Highest temperature in Shenzhen on August 2?

Platform comparison

Market context

Polymarket currently prices this contract at **0% YES**, so the market is effectively saying the airport’s highest reading on 2 August will not land in the specified top range. On Polymarket, the trade is settled in **USDC** on **Polygon**, with outcome exposure represented by conditional tokens, so the price is the market’s live read on where the final Wunderground-backed print will fall rather than a direct forecast of whether Shenzhen feels hot in the abstract.

For context, Shenzhen’s August climate is typically hot enough that the day’s maximum often sits around the low 30s Celsius, with average August highs near **32°C** and record highs in the upper 30s or low 40s depending on the dataset used.[4][7][8] That matters because this market resolves to the **single highest temperature recorded at Shenzhen Bao’an International Airport Station** during the day, not the daily average, so a brief afternoon spike can matter more than the overall weather pattern.[16] Similar August weather references for Shenzhen show frequent highs around **89–90°F** and occasional much hotter outliers, which is the key framing for reading a zero-priced contract.[1][6][15]

For a trader, the main things to watch are the local forecast for **afternoon convective heat**, cloud cover, and any **thunderstorm or typhoon-related rain bands** that could cap the peak before the daily cutoff.[19] The relevant settlement source is Wunderground’s history page for Shenzhen Bao’an International Airport Station, so the practical dependency is whether the airport observation line records a late-day maximum before **12:00 UTC**; in other words, the live price will move on whether the meteorological setup supports an isolated high reading, not just a warm average day.[16]

Sources: 1 · 2 · 3 · 4 · 5

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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

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.

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.