Highest temperature in Shanghai on June 21?

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Market context

Shanghai’s highest reading at Pudong airport on 21 June will depend on how quickly early summer heat builds under a monsoon-influenced coastal climate. June averages at Shanghai Pudong International Airport are already in the low 30s Celsius on warmer days, with WeatherSpark showing daily highs in June typically rising towards 83°F/28°C and occasionally reaching the low 90s Fahrenheit, while airport climate guides note that summer highs above 30°C are common.[2][3]

That makes a 0% crowd-implied chance of a given outcome range best read as a statement about the current book rather than the weather itself. Recent conditions around Shanghai have included thundery showers and a forecast high of 28°C at Hongqiao, which would usually keep the day’s airport maximum below the hotter summer ranges, but airport-level outcomes can move sharply if sunshine breaks through or if showers arrive early and suppress the afternoon peak.[1] For comparison, Shanghai has also seen much hotter episodes, including reported readings above 40°C in recent heatwaves, showing that the city can support extremes well beyond its June average.[6]

For traders, the main catalysts are the official airport observations used by the resolver, plus any late-morning shift in cloud, rain, or thunder near Pudong that changes the day’s maximum before the settlement window closes. Because the source is Wunderground’s Shanghai Pudong International Airport history page, the key dependency is the final recorded daily high at that station rather than a citywide forecast.[2] On accessibility and compliance, a market of this sort can sit within Germany’s GlüStV gambling framework if offered to German users, while US CFTC reach matters because event-based markets may still draw regulatory scrutiny depending on venue structure and participant location; “no-KYC up to $1,500” generally means light-touch onboarding for small balances, but it does not remove identity checks once higher thresholds, AML flags, or jurisdictional restrictions apply.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Shanghai on June 21? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Polymarket Tax UK — the application we operate, where you trade directly against 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

Where can I trade this market with the lowest fees?

On Polymarket Tax UK, which mirrors the Polymarket order book at 0% fees. 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 it cost to trade on Polymarket Tax UK?

Zero. Polymarket Tax UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Tax UK triggers a quick verification flow that finishes in minutes.