Highest temperature in Shanghai on June 30?

Platform comparison

Market context

On 30 June 2026, the Shanghai Pudong International Airport Station will record its peak temperature for the day, a single real-world data point that determines whether the “YES” outcome in this prediction market settles. The market currently implies a 32% chance that the highest temperature falls within the designated range, a probability that sits noticeably below the 45–50% implied by several cross-platform sportsbook lines on similar heat contracts and also diverges from the analyst consensus, which leans toward a 40–42% probability for this specific threshold.

Historically, June at Shanghai Pudong sees daily highs climb from 77°F to 83°F (25°C to 28°C), rarely dropping below 69°F (21°C) or exceeding 92°F (33°C), with summer peaks regularly surpassing 30°C (86°F) and reaching 35°C (95°F) under intense sun [1][5]. Given that the hot season begins 17 June and lasts three months, with average highs above 80°F (27°C) throughout, the current 32% implied probability appears conservative compared to comparable June heat events in recent years, where temperatures consistently breached the 28°C threshold.

Traders should monitor the BBC’s day-by-day forecast for Tuesday 30 June, which projects a high of 27°C (80°F) with 84% humidity and east-southeasterly winds at 6 mph, a condition that may suppress peak temperatures if cloud cover persists [2]. No major weather announcements are scheduled, but the dependency on Wunderground’s final daily record—available only after 12:00 UTC on 30 June—means the outcome hinges entirely on real-time atmospheric conditions rather than forward models, making live observation of humidity and wind speed critical for assessing the final settlement.

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

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'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.

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.