Highest temperature in Shenzhen on July 22?

Platform comparison

Market context

The relevant event is the day’s maximum temperature at Shenzhen Bao’an International Airport, which the market resolves from the highest reading recorded there on 22 July via Wunderground. At 09:30 UTC, the live market was still clustered around the low-30s Celsius, with 32°C the frontrunner at 43% and 33°C close behind at 36%, so the implied distribution is tightly packed rather than decisive.[1]

For a power-user, this is the sort of contract that can be approached with a simple rules engine: ingest the airport forecast, map the day’s expected high into the listed temperature bands, and update odds as new runs land. The current weather picture supports that low-30s framing, with Shenzhen Bao’an showing overcast conditions and a temperature of 84°F, while forecast services point to a peak of 32–33°C and a high chance of precipitation, which can cap extremes even when humidity is high.[2][3][4] That leaves little room for a large surprise unless convection breaks earlier cloud cover more effectively than model guidance suggests.

The main catalysts to watch are the intraday forecast refreshes, any thunderstorm timing shifts, and whether the airport station itself records a late-afternoon spike before the settlement window closes at 12:00 UTC. Traders using bots or conditional orders would typically key off forecast updates rather than headlines, because the settlement source is a single station reading rather than a citywide average; in practice, the decisive signal is whether successive runs keep the maximum pinned at 32°C or migrate one band higher.

Sources: 1 · 2 · 3 · 4

Methodology

We track Highest temperature in Shenzhen on July 22? 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

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.

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 Fees 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.