Highest temperature in NYC on July 8?

Platform comparison

Market context

The real-world event driving this market is the peak daytime heat expected at LaGuardia Airport on 8 July 2026, with the settlement tied to the highest Fahrenheit reading recorded anywhere on that day. Current crowd-implied probability sits at 0% for the lowest temperature range, while consensus overwhelmingly favours the 86–87°F bracket at 100%, reflecting traders’ belief that the recent extreme heatwave will persist or repeat.

Historical context frames this probability sharply: the July 2026 heatwave broke records across a 500-mile East Coast corridor, with LaGuardia hitting 104°F on 2 July and 102°F on 4 July, shattering 14–154-year records [1][3][10]. Midnight temperatures also surged to 94°F, a new station record [3][6][8]. Given that July normals peak at 86°F but recent highs have exceeded 100°F, the 0% probability for the lowest range is logically sound, yet the 100% concentration on 86–87°F may overlook value in slightly higher ranges if the heatwave lingers.

Traders should monitor the National Weather Service’s daily climatological forecasts for LaGuardia, which list tomorrow’s maximum normal at 86°F but note the record high of 98°F from 1993 [4]. With the heatwave persisting into early July and no immediate cooling systems announced, the dependency is on sustained atmospheric pressure patterns typical of East Coast summer extremes [1]. Watch for updates from FOX Weather on midnight temperature trends, as recent data shows heat lingering well past sunset [3][5]. Contrarian value may sit just above 87°F if the current 100% consensus underestimates the heatwave’s duration.

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 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.