Highest temperature in Shenzhen on August 1?

Platform comparison

Market context

Polymarket is pricing this Shenzhen temperature contract at **0% YES** today, even though the market settles on the highest reading at Shenzhen Bao’an International Airport Station during the August 1 local-day window, with resolution tied to the Wunderground history page and paid out in USDC via Polygon conditional tokens. That implies traders are currently assigning no chance to a qualifying range above the market’s listed threshold, not that the city will be cool in an absolute sense.

For context, Shenzhen is typically very hot in August: long-run monthly averages cluster around 32°C by day, with common highs in the high 80s to low 90s Fahrenheit and humidity staying elevated.[2][4][10] Historical ranges also show that early-August peaks can push into the mid-30s Celsius, with some guides recording daily highs around 36°C and a rare extreme above 100°F in past years.[4][9] In that setting, a 0% spot can reflect contract structure as much as weather expectations, because the relevant figure is the single highest airport-station temperature recorded before the midday UTC settlement cutoff, not the day’s average.

For traders, the main catalysts are the actual Shenzhen airport observations on Wunderground as the day unfolds, plus any abrupt shift in the regional rain/typhoon pattern that can cap or amplify daytime heating. Shenzhen’s August climatology includes substantial rainfall and frequent humid, cloudy conditions, so a convective shower or storm track can trim the high, while clear morning sunshine can lift the maximum before noon local time.[1][10][20] The practical watch item is therefore the sequence of airport station updates, not a broad city forecast, because the market resolves off that specific sensor and timestamped daily high.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Shenzhen on August 1? 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

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

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

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.