Pronóstico: Highest temperature in Shanghai on August 8?

Platform comparison

Market context

Polymarket is pricing **0% YES** for a Shanghai high-temperature contract that settles in **USDC on Polygon** through conditional tokens, so the market is currently implying that the August 8 reading will not land in the winning temperature band. The resolution is tied to the **highest temperature in Weather Underground’s Daily Observations table** for Shanghai Pudong International Airport Station, not the Day High & Low summary, so traders need the intraday observation record rather than the headline summary if they are checking settlement risk. [4][9]

For context, Shanghai’s early-August climatology is firmly hot: published August averages cluster around the low 30s Celsius, with daily highs typically near **32–33°C** and lows in the mid-20s Celsius. Historical August records also leave room for a much hotter outlier, with several weather references putting Shanghai’s August record high around **40°C**, which means the range outcome is usually driven by how far the day pushes above the seasonal norm rather than by any unusual cold spell. [1][2][3][5]

The main catalysts a trader should watch are the station’s actual observed readings through the settlement window and any late-day warmth before the 12:00 UTC cutoff, because the market resolves from the recorded maximum in the relevant table. Weather Underground’s weekly history page already showed **93°F / 86°F** for 8/8/2026 at Shanghai, while the prior day reached **95°F / 82°F**, suggesting the contract’s outcome depends on whether the final daily observation tops the early reading or stays within the same broad hot range. [4]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Pronóstico: Highest temperature in Shanghai on August 8? 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 Polymarket Qué Es, 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 Polymarket Qué Es. 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.

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.