Highest temperature in Shenzhen on July 14?

Platform comparison

Market context

Shenzhen's mid-July heat will be measured against historical benchmarks on 14 July 2026, with the settlement hinging on the single highest temperature reading recorded at Bao'an International Airport Station throughout that calendar day. The resolution mechanism pulls directly from Wunderground's historical weather database, which logs hourly observations and derives daily maxima—a straightforward data feed that eliminates ambiguity around measurement location or methodology. Traders automating this market should note that Wunderground's interface requires manual unit conversion via the settings gear; programmatic access to their API would bypass this friction, though the free tier has rate limits worth accounting for in bot logic.

Shenzhen's July temperatures have historically clustered between 32–35°C as daily highs, with occasional spikes to 36–37°C during heat waves. The 0% crowd probability suggests either extreme confidence in a cooler-than-normal outcome or thin liquidity masking genuine uncertainty. Comparable Asian subtropical cities show July variance of 3–4°C year-on-year, driven by monsoon timing and upper-atmosphere pressure patterns rather than predictable seasonal drift.

The relevant catalyst is the East Asian summer monsoon's onset phase in early-to-mid July, which can suppress temperatures by 2–3°C if it establishes early, or allow heat domes to persist if it stalls. China's Meteorological Administration publishes 10-day forecasts fortnightly; the June 2026 update will be the last reliable signal before settlement. Traders should integrate this forecast release into conditional order logic, as a monsoon delay announcement would shift probability mass toward higher temperature brackets within 48 hours of publication.

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

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'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.

Do I need to KYC for this market?

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