Highest temperature in NYC on July 9?

Platform comparison

Market context

The LaGuardia Airport heat wave has intensified sharply over the last 48 hours, with midnight temperatures hitting record highs that defy typical cooling patterns. On July 4, the station recorded 94°F around midnight, establishing a new benchmark for the warmest midnight temperature in its history and confirming that heat is lingering far longer than usual [3][4]. This persistent warmth, coupled with dew points above 70°F, has kept heat indices elevated even without daytime sunshine, fundamentally altering the thermal baseline for the upcoming July 9 settlement window [3].

Historically, July highs at LaGuardia average 87°F, but recent extremes suggest the 0% crowd-implied probability for the highest range may be misreading the current trajectory [1]. The 2002 record high minimum of 78°F was shattered by the new 84°F benchmark, indicating a structural shift in night-time retention that could push daytime peaks well beyond the 96°F upper forecast limit [1][3]. Comparable cases from the 2013 heat wave, which saw a 93°F midnight record, now appear as conservative precedents rather than accurate predictors for this year’s volatility [4].

Traders must monitor the National Weather Service’s daily climatological reports and any sudden shifts in dew point trends, as these directly dictate the resolution source from Wunderground [2][10]. A recent report from Watchers.news highlights that the station’s new record high minimum temperature is a critical dependency for forecasting July 9 outcomes, meaning any further elevation in overnight lows will likely compress the cooling window before sunrise [3]. With the settlement window ending at 12:00 UTC on July 9, 2026, the focus remains on whether the current heat dome will sustain its intensity or break before the final data release [2].

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

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 Prediction Today. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.

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.