Highest temperature in Atlanta on August 5?

Platform comparison

Market context

Polymarket is pricing this Atlanta airport temperature contract in USDC on Polygon at a near-certain *sub-90°F* outcome, with the crowd currently assigning 0% to the specific Yes leg you asked about. The settlement is tied to the highest temperature recorded at Hartsfield-Jackson International Airport on 5 August 2026 as shown on Weather Underground, so the practical question for traders is not Atlanta broadly but the final airport observation that Wunderground publishes for KATL. [1][3]

For context, the market is being read against Atlanta’s normal August heat profile, where daily highs are typically in the low 90s and the city can still print a wide range of outcomes depending on cloud cover, rain and thunderstorm timing. Recent comparable pricing on a similar Robinhood contract shows traders treating the upper-80s to mid-80s as a live band rather than a fixed point, which helps explain why conditional-token markets often concentrate around adjacent temperature brackets rather than a single exact reading. [2][3][12]

A trader watching this kind of contract would focus on the day’s official forecast updates, any convective storm risk, and the timing of the final KATL observation that determines which conditional token redeems for $1. NWS Atlanta climate products and local forecast discussions are useful for the broader setup, while the market itself will only care about the Wunderground history page once the day’s readings are complete and the next calendar day’s first observation has posted. [7][3][18]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Atlanta on August 5? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi UK, which mirrors the Polymarket order book at 0% fees.

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.

UK Frequently Asked Questions

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 Kalshi UK. 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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.