Highest temperature in Shenzhen on August 9?

Platform comparison

Market context

Shenzhen’s highest temperature is trading against a notably hot early-August backdrop, with live weather services already showing readings around 37–38°C and intraday highs near 99–100°F as of the afternoon session. That makes the market’s 0% crowd-implied YES on the listed contract look detached from the broader temperature regime, especially since the settlement source is Weather Underground’s Daily Observations table rather than the summary high/low banner.[1][2][6][8]

Comparable August data point to Shenzhen often reaching the low-to-mid 30s Celsius, but the current platform consensus is materially firmer than the crowd price on this venue. Polymarket’s contract is heavily concentrated on 36°C, with its page describing roughly 98% on that exact outcome and only small residual weight on 37°C and 38°C, which is a large cross-platform divergence versus a zero-priced probability here.[3][14][15] Recent Weather Underground history for Shenzhen Bao’an International Airport also shows an 8/9/2026 high/low of 92°F/87°F, consistent with a warm day but not yet confirming the eventual peak for the full settlement window.[6]

Traders should watch the station’s later-day observations, because the winner is determined by the highest value logged in the Daily Observations table before the cutoff, not by forecasts or the headline summary. The main catalyst is whether afternoon convection or a late heat spike lifts the recorded maximum above the current running high; model-based and forecast pages have pointed to cloudy or thundery conditions with highs around 35–36°C, but those are informational rather than binding for resolution.[3][12][18] Any update from Weather Underground’s airport station after the final datapoint for the date will matter more than sportsbook-style forecast lines or summary-page highs.[6]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Shenzhen on August 9? 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 Kalshi vs Polymarket, 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 Kalshi vs Polymarket. 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.

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.

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.