Highest temperature in Miami on August 6?

Platform comparison

Market context

Miami’s highest temperature for 6 August is the event that matters here, and the market is trading far below the weather profile implied by most public forecast and model outputs. AccuWeather’s Miami monthly page shows 6 August at 89°F/79°F, while Zyntra’s event page clusters almost entirely around **88-89°F** with a 100% implied chance in that band; by contrast, the contract’s crowd-implied probability is **0% YES**, a sharp divergence from those temperature readings and from the broader consensus that a mid-to-high 80s maximum is the base case.[1][2]

For context, Miami’s August climate usually sits in the upper 80s to low 90s, with humidity and afternoon convection keeping outcomes tightly packed unless a significant weather disturbance arrives. Extreme Weather Watch lists Miami’s 2026 highs at **94°F on 1 August**, **93°F on 3 August** and **92°F on 4 August**, which shows that hotter-than-normal days are possible even in a wet season pattern.[3] That history matters because this contract resolves off the **Weather Underground Daily Observations** for Miami International Airport, not the summary high-low display, so traders should focus on the station observation rather than a headline forecast figure.[4][5]

The main catalyst is whether south Florida stays under ordinary summer sea-breeze thunderstorm conditions or picks up additional cloud cover and rain from a tropical disturbance. The broader seasonal setting is hurricane season, which runs from **1 June to 30 November**, with peak activity typically in August through October, so any nearby system can materially cap daytime heating or, less often, produce an even hotter pre-storm air mass.[10] With settlement keyed to a single station reading at Miami Intl Airport, the late-day observation path and any weather-service updates that affect local cloud, wind and rain timing are the variables most likely to move pricing between the weather market and any sportsbook-style line, if one is posted.[4][10]

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

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.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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'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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi vs Polymarket trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.