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 resolved against the Daily Observations table on Weather Underground, with settlement occurring at midday UTC on that date. The market currently shows zero crowd-implied probability across all temperature ranges, suggesting either minimal trading activity or a technical reset rather than genuine consensus that no valid temperature reading will occur.

August represents peak summer in Shenzhen, with historical daily highs typically ranging between 32–34°C during this period. The city's subtropical climate and coastal location create consistent thermal patterns, though typhoon activity in late August occasionally disrupts normal temperature trajectories. Comparable August markets from prior years show most outcomes clustering in the 31–35°C band, with extreme readings above 36°C occurring roughly once per decade during particularly intense heat events. The current zero probability across all ranges diverges sharply from typical prediction-market distributions for established weather outcomes, suggesting either sparse liquidity or data synchronisation issues rather than genuine uncertainty about whether a temperature will be recorded.

Traders should monitor tropical cyclone forecasts issued by the China Meteorological Administration and regional typhoon tracking systems, as these directly influence August weather patterns in Guangdong Province. The Pacific typhoon season peaks in August, and any system tracking towards southern China could suppress daily highs or create anomalous conditions. Real-time updates from the Hong Kong Observatory and official Shenzhen meteorological bulletins will provide the most reliable forward guidance as the settlement date approaches.

Methodology

We track Highest temperature in Shenzhen on August 19? 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.

FAQ

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.