Highest temperature in Shanghai on July 6?

Platform comparison

Market context

The underlying event is the highest temperature recorded on 6 July 2026 at Shanghai Pudong International Airport, measured in degrees Celsius. Polymarket prices this contract today at a 0% YES probability, implying the market believes the temperature will not fall within the specified range. This near-zero pricing is stark when weighed against historical patterns: July is Shanghai’s hottest month, with average highs reaching 30°C (86°F) and frequently exceeding 35°C (95°F) during sunny spells[4][5]. Current early-morning readings already show 26°C (79°F) with 100% humidity, suggesting a warm day ahead[2]. Such conditions make a 0% probability highly questionable unless the range is set impossibly high.

Traders should monitor real-time updates from Wunderground, the official resolution source, and watch for any sudden shifts in weather forecasts or local meteorological announcements. The Shanghai Meteorological Bureau typically issues daily heat advisories when temperatures approach 35°C, which could serve as a catalyst for price movement if the market range is near that threshold[3]. Additionally, the on-chain mechanics—conditional tokens settled in USDC on Polygon—mean liquidity can shift rapidly once new data arrives. With the settlement window closing at 12:00 UTC on 6 July, any late-morning spike in temperature could trigger a sharp repricing, especially if the current range is conservative.

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 PolyGram. 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 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.

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.