Highest temperature in Shenzhen on August 18?

Platform comparison

Market context

On 18 August 2026, the highest temperature recorded at Shenzhen Bao'an International Airport Station will determine the settlement outcome for this market. The resolution hinges on data from Weather Underground's Daily Observations table rather than summary figures, a distinction that occasionally produces meaningful divergence in historical records. Shenzhen's August climate typically yields daily highs between 32–35°C, though extreme heat events can push readings several degrees higher.

Historical August temperature records for Shenzhen show considerable year-to-year variation. The city's highest August temperatures on record exceed 37°C, whilst cooler August days have registered below 30°C. The 0% crowd-implied probability across prediction markets suggests traders are pricing in either a specific temperature threshold as unlikely or reflecting genuine uncertainty about which range will capture the day's peak. Comparable weather prediction markets on major Chinese cities show wider probability distributions during summer months, indicating that August heat forecasting carries inherent volatility even with modern meteorological modelling.

Traders should monitor tropical cyclone activity in the Western Pacific during early-to-mid August 2026, as such systems can suppress temperatures substantially or, conversely, drive extreme heat through atmospheric pressure dynamics. The China Meteorological Administration's seasonal forecasts, typically released in July, will provide directional guidance on whether August 2026 tracks toward above-normal or below-normal temperatures for the region. Any significant weather pattern shifts in late July will be critical inputs for reassessing the probability distribution across temperature bands.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Best Prediction Markets. 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.

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.

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.