Highest temperature in Shenzhen on August 9?

Platform comparison

Market context

Polymarket is pricing this Shenzhen heat contract at **0% YES** right now, so the market is effectively saying the listed temperature band will not resolve as the winning range. For a user holding USDC on Polygon, that means the key question is not whether Shenzhen is hot in the abstract, but whether the **highest reading at Shenzhen Bao’an International Airport Station** lands inside the exact Celsius interval that Polymarket settles from Weather Underground’s **Daily Observations** table, not the summary high/low box.

The historical framing is straightforward: Shenzhen’s August climate is usually hot, humid and prone to showers, with forecast services clustering around the mid-30s Celsius for 9 August and daytime highs in the low-to-mid 30s common in comparable August records. Recent market data on Polymarket also showed the crowd concentrating on the upper-30s bands, which is consistent with a summer peak around 35–37°C rather than an outlier event. Weather Underground’s own history for Bao’an shows a high of 92°F on 9/8/2026, which is about 33.3°C, underscoring that the realised station reading can sit below headline city forecasts.[9][8][13][15]

A trader watching this market would focus on the **observed station sequence** through the settlement window, because Polymarket’s contract resolves from the first published next-day datapoint and will ignore later edits once that cutoff passes.[8] The practical dependencies are Weather Underground’s reporting cadence, any late-day convective heating, and the possibility of rain or cloud cover trimming the top reading; current local forecast material includes cloudy-to-thundery conditions, yellow rainstorm messaging and high humidity, all of which can cap the maximum even when the afternoon still looks warm.[6][7][20]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Shenzhen on August 9? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

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 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.

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.