Highest temperature in Shenzhen on July 23?

Platform comparison

Market context

Shenzhen’s highest temperature on 23 July will be measured at Shenzhen Bao’an International Airport, and the market is effectively asking whether the day’s peak reaches a notably hotter band than the city’s July norm. Shenzhen’s July climate is already hot and humid, with average daily highs around 31.1°C and average lows near 26.2°C, so a settlement outcome near the low-30s would be broadly consistent with seasonal expectations rather than an extreme print.[1]

The current crowd-implied probability of **0% YES** implies the market is assigning negligible weight to an outcome in the upper bands, which is markedly more bearish than the climatology would suggest and also looks far below what a typical summer-day distribution would imply. On a cross-platform basis, that kind of zero pricing usually indicates either thin liquidity, a stale order book, or a view that the contract’s target threshold is unlikely to be breached at the airport station even if the city itself feels very hot; by contrast, broad weather data still points to a hot afternoon regime, with current conditions already at 84°F and a RealFeel of 96°F, underscoring that heat risk remains live through the day.[2]

For traders, the key catalysts are the airport station’s actual afternoon maximum, cloud cover and rainfall timing, and whether sea-breeze moderation arrives before the daily peak. Shenzhen’s July rainfall profile is heavy enough to matter, with about 211.2 mm on average across roughly seven days in the month, so a passing shower or early convection could cap the high even when the morning starts warm.[1] Since the resolution source is Wunderground’s daily history for Shenzhen Bao’an, the live comparison is less about general city forecasts than about the airport station’s recorded maximum by day’s end.[1]

Sources: 1 · 2

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.

FAQ

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'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.

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 Kalshi vs Polymarket 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.