Highest temperature in Miami on August 25?

Platform comparison

Market context

Miami has already pushed into the low 90s today, with NWS Miami flagging afternoon peaks in the low to mid 90s and scattered showers developing later in the day. The latest KMIA observations showed 92°F around early afternoon, then 86°F with thunderstorm activity and lightning observed, which keeps the high range close to the hot end rather than opening the door to an outlier spike.

That leaves the market reading the usual late-August Miami pattern: intense heat, but often capped by cloud, sea-breeze convergence, or pop-up storms. The climate report for 25 August shows a daily maximum of 92°F so far at Miami International Airport, with the historical ceiling for the date at 94°F, so a settlement in the 90–94°F band remains the most natural frame if conditions stay seasonable.

The main catalysts now are the afternoon convective timing and whether showers move over the airport before the day’s top reading is set. NWS Miami has no watches or warnings in force, but its forecast still calls for scattered showers and continued low-to-mid 90s highs, so traders should watch the hourly KMIA observations rather than broader city forecasts, because the market resolves from NOAA’s highest airport reading only.

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Methodology

We track Highest temperature in Miami on August 25? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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%.