Highest temperature in Shenzhen on August 19?

Platform comparison

Market context

Shenzhen's August weather patterns show consistent high temperatures, with the city's subtropical climate typically delivering daily maxima between 32–35°C during mid-August. The 0% crowd probability suggests traders expect the settlement range to fall below whatever threshold this market's lowest bracket represents, though historical data from Shenzhen Bao'an International Airport—the official resolution station—indicates temperatures rarely dip below 31°C during this period. August 19th sits within the city's peak summer season, when afternoon thunderstorms occasionally provide temporary relief but rarely suppress daily highs significantly.

Historical August records at Bao'an Airport show temperatures consistently exceeding 32°C on the 19th across multiple years, with several instances reaching 34–35°C. The 0% probability reading suggests the market's lowest temperature bracket may be set at 36°C or higher, placing it above the typical range for this date. Traders should note that whilst extreme heat events do occur in Shenzhen, they're less common in mid-August than in July, when the city frequently records 35°C+ readings.

The critical factor for resolution is Weather Underground's Daily Observations table at Bao'an Airport, which may differ from summary forecasts. Traders should monitor actual recorded temperatures rather than forecast models, as the distinction between the Daily Observations and Day High & Low sections determines the final settlement. No major weather system announcements typically precede August 19th conditions, making this primarily a data-dependent market dependent on real-time temperature recordings.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

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%.