Highest temperature in Shenzhen on August 7?

Platform comparison

Market context

Shenzhen’s heat risk has edged up in the last 24–48 hours: the local meteorological service warned on 6 August that the city was under a yellow high-temperature alert, with highs forecast to reach **36°C or above** from the 6th to the 10th under subsiding air on the outer flank of Typhoon Podul. That is a material shift from the cooler-looking regional forecast issued early on 7 August, which still put Shenzhen at **27–34°C** for the day, but the warning points to a hotter-than-average ceiling once inland heating peaks later in the afternoon.[14][7]

For context, August in Shenzhen is normally a hot, humid month with average highs around **31–32°C** and frequent rain, so the market usually resolves in the low- to mid-30s rather than at extremes.[3][5][16][17] Forecast products now cluster around the same general band: one monthly outlook shows **32°C/27°C**, while another daily view allows for **34°C** on 7 August.[3][9][10] The current **0% YES** crowd-implied probability is hard to square with those baselines unless cloud, rain, or an unexpected marine influence keeps the airport station below the listed range.

For traders, the key catalyst is the afternoon evolution of the heat alert and any updated municipal or airport-station observations before the settlement window closes at 12:00 UTC, because the market resolves off Weather Underground’s **Daily Observations** for Shenzhen Bao’an International Airport, not the summary high/low box. The practical watchpoints are whether the warning is upgraded to orange, whether thunderstorm showers arrive early enough to cap the peak, and whether the airport station records a brief spike above the main forecast band before the day rolls over.[14][7][12]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Shenzhen on August 7? 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.

UK Frequently Asked Questions

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 Prediction Today. 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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.