Highest temperature in Miami on August 6?

Platform comparison

Market context

Miami’s temperature on 6 August 2026 will be settled by the **highest Fahrenheit reading** recorded for Miami International Airport in Weather Underground’s **Daily Observations** table, not the summary high-and-low box. For a newcomer to prediction markets, a **YES share** pays out \( \$1 \) if the contract’s exact condition is met, while a **NO share** pays out \( \$1 \) if it is not; here, that means the market is really asking which temperature band contains the day’s top observed reading at KMIA.[2][7]

The crowd is currently pricing the event as very unlikely to land outside the listed temperature bands, with the front-runner on the exchange sitting in the high-80s rather than the extremes. That fits Miami’s typical August climate, where average highs cluster around 90°F and the month often produces warm but not exceptional daytime peaks.[1] Recent comparable weather data for Miami also shows many summer highs in the upper 80s to low 90s, which helps explain why mid-range bands have tended to attract the most interest in similar temperature contracts.[1][4]

Traders should watch the actual airport observation feed, not general city forecasts, because the outcome depends on the final maximum logged before the day closes in Weather Underground’s history view.[2][7] The key catalysts are any late-day spike in heat, sea-breeze or thunderstorm effects that cap the daytime high, and the timing of when Weather Underground publishes the next day’s observations, since that is what finalises the record used for settlement.[7] For broader context, NOAA’s climate products and the National Weather Service daily climate reports are useful for comparing what was observed against normal August conditions in Miami.[3][6]

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.

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 Prediction Market UK. 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.

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%.