Highest temperature in NYC on August 3?

Platform comparison

Market context

New York has already had enough heat this season that traders are mainly weighing whether LaGuardia tops out in the low- to mid-80s or slips just below that band. The current crowd pricing has 0% for a yes-style tail outcome, which is consistent with a market that is anchored around a warm but not extreme August afternoon rather than a breakout heat event.[1]

That reading fits the broader August pattern for New York, where highs in the low 80s are common and the difference between 82°F and 86°F often comes down to cloud cover, sea breeze and the exact timing of the daily peak. Historical weather data for the city and airport area show August highs frequently clustering in the low-to-mid 80s, so a temperature range market like this tends to be decided by small forecast errors rather than a major regime shift.[7][12]

For the final hours, the key catalysts are the late-day forecast updates, any change in thunderstorm timing, and whether the airport gets enough sunshine before early evening to push the maximum one or two degrees higher. Market guidance cited by Polymarket points to a daytime high of 82–85°F, with the two leading bands almost tied, so any model revision or observed station trend into the afternoon can still matter materially.[1]

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.

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.

Do I need to KYC for this market?

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