Highest temperature in Shenzhen on August 3?

Platform comparison

Market context

Shenzhen’s peak temperature at Bao’an International Airport on 3 August will be set by the single highest reading posted in the daily Wunderground history page, so the practical question is not the day’s mean temperature but whether the afternoon spike clears one of the listed Celsius bands before the reset time. Early-August normals in Shenzhen are firmly summer-like, with forecast services showing highs around 31–33°C and warm overnight lows in the high 20s, which makes mid-to-high 20s an implausibly low reading and leaves the main distribution concentrated around 28–31°C.[2][4][14]

That framing helps explain why the market’s 0% YES on any given band is less about certainty than about granularity: traders typically resolve this kind of event by feeding hourly forecasts, radar, and airport observations into a simple band-mapping model, then updating if convective rain or cloud cover trims the maximum by a degree or two. Timeanddate identifies Shenzhen Airport as the observation station, while BBC and AccuWeather both show humid, changeable conditions and light showers in the area, which are exactly the sort of inputs that can cap the high even when the broader synoptic pattern remains hot.[9][10][11]

For a programmatic workflow, the key catalysts are the morning forecast run, any late-day shower line, and the appearance of the first post-midnight datapoint on the source page, because after that cutoff later edits should not matter for settlement. Traders watching this through bots or conditional orders would usually poll the airport station feed, compare it with the Wunderground history page, and adjust only if a rainfall burst or sudden clearing shifts the expected maximum into a neighbouring bracket; current forecast services still point to a hot, humid day with shower risk rather than a clean, one-way heat surge.[2][8][17]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Shenzhen on August 3? 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

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

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.

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.

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.