Highest temperature in Shenzhen on July 24?

Platform comparison

Market context

Shenzhen’s **highest temperature** for 24 July will be measured at Shenzhen Bao’an International Airport Station, and the market resolves on the day’s peak reading in Celsius rather than an all-city average. July is normally a hot, humid month there, with guide data putting the typical daytime high at about **32°C** and the month sitting inside the main rainy season, which tends to keep temperatures elevated even as cloud and showers can cap extremes.[1][2]

Against that backdrop, a **0% YES** crowd-implied price looks like a sharp underread only if traders are effectively saying the day will miss the contract’s target range by a wide margin. Historical climate framing suggests the more common outcome is a high in the low 30s, so the relevant comparison is less about an exact forecast and more about whether the airport observation briefly touches a hotter band during a dry, sunny window.[1][2] In prediction-market terms, that leaves the contract materially more sensitive to intraday weather than to the monthly average.

The key catalysts are the **local forecast**, timing of any **afternoon convective rain**, and whether sea-breeze or cloud cover suppresses the station’s maximum before the settlement window closes. No sportsbook-style line is typically available for a single airport temperature reading, so the cleanest cross-platform read is between the market price and near-term weather consensus; when those diverge, it is usually because traders are weighting an extreme heat spike or a rain-cooled ceiling differently from mainstream forecasts.

Sources: 1 · 2

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

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.

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.

Do I need to KYC for this market?

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