Highest temperature in Shanghai on August 4?

Platform comparison

Market context

Shanghai is running hot again, with the latest short-range forecasts pointing to a high in the low-to-mid 30s Celsius and only limited rain risk around the day itself. AccuWeather’s August outlook for Shanghai shows daily highs broadly between 82°F and 92°F, while day-specific feeds for 4 August cluster around 33–34°C, which is consistent with a warm late-summer setup rather than an outlier cool day.[1][2][3]

That matters because the market resolves to the *single highest* temperature at Shanghai Pudong International Airport Station, not the citywide average. For early August, comparable forecasts and monthly climate guides put Shanghai in its hottest seasonal window, with typical daytime highs around 30–32°C and frequent humidity-driven heat; several August reference pages also note occasional spikes into the mid-to-high 30s, so the distribution is skewed towards a value comfortably above the low 30s rather than near the teens or twenties.[4][5][8][16] On that basis, a 0% yes price looks like a stale or mispriced read unless the relevant airport station ends up materially cooler than nearby forecasts suggest.

The key trader watchpoints are the local convective forecast, any thunderstorm or rain-band shifts, and whether the airport station records a brief early-afternoon peak before cloud cover or precipitation arrives. Shanghai’s August rainfall is often episodic and can be driven by showers or typhoon-related systems, which can quickly cap maximum temperatures even when the morning starts hot.[3][13] The settlement clock runs to 12:00 UTC, so the Asian daytime heating window is decisive; if forecast highs firm up closer to 35–37°C, the upper temperature bands become much more likely, while sustained cloud or rain would pull the result back towards the lower bands.[2][6][17]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Shanghai on August 4? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Prediction Today, which mirrors the Polymarket order book at 0% fees.

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

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.

Do I need to KYC for this market?

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