Highest temperature in Atlanta on August 1?

Platform comparison

Market context

The settlement hinges on the hottest reading at Hartsfield-Jackson on 1 August, and the crowd is treating a **sub-86°F** outcome as a clear outsider with the market showing **0% YES** for the event as framed. That makes the current consensus heavily skewed towards a mild finish to the day rather than a classic Atlanta scorch, with the “favourite” likely sitting in the mid-80s band rather than the upper 80s or above.

Historically, Atlanta’s early-August climate supports that bias: the city’s long-run August average high is around **89.6°F**, but the record for **1 August** is only **99°F**, which is high enough to allow heat spikes while still leaving plenty of room for ordinary afternoons in the mid-to-upper 80s.[1] Recent market pricing also points to that shape, with the leading contract around **86–87°F** and a neighbouring cluster in the **82–89°F** range, implying traders see modest upside but no strong case for an extreme print.[2] In handicapper terms, the favourite remains “warm, not hot”, while the value case is a contrarian lean to a hotter-than-expected top end if skies stay clear through peak heating.

The main catalysts are the day-of forecast details: cloud cover, storm timing, and whether convection arrives early enough to cap the high before the afternoon peak. Ensemble-style guidance cited in the market description already suggests limited spread in the mid-80s, with late-day thunderstorms or thicker cloud cover able to hold the maximum below **86°F**.[2] Atlanta’s August pattern is often humid with frequent afternoon and early evening thunderstorms, so any forecast change on shower timing is the key dependency for traders watching whether the favourite holds or an upper-band outcome gains traction.[9][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

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

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 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.