Highest temperature in Atlanta on August 1?

Platform comparison

Market context

Atlanta’s hottest reading on 1 August will be set by the daytime maximum at Hartsfield-Jackson, and the market is pricing the result as an exceptionally low-tail event with the current crowd implied at **0% YES**. That looks consistent with the venue’s long-run August profile: Atlanta’s August daily highs typically sit in the upper 80s to low 90s Fahrenheit, while the airport’s all-time heat benchmark is 106°F and the August record high is 104°F, both far above a normal early-August outcome.[2][6][9][12]

For comparison across books, Polymarket expresses the view in discrete temperature bands, while Kalshi and Betfair-style markets typically translate the same weather risk into contract prices or decimal odds, so a 0% implied probability can still hide small bids if the contract is wide or fees are high. Atlanta’s recent summers have shown that upper-90s outcomes are possible but unusual; the airport reached 95°F in August 2025 and 99°F in August 2023, which are the sort of recent comparables traders use to gauge whether a heat ridge can push the day into a higher bucket.[2][8] For Smarkets or Betfair, any sharper-looking price may reflect commission and liquidity rather than a materially different weather view, while access and KYC rules also differ by platform and can affect who is able to take the other side.

The main catalysts are the forecast track in the final 48-72 hours, especially the position of the subtropical ridge over the south-east, cloud cover, and any afternoon thunderstorm chances that can cap the maximum temperature. The settlement source is the Wunderground history page for the Atlanta airport, so traders will also watch whether the final daily high is set during late afternoon rather than early in the day, since that can matter in marginal bands. A market like this is usually driven less by scheduled announcements than by model updates and short-range forecast revisions, with the National Weather Service’s Atlanta climate and forecast products, plus weather-history pages for the airport, being the practical reference points.[4][7][14]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Atlanta on August 1? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Polymarket Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.