Highest temperature in NYC on July 2?

Platform comparison

Market context

On 2 July 2026, the highest temperature recorded at LaGuardia Airport in New York City will determine the outcome of a prediction market, with settlement based on Wunderground data. The current crowd-implied probability of 0% for a specific outcome suggests the market expects the temperature to fall outside that range, likely reflecting typical early-July highs between 81°F and 99°F as forecast by AccuWeather[2]. Historical records show LaGuardia reached 107°F on 3 July 1966, its all-time peak, while 101°F was recorded on 2 July 1966, indicating that extreme heat is possible but not guaranteed[6][7].

Traders should monitor daily climatological reports from the National Weather Service and heat advisories, particularly given the recent forecast of mid-to-upper 80s warming to lower-mid 90s with heat indices in the upper 90s for 2 July 2026[5]. Delta Airlines has issued a high-heat bulletin for travel dates 1–4 July, signalling operational concerns that may correlate with temperature spikes[9]. When comparing platforms like Polymarket, Kalshi, Betfair, and Smarkets, note that Polymarket and Kalshi use implied probabilities while Betfair and Smarkets rely on decimal odds; fee structures and KYC requirements also diverge significantly, with Kalshi demanding full identity verification whereas Polymarket offers more anonymity for US users.

The market’s resolution hinges on precise Wunderground data for LaGuardia, and any discrepancy between forecasted and actual highs could shift implied probabilities rapidly. With settlement ending 2026-07-02T12:00:00Z, traders must act before the window closes, as real-time updates from Wunderground and NWS will be the definitive sources[3]. Platform differences in liquidity and fee transparency further influence where traders place bets, with Kalshi offering regulated clarity but higher barriers, while Polymarket provides speed and lower fees but less regulatory oversight.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in NYC on July 2? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Polymarket Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.