Highest temperature in Shanghai on July 5?

Platform comparison

Market context

The 0% YES probability for a high temperature below 30°C in Shanghai on 5 July 2026 reflects a sudden shift in the last 48 hours, where forecast models converged on a hot, humid start to the month. Current data indicates daily highs will range from 30°C to 38°C, with extremes potentially reaching 40°C, making a sub-30°C reading virtually impossible for this date [1][4]. The market is effectively pricing in the certainty that Shanghai’s July heatwave has already begun, with overnight lows staying above 24°C and daytime temperatures consistently exceeding the threshold [2][8].

Historically, early July in Shanghai is comparable to August in intensity, with 7–15 days per month typically exceeding 35°C [4][5]. In July 2025, the peak temperature reached 38°C, reinforcing that a sub-30°C high is an outlier event that rarely occurs in the first ten days of the month [5][8]. The 0% probability aligns with these comparable cases, as the climate data shows the warmest days in July usually occur around 29 July, while 3 July is the coldest, yet still well above 24°C [2][8].

Traders should monitor the Shanghai Meteorological Bureau’s daily updates for any sudden shifts in cloud cover or precipitation, which could temporarily moderate temperatures, though such events are unlikely to drop highs below 30°C [3]. The key dependency is the persistence of the eastward wind flow and solar energy levels, which are gradually increasing through July, pushing temperatures upward [2]. Recent forecasts for Sunday show a 60% chance of local thunderstorms and temperatures peaking at 31°C, suggesting that even with rain, the high will remain above the threshold [3][9]. No major announcements are expected to alter this trajectory before the settlement window closes on 5 July 2026.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Prediction Today. 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.

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.