Highest temperature in Shanghai on June 29?

Platform comparison

Market context

The underlying real-world event hinges on the highest temperature recorded at Shanghai Pudong International Airport on 29 June 2026, where current crowd-implied probability sits at 0% for the "YES" outcome. Polymarket prices this contract today with near-total certainty that the peak temperature will fall outside the specific range being traded, reflecting a market consensus that the day will not reach the threshold required for a positive resolution. This pricing ignores abstract speculation and instead anchors firmly in the on-chain mechanics of USDC settlement on the Polygon network, where conditional tokens are being exchanged based on the Wunderground data feed that will ultimately determine the outcome.

Historical patterns for Shanghai in June show daily highs typically increasing from 77°F to 83°F (25°C to 28°C), rarely falling below 69°F (20°C) or exceeding the upper bounds of the summer heatwave [1]. Comparable Polymarket events, such as the 26 June highest temperature market, resolved decisively at 27°C with 100% certainty, suggesting that traders view the 29 June forecast as following a similar trajectory where extreme heat is unlikely to breach the specific range in question [3]. The current 0% probability aligns with these precedents, indicating that the market expects temperatures to remain within the standard June band rather than spike into the outlier territory required for a "YES" settlement.

Traders should monitor the 25% risk of thunderstorms forecast for 29 June, as cloud cover and precipitation typically suppress peak temperatures to the 24–25°C range [8]. The National Weather Service timeseries for ZSPD confirms that humidity and dew point fluctuations over the preceding 72 hours will be critical dependencies for the final temperature reading [4]. Recent forecasts from AccuWeather indicate daily highs for June 2026 ranging between 80°F and 85°F (27°C to 29°C), with overnight lows between 71°F and 78°F, reinforcing the expectation that the day will not exceed the threshold needed for a positive outcome [5]. Any sudden shift in the monsoon schedule or unexpected clear-sky conditions would be the primary catalyst to watch, though current data suggests stability in the prevailing humid, rainy season pattern [6].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Shanghai on June 29? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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 UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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 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 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.