Highest temperature in Shenzhen on August 8?

Platform comparison

Market context

Shenzhen Bao’an International Airport’s highest temperature on 8 August is the settlement event, and the current print on Weather Underground already shows **98°F at 2:00 PM** in the Daily Observations table, which is the source that matters for resolution rather than the summary strip. That means programmatic trackers should poll the history page directly, parse the observation rows, and map the maximum Celsius value to the market’s settlement bands, rather than relying on a forecast widget or the “Day High & Low” box. [5]

A 0% crowd-implied probability is hard to reconcile with the live weather context unless the market is stale or traders are anchoring to the wrong source. Shenzhen’s August climate is typically hot and humid, with historical and forecast services putting daily highs around the low 30s Celsius and today’s forecast in the mid-to-upper 90s Fahrenheit, so a result in the high-30s Celsius range is not a tail event. Comparable weather histories also show that the midday maximum is often reached early enough to be captured before the settlement window closes, which matters for conditional-order logic and automated alerts. [10][12][16][17]

The main catalysts are straightforward: updated observations on Weather Underground, any late-afternoon thunderstorm activity, and whether the airport station continues to post new hourly readings before 12:00 UTC. AccuWeather flags a stray thunderstorm this evening and a hot, partly sunny day, which is relevant only insofar as convective clouds can cap the final high or leave the current maximum unchanged. A disciplined workflow is to watch the station feed for a new peak, compare it with the Celsius band in the market rules, and avoid using the forecast high unless the live table stops updating. [5][17]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Shenzhen on August 8? 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.

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

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.

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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%.