Highest temperature in Atlanta on August 1?

Platform comparison

Market context

Atlanta’s **highest temperature on 1 August 2026** will be measured at Hartsfield-Jackson and settled against Wunderground’s daily history page, so the relevant number is the day’s maximum reading rather than the afternoon forecast peak. The crowd is currently pricing the leading range at **0% YES** in the user prompt, which is notably at odds with the platform view shown in the market snapshot, where traders were clustering around the mid-80s Fahrenheit bands, especially 86–87°F at 31% and 82–83°F at 22%[2]. That split matters because the contract resolves by a single daily high, and Atlanta’s early-August records show a normal high close to 90°F, with 1 August historically averaging 89.6°F and a record high of 99°F for that date[1].

For context, Atlanta’s August climate is typically hot and humid, and recent summaries still point to frequent highs in the upper 80s to low 90s, with August 2026 monthly guidance from AccuWeather showing highs roughly in the 86–92°F range[3][15]. That makes the market’s centre of gravity much more consistent with a high-80s outcome than with a sub-80 reading, unless cloud cover, rain, or a thunderstorm complex suppresses the afternoon maximum[2][9]. A 0% YES crowd-implied probability therefore looks detached from both climatology and the published platform probabilities, which are much closer to the historical seasonal pattern[1][3].

Traders should watch the near-term Atlanta forecast cycle, especially any shift in rain timing, thunderstorm coverage, or cloud thickness during the warmest part of the day, because those are the main variables that can move the high from the upper 80s towards the low 80s[2][9]. National Weather Service climate products and local forecast updates are the key dependencies for whether the airport station reaches the mid-80s, while any late-day convection would matter only if it arrives before the temperature peak is set[11].

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

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.

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.

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.