Highest temperature in NYC on July 4?

Platform comparison

Market context

The underlying event is the peak heat recorded at LaGuardia Airport on 4 July 2026, which will determine the resolution of a temperature-range market. Current crowd-implied probability sits at 0% for the highest temperature falling in the upper range, suggesting traders expect conditions to remain well below extreme thresholds. This stance contrasts sharply with recent historical anomalies where LaGuardia hit 94°F at midnight and even 104°F during the day, surpassing Phoenix and breaking the 101°F record from 1966[2][6].

Historical data frames the current probability as unusually cautious. The all-time high for LaGuardia remains 107°F, recorded on 3 July 1966, yet recent years show LaGuardia frequently exceeding 90°F at midnight and reaching 100°F+ in daytime heatwaves[8]. The 2026 July forecast predicts highs between 81°F and 99°F, with overnight lows from 68°F to 83°F, indicating that while extremes are possible, the market may be leaning on the absence of a confirmed heat dome or sustained high-pressure system[4].

Traders should monitor scheduled weather declarations, campaign-finance disclosures tied to climate policy, and any polling shifts on extreme-weather preparedness. A key catalyst is the National Weather Service’s daily climatological updates for LaGuardia, which could confirm if a heat dome is forming ahead of 4 July[1]. Recent Fox Weather reports highlight that LaGuardia has already recorded NYC’s warmest midnight temperature, suggesting the market may be underestimating the likelihood of another extreme spike if atmospheric conditions intensify[5]. The market leans on the absence of a confirmed heat event, but recent records show heat can surge rapidly.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Political prediction markets differ structurally from sports betting: thinner liquidity, longer settlement windows, higher sensitivity to single news events. This page shows the live Polymarket quote for Highest temperature in NYC on July 4? plus platform attributes for the three reference venues, so you can see at a glance where the deepest market for this question sits.

Resolution & payout

For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.

FAQ

What resolution source is used for elections?

Polymarket defines the source per contract — usually Associated Press (AP Race Call), Reuters or the official electoral commission. The source is stated in contract details before the market opens.

Can prediction markets influence election outcomes?

Markets reflect expectations rather than create them. Studies show public-facing markets can anchor expectations, but don't influence the underlying outcome. Political markets are information, not advocacy.

How fast do political markets react to news?

High-liquidity markets move within seconds to minutes. A Trump tweet on the economy can shift the "Trump 2024" market 2-5 points before mainstream media has written anything.

Are political prediction markets legal in my country?

It varies. They sit in legal gray areas in most jurisdictions. Polymarket is geo-blocked from US/UK/EU; some broker frontends have a different geo footprint. Trade only with capital you can afford to lose, and only if you understand the legal status in your jurisdiction.

Why do Polymarket and Kalshi differ on elections?

Kalshi must follow CFTC compliance — strict definitions, clear resolution sources, US citizens only with KYC. Polymarket operates globally without CFTC oversight — deeper liquidity, but also higher regulatory risk.