Highest temperature in Miami on August 5?

Platform comparison

Market context

Miami’s 5 August high is a simple daytime temperature print at Miami International Airport, but the settlement hinge is narrow: the market resolves from the day’s highest reading at KMIA on Wunderground, so intraday convective cloud cover, sea-breeze timing and thunderstorm outflow matter more than the morning start. With the crowd currently at 0% YES, the practical read is that traders are either unconvinced the posted range can be reached or that the market is mispriced relative to the forecast path; programmatically, the cleanest approach is to map the live or published daily high forecast into the market’s discrete outcome bands and compare it against the historical August distribution for Miami rather than reacting to spot temperatures.

For context, Miami in August is typically hot enough that highs in the upper 80s Fahrenheit are common, and recent forecast material for the date pointed to about 87–89°F, with one market page citing a daily high near 89°F and another trading venue showing 86°F at a materially different price. That means the key comparator is not whether it will be warm, but whether the airport reaches the upper part of its expected envelope before storms limit heating. In historical terms, late-summer Miami often clusters around the high 80s, so a 0% YES mark is most useful as a signal to check whether the market is lagging the weather model consensus rather than a statement that an extreme outcome is likely.

The main catalysts to watch are the National Weather Service forecast updates, any Miami-area short-term thunderstorm timing changes, and the official Wunderground daily-history page as the settlement cut-off approaches. For a bot or spreadsheet workflow, the relevant inputs are the latest forecast high, hourly cloud and precipitation timing, and whether the day’s first report for 6 August has appeared, because the market rules exclude later revisions after that point. If forecasts hold near 89°F with scattered afternoon storms, the highest-probability outcomes should remain the adjacent upper-80s bands; if convection arrives earlier than expected, the observed high can underperform the headline forecast even in a broadly hot pattern.

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Methodology

This page reviews Highest temperature in Miami 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 Polymarket Review UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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 Polymarket Review 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%.