Highest temperature in Shanghai on June 27?

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Market context

The underlying event is the daily peak temperature at Shanghai Pudong International Airport on 27 June 2026, a date historically prone to extreme heat spikes as the plum rain season transitions into summer. Current crowd-implied probability of 0% for any specific high range suggests traders are betting against a record-breaking day, yet climate data indicates late June often sees daytime highs reaching 30°C (86°F) with spikes of 38°C (100°F) possible, as witnessed on 27 June in previous years[8]. Historical averages for June show daily highs typically ranging from 27°C to 35°C (81–95°F) on sunny days, while frequent rainfall usually keeps temperatures lower, hovering around 25–30°C (77–86°F)[3]. The 0% probability may reflect an overreaction to recent cloudy forecasts, ignoring the statistical likelihood of a sudden heatwave given the seasonal trend of increasing daily highs by 7°F throughout the month[1].

Traders must monitor real-time weather announcements and cloud cover schedules, as a shift from rainy to sunny conditions could instantly trigger a temperature spike. Recent forecasts for June 2026 show daily highs ranging from 80° to 86°F (27–30°C), with overnight lows between 69° and 77°F, but these figures are highly dependent on solar radiation, which is gradually decreasing in June yet remains significant enough to drive peaks above 30°C on clear days[2]. The primary catalyst is the presence or absence of the plum rain; if rainfall ceases before midday, the lack of moisture will allow temperatures to climb rapidly toward the 35°C upper limit observed on sunny days[3]. No key absences or coaching changes apply here, but the dependency on Wunderground’s hourly data means any gap in reporting could obscure the true peak, making live satellite feeds of cloud movement essential for accurate positioning[8].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Sport Prediction, 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?

On Sport Prediction, 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.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does it cost to trade on Sport Prediction?

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

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Sport Prediction triggers a quick verification flow that finishes in 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.