Highest temperature in Shanghai on August 3?

Platform comparison

Market context

The key real-world event is the **highest temperature recorded at Shanghai Pudong International Airport on 3 August 2026**, and the market settles on the temperature band containing that observation from Wunderground. Early pricing at a **0% YES** implied probability is only useful as a blunt signal that the contract is being treated as a long-shot or thinly traded line, not as a forecast of the day’s actual heat. By contrast, public weather outlooks for Shanghai in August cluster around the low- to mid-30s Celsius, with AccuWeather’s monthly view showing daily highs of roughly 82°F to 92°F and other August guides pointing to around 31°C to 35°C for the month. [1][12][18]

Comparable cases suggest the market should be read against Shanghai’s persistent summer humidity rather than against a single average high. Wunderground-style airport observations can run hotter than citywide monthly normals, while the airport’s coastal setting also leaves room for cloud cover, rain bands or thunder to cap the peak. Recent regional forecasts have already shown Shanghai in the high-20s to high-30s Celsius range, including a Hong Kong government bulletin from 2 August calling for Shanghai to reach **29°C to 37°C** and other day-specific forecasts around **34°C to 35°C**. [7][2][4] That is materially above a zero-implied price, but still leaves a wide distribution across the contract’s Celsius bands.

Traders should watch the overnight and morning forecast updates for rain, thunderstorms and typhoon-related changes, because these are the main drivers of whether the day’s maximum lands near the low 30s or pushes into the upper 30s. The settlement window closes at **12:00 UTC**, so any late-morning clearing or convective burst matters less than the early-day evolution around local midday. On a cross-platform basis, the sportsbook-style line is effectively absent here, so the main comparison is between the prediction market’s near-zero price, broader analyst-style weather ranges, and the live airport forecast path into the morning.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Shanghai on August 3? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi vs Polymarket, which mirrors the Polymarket order book at 0% fees.

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

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 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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi vs Polymarket trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.