Highest temperature in Shenzhen on July 19?

Platform comparison

Market context

Shenzhen's climate during mid-July typically sees peak summer heat, with daily highs regularly exceeding 32°C. The city's subtropical monsoon pattern brings consistent warmth and humidity throughout this period, though occasional tropical systems can introduce variability. Historical data from Bao'an International Airport Station—the official settlement source—shows July temperatures frequently clustering in the 33–35°C range, with occasional excursions above 36°C during particularly intense heat waves.

The 0% crowd probability currently reflected in this market suggests traders are either awaiting clearer seasonal forecasts or treating the outcome as highly uncertain across multiple temperature bands. Comparable weather markets on prediction platforms typically show wider probability distributions for specific temperature ranges rather than consensus clustering, particularly when settlement depends on a single meteorological station's readings rather than regional averages. The six-month lead time until the July 2026 settlement window means near-term weather models carry limited predictive value; seasonal outlooks from meteorological services will become more reliable from April onwards.

Traders should monitor tropical cyclone activity in the Western Pacific during June and early July, as systems tracking towards southern China can suppress temperatures through cloud cover and rainfall. The China Meteorological Administration's monthly forecasts, updated regularly, will provide the most actionable guidance on whether 2026 July conditions align with historical norms or deviate significantly. El Niño or La Niña conditions developing through 2025–2026 could also influence regional temperature patterns, though their effects remain probabilistic at this distance.

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

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

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.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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 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.