Highest temperature in Miami on August 6?

Platform comparison

Market context

Polymarket has this Miami airport temperature contract marked at **0% YES**, even though the underlying event is simply whether the hottest reading at Miami International Airport on 6 August lands in the specified Fahrenheit band. For traders funding positions in USDC on Polygon through conditional tokens, the practical question is not whether Miami can be hot, but whether the Weather Underground daily-observations record for KMIA will print a value inside that range before settlement. The market’s own resolution language matters here: it keys off the **Daily Observations** table, not the summary “Day High & Low” figure, so the final print can matter more than the headline number.[9][2]

Historically, Miami in August sits near the low 90s Fahrenheit on the highs, with AccuWeather’s August norms for Miami showing a historical average high of about **90°F** and average low of **78°F**.[1] Recent comparable pricing also points to the contract clustering in the high-80s to low-90s band: one related market snapshot showed **88–89°F** as the dominant outcome, with lower prices on both cooler and hotter tails.[2] That framing is useful because the market is not asking for an extreme heat event; it is asking for a specific daily maximum at a coastal airport station that is often constrained by sea breezes, cloud cover and afternoon showers.

The main catalysts are operational rather than dramatic: the day’s observed maximum depends on the timing of thunderstorms, rain bands and cloud cover across South Florida, plus any late-afternoon clearing that allows temperatures to recover. The National Weather Service’s Miami climate reporting and monthly data show how quickly daily highs can vary even within a humid summer regime.[3][5] Traders should also watch for any tropical disturbance in the Atlantic basin, because August sits inside the June-to-November hurricane season and systems can sharply alter cloud cover, rain chances and daytime heating.[10] The settlement mechanics mean the on-chain position only pays once the Weather Underground historical table is complete for that date, so the final print, not the intraday forecast, is what decides the tokens.[9]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Miami on August 6? 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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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%.