Highest temperature in Miami on August 6?

Platform comparison

Market context

Miami’s **6 August heat** was always more likely to land in the high-80s Fahrenheit than to break into the low-90s, because late-summer highs in south Florida are usually capped by humidity, sea-breeze effects and afternoon convection. AccuWeather’s August outlook for Miami showed daily highs clustered between **87°F and 89°F**, while Polymarket’s contract snapshot had **88-89°F** as the front-runner at **45%** and **86-87°F** next at **30%**[1][2]. That makes a **0% YES** price look detached from the weather setup rather than from a one-off extreme reading.

For traders, the key historical frame is that Miami regularly posts highs close to its seasonal average in early August, with the long-run August norm around **90°F/78°F** and recent 2026 comparable days already printing in the low- to mid-90s on some dates, which keeps the upside tail alive if clouds break early[1][3][12]. Because settlement uses the **Weather Underground Daily Observations** figure at **Miami Intl Airport Station**, the relevant question is not the headline forecast but the actual observed peak and whether later data revisions appear before the first datapoint for 7 August is published[2][9].

Catalysts are straightforward: watch for afternoon thunderstorm timing, any sharp shift in the National Weather Service forecast, and the final Wunderground observation sequence from KMIA into the evening. On the crypto side, the contract settles in **USDC**, so the practical price path is driven more by order-book liquidity than by BTC or ETH beta unless a broader risk-off move changes positioning across prediction markets; recent crypto-market data showed large spot and derivatives flows remain capable of moving short-dated market pricing when traders hedge aggressively[2].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Highest temperature in Miami on August 6? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

UK Frequently Asked Questions

What are crypto prediction markets?

Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.

What does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

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%.