Highest temperature in Shenzhen on August 19?

Platform comparison

Market context

Shenzhen's daily maximum temperature on 19 August 2026 will be recorded at Bao'an International Airport Station and cross-referenced against Weather Underground's Daily Observations table. The market resolves to a specific temperature range; traders must distinguish between the primary Daily Observations dataset and the Day High & Low summary section, as historical discrepancies between these two sources have occasionally created resolution ambiguity on similar weather markets.

August represents peak summer in Shenzhen, with historical daily highs typically ranging from 32–34°C during this period. The 0% crowd probability suggests either insufficient liquidity or a perception that the market's upper temperature ranges are implausibly wide. Comparable August markets in southern China have shown that extreme heat events (35°C+) occur roughly 15–20% of the time, whilst moderate highs (30–32°C) dominate the distribution. Traders automating position monitoring should flag that Weather Underground's data refresh schedule occasionally lags by several hours, potentially affecting same-day settlement confirmation.

Programmatic traders should establish conditional orders keyed to meteorological forecasts released by the China Meteorological Administration, typically issued five to seven days ahead. Typhoon activity in the South China Sea during mid-August could suppress temperatures significantly; the 2024 season saw two tropical systems affect the region in late August, reducing daily highs by 3–5°C. Monitoring real-time satellite imagery and pressure systems through early August will provide the clearest signal for range positioning. Weather Underground's API access allows automated polling of historical station data, enabling backtesting against prior August distributions at Bao'an before settlement.

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Review UK, which mirrors the Polymarket order book directly.

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

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%.