Highest temperature in NYC on July 12?

Platform comparison

Market context

New York City is currently enduring an unprecedented heat wave, with LaGuardia Airport smashing records earlier this month by hitting 104°F on 3 July and maintaining a historic 94°F midnight temperature on 4 July. The prediction market for the highest temperature on 12 July 2026 shows a crowd-implied probability of 0% for any outcome, suggesting traders believe the peak of this extreme event has already passed or that the specific date will not match the early-month intensity.

Historical data from this July 2026 event frames the current pricing as a reaction to the sheer volatility of the heat wave, which broke records standing for over a century across a 500-mile East Coast corridor [2]. While LaGuardia reached 104°F on 3 July, surpassing the 1966 record by 3°F, the market’s zero probability implies a consensus that the 12 July high will fall significantly below the thresholds seen during the holiday weekend surge [2]. Comparable cases from previous heat waves suggest that while temperatures remain elevated, the absolute peaks often occur during the initial days of such events rather than later in the month.

Traders should monitor real-time updates from Weather Underground for the KLGA station, as the settlement relies exclusively on this source for the daily high [3]. The primary catalyst is the persistence of the current atmospheric conditions; if the heat wave lingers as forecasted with daily highs ranging up to 91°F, the 0% probability may be mispriced relative to the actual risk of a late-month spike [6]. No new official announcements are expected to alter the settlement rules, but the divergence between the extreme early-July readings and the current market pricing offers a clear arbitrage angle for those betting on a sustained heat event.

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

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 Best Prediction Markets. 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.

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 Best Prediction Markets 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.