Highest temperature in Shenzhen on July 31?

Platform comparison

Market context

Polymarket is pricing this Shenzhen airport temperature contract at **0% YES** for a day when the station usually sits in the low 30s Celsius, with a forecast regime that still allows a wide range of outcomes before the noon UTC settlement cut-off. The market resolves to the **highest recorded temperature at Shenzhen Bao'an International Airport Station** on 31 July 2026, using Wunderground’s daily history page, so the relevant print is the *day’s maximum* rather than an average or midnight observation.

For context, July in Shenzhen is typically hot, humid and rain-prone, with daily highs commonly around **31–32°C** and lows near **27°C**. Recent climate summaries also point to heavy rainfall through the month and a typhoon-influenced summer pattern, which matters because cloud cover and showers can suppress the daytime peak even when the broader seasonal climate is warm. Comparable forecast pages for Shenzhen on 31 July have shown highs around **32°C / 90°F**, with hourly temperatures often reaching the low-to-mid 30s Celsius when showers ease. [3][4][7][12][20]

For traders holding USDC on Polygon, the practical question is whether the airport station gets a clear enough window before 12:00 UTC for the reading to reach the next temperature band on the market ladder. The main catalysts are the local morning forecast, thunderstorm timing, and any last-minute rain bands or tropical disturbances affecting Guangdong; Shenzhen’s official weather service and major forecast desks have both highlighted the city’s summer rainfall and storm risk. Hourly updates closer to settlement matter more than the monthly average, because a brief late-morning spike or shower can decide which conditional token pays out. [11][19][20]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Shenzhen on July 31? 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

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.