Highest temperature in Guangzhou on July 31?

Platform comparison

Market context

Guangzhou’s hottest reading on 31 July will hinge on whether the city delivers a typical late-July peak rather than an outlier. The current 0% crowd-implied YES price is notably low against the climatology: July in Guangzhou normally runs around 32–33°C for daily highs, with WeatherSpark putting typical highs near 91°F and only rarely outside the mid-80s to mid-90s Fahrenheit range, while WeatherAPI’s July averages show about 33°C/91°F. That makes any market bucket tied to a warm-but-not-extreme high temperature the natural base case, and a zero line implies the market is leaning heavily on either an expected cooler day, a late-formed rain shield, or simple illiquidity rather than on normal seasonal odds.[3][4]

Recent history supports that framing. Timeanddate’s Guangzhou history shows a maximum of 95°F on the previous day and a 102°F high within the last two weeks, so the market is not pricing against a permanently cool regime; instead, it is reacting to how quickly the day can overperform once sun breaks through.[1] More broadly, July in Guangzhou is persistently muggy and rain-affected, but still capable of mid-30s Celsius highs, with TravelChinaGuide showing recent July highs above 34°C on multiple dates and WeatherSpark noting muggy conditions are essentially constant through the month.[3][13] Against that backdrop, sportsbook-style weather lines would normally sit well above a 0% implied chance for a hot-day outcome, so any divergence here looks more like contract-specific pricing noise than a strong cross-platform consensus.

For traders, the key catalysts are the morning-to-midday forecast updates, the timing of showers or thunderstorms, and whether cloud cover persists long enough to cap the afternoon high before the market’s settlement window closes at 12:00 UTC. The resolution source is the Guangzhou Baiyun International Airport Station page on Wunderground, so local station observations matter more than broader city forecasts, especially if airport conditions differ from downtown heat. The main dependency is therefore the hourly evolution of cloud, rain, and wind rather than any scheduled announcement; in weather markets, that leaves the final high especially sensitive to the last few hours of insolation before the daily maximum is set.[5]

Sources: 1 · 2 · 3 · 4 · 5

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 Kalshi vs Polymarket, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Kalshi vs Polymarket. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 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.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.