the 0% probability as a rational assessment rather than an outlier, given the region’s reliance on seasonal rainfall to moderate summer extremes.

Traders should monitor real-time updates from Wunderground, the official resolution source, for any sudden shifts in temperature trends before the 12:00 UTC settlement window closes. While no political debates or campaign disclosures directly influence weather, unexpected atmospheric changes—such as a breakdown in the monsoon trough or a surge in subtropical high pressure—could act as catalysts. Recent meteorological reports from China’s National Meteorological Centre indicate stable monsoon activity, reinforcing the likelihood of continued cloud cover and limiting the chance of a heat spike [1].

Sources: 1

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 20? 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

How accurate are political prediction markets?

Historically more accurate than polls. Polymarket's Brier score on US 2024 elections was ~0.11 — better than 538 (~0.14) and every mainstream poll. Markets aggregate information with real skin in the game.

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.

Which platform has the deepest political liquidity?

Polymarket — by far. US 2024 presidential volume was ~$3.5B vs Kalshi (~$200M) and Betfair (~$120M). Where Polymarket is geo-blocked, brokers like Trump Prediction route into the same order book at 0% fees.

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.

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.