Highest temperature in Atlanta on August 5?

Platform comparison

Market context

Polymarket is pricing the 5 August Atlanta airport high as a modestly warm day, with the crowd spread across the mid-80s and the contract still settled in USDC on Polygon through conditional tokens. The market’s current read is that the most likely outcomes sit around **84-85°F** and **86-87°F**, while a **0% YES** print on the specific contract view suggests traders are treating the named range as effectively unsupported at current prices.[1]

That sits well within Atlanta’s August climatology, where highs are typically in the upper 80s and early August can still produce the sort of heat that pushes towards the low 90s on a clear day.[2][12] Historical local extremes show that Atlanta has reached the upper 90s in past Augusts, including 99°F on 26 August 2023 and 98°F on 4 August 2006, but those are outliers rather than the base case.[13] For a Polymarket user, the practical read is that this is a narrow temperature-distribution market: one or two degrees of forecast drift can shift value meaningfully between adjacent bands.

The main catalysts are the short-range forecast updates, any thunderstorm timing, and whether cloud cover or rain suppresses daytime heating before the airport station posts its final maximum.[9][17] Traders will also watch how terminal and metro forecasts converge, since the market resolves from the Hartsfield-Jackson International Airport Station on Weather Underground, not a broader city average.[3][6] A late shift in the daily forecast from the low 90s towards the upper 80s would matter far more here than any abstract seasonal trend, because the payout depends on the single highest observed airport reading for that calendar day.[3]

Sources: 1 · 2 · 3 · 4 · 5

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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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 PolyGram. 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.

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 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.