Highest temperature in Atlanta on July 27?

Platform comparison

Market context

Atlanta's highest temperature on 27 July 2026 will be recorded at Hartsfield-Jackson International Airport and resolved against historical Weather Underground data. The settlement window closes at midday UTC, meaning traders have until the official daily high is logged. This is a straightforward instrumental market: the outcome depends entirely on meteorological conditions and the station's measurement protocol, with no discretionary interpretation required at resolution.

Atlanta's July climate is remarkably consistent. The city's 30-year average high for late July sits around 32°C (90°F), with extremes rarely exceeding 37°C (99°F) or falling below 28°C (82°F). The 0% crowd probability suggests the market may be calibrated to a specific temperature threshold—likely an outlier scenario such as 40°C+ (104°F+)—rather than reflecting genuine uncertainty about whether *some* high temperature will occur. Historical data from Wunderground shows Atlanta's record July high is 40°C (104°F), achieved in 1952. Traders evaluating this market should cross-reference the actual resolution range thresholds against climatological percentiles to determine whether the crowd is pricing a realistic tail event or a miscalibrated boundary condition.

Programmatically, this market rewards automated monitoring of National Weather Service forecasts and NOAA climate models issued in the days leading to 27 July 2026. A conditional order strategy would track the 10-day outlook as it solidifies; significant heat dome formation across the southeastern United States would shift probabilities materially. The Wunderground API permits direct historical verification, enabling traders to validate resolution data immediately after settlement without manual verification delays.

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

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 Polymarket Bot UK 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.