Highest temperature in Guangzhou on July 21?

Platform comparison

Market context

Guangzhou faces its peak summer heat today as the city approaches the annual high-temperature threshold for 21 July 2026, with the market currently pricing a 0% chance of any outcome other than the implied range. The settlement hinges on the recorded maximum at Guangzhou Baiyun International Airport Station, sourced from Wunderground, where historical July data consistently shows highs between 31°C and 32°C.

Historical climate records frame the current 0% probability as a mispricing, given that July in Guangzhou typically delivers highs of 32°C (90°F) with average humidity at 82%, creating muggy, hot conditions[4]. Past weather patterns indicate that temperatures rarely dip below 31°C during this period, making the market’s zero-probability stance on alternative ranges inconsistent with the region’s established thermal baseline for mid-summer[4].

Traders should monitor real-time meteorological updates from AccuWeather, which currently reports cloudy skies with a temperature of 82°F (28°C) and a RealFeel of 96°F due to 92% humidity[2]. While no political debates or campaign disclosures influence this weather event, the primary catalyst remains the daily Wunderground temperature log at 12:00 UTC, which will definitively settle the market based on the station’s recorded peak[1].

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 21? 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.

Can prediction markets influence election outcomes?

Markets reflect expectations rather than create them. Studies show public-facing markets can anchor expectations, but don't influence the underlying outcome. Political markets are information, not advocacy.

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.

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.

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.