Pronóstico: Highest temperature in Shanghai on July 20?

Platform comparison

Market context

Shanghai is currently experiencing mostly cloudy conditions with a high chance of local thunderstorms and a 70% precipitation probability at the Pudong International Airport Station, which directly suppresses the likelihood of extreme heat on 20 July 2026 [1]. This active weather pattern explains the crowd-implied probability of 0% for the YES outcome, as rain and cloud cover typically cap maximum temperatures well below the thresholds required for the upper resolution ranges in this market.

Historically, July in Shanghai often sees temperatures between 28°C and 34°C, but days with significant thunderstorm activity rarely exceed 32°C, making the current 0% pricing a rational reflection of the immediate atmospheric instability [1]. Traders on Polymarket should monitor the on-chain liquidity for USDC pairs on Polygon, where conditional tokens for the lower temperature ranges are likely accumulating volume as the settlement window approaches 2026-07-20T12:00:00Z. The Wunderground resolution source will confirm the exact peak, but the current meteorological forecast suggests the highest temperature will fall into the lower brackets rather than the extreme ranges.

Key catalysts include the real-time updates from Meteoblue regarding the afternoon mixture of sunshine and clouds, which could briefly spike temperatures if the thunderstorms delay [1]. Traders must watch for any sudden shifts in wind direction from the South to Southwest, as these changes influence the intensity of the precipitation and the potential for a late-day heat spike before the 12:00 UTC settlement cutoff. No major announcements or schedules are pending that would alter the local climate, leaving the natural weather cycle as the sole determinant for the market resolution.

Sources: 1 · 2 · 3

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

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.

Do I need to KYC for this market?

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