Highest temperature in Shanghai on June 29?

Platform comparison

Market context

The underlying real-world event is the highest temperature recorded on 29 June 2026 at Shanghai Pudong International Airport, measured in degrees Celsius. Polymarket prices this contract today with a 0% implied probability for the YES side, suggesting the crowd believes the temperature will not hit the specific threshold in question. This pricing reflects a market that has already absorbed recent weather data and historical patterns for late June in Shanghai.

Historically, daily high temperatures at Shanghai Pudong in June climb from 77°F to 83°F, rarely falling below 69°F or exceeding 92°F, with the hottest average day of the month occurring on 30 June at 29.7°C [1][6]. Given that the settlement window ends just before noon on 29 June, traders should note that peak afternoon heat often pushes temperatures toward the 25–30°C range on cloudy or rainy days, which is common in Shanghai’s humid season [4]. The current 0% probability may be overly conservative if the day turns unexpectedly clear and hot, as the historical ceiling for June is well above 28°C.

Key catalysts to watch include the official 24-hour forecast updates from AccuWeather, which currently project daily highs between 80° and 85°F for late June 2026, and any sudden shifts in the regional monsoon pattern that could suppress or amplify heat [3]. Traders must also monitor real-time Wunderground data for the Pudong station, as the market resolves strictly on the highest temperature recorded for all times on that day [market description]. A sudden drop in cloud cover or a surge in solar radiation could rapidly alter the outcome, making the next 10 hours critical for price discovery on the Polygon chain using USDC and conditional tokens.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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

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 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?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Scam? 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.