Highest temperature in Atlanta on July 13?

Platform comparison

Market context

Atlanta's peak temperature on 13 July 2026 will be measured at Hartsfield-Jackson International Airport, the official weather station for the city. The settlement window closes at midday on that date, capturing the highest reading recorded across the full calendar day. Current crowd-implied probability sits at 0%, suggesting traders are either awaiting temperature range options or treating the market as inactive pending clarification of available brackets.

Historical July temperatures in Atlanta provide essential calibration. The city's all-time July high stands at 100°F, recorded in 1952, whilst median July highs typically range between 88–92°F. Over the past two decades, temperatures exceeding 95°F occur roughly once every three to four Julys, making extreme heat outliers rather than routine occurrences. The National Weather Service's 30-year normal for Atlanta's July maximum is 88°F, establishing a baseline against which any specific prediction market range should be evaluated.

The National Oceanic and Atmospheric Administration's seasonal outlook and any heat dome forecasts issued in early July 2026 will be critical catalysts. Traders should monitor the Climate Prediction Center's 6–10 day forecast issued around 4 July, which typically provides the most reliable signal for mid-month temperature extremes. Atmospheric patterns favouring high-pressure systems over the Southeast—particularly ridge development—would support above-normal temperatures, whilst tropical moisture or frontal passages could suppress peaks. The absence of visible temperature brackets currently suggests the market may require activation or clarification before meaningful trading occurs.

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

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.

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 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.