Highest temperature in NYC on July 1?

Platform comparison

Market context

The real-world event driving this market is the highest temperature recorded at LaGuardia Airport on 1 July 2026, measured in degrees Fahrenheit. With the crowd-implied probability for a specific outcome sitting at 0%, traders are effectively betting against that range materialising, despite LaGuardia’s historical record of 107°F on 3 July 1966 [1][5]. Recent July peaks, such as 100°F on 29 July 2025 and 100°F on 30 June 2021, suggest that extreme heat is plausible in early July, making a 0% probability for a narrow range appear statistically fragile when compared to the venue’s climatic norms [1].

Traders should monitor the National Weather Service’s daily climatological reports and any heat-wave advisories issued by New York state officials, as Governor Hochul recently warned of scorching temperatures surging into the mid-90s this week [3][10]. The 2026 July forecast from AccuWeather indicates daily highs between 81°F and 99°F, providing a baseline against which to gauge whether the market’s 0% probability is mispriced relative to expected conditions [6]. Platform comparisons matter here: Polymarket’s decimal odds structure may offer clearer implied probability signals than Kalshi’s fee-heavy, KYC-restricted model, while Betfair’s liquidity could diverge significantly on thin weather contracts due to differing fee structures and settlement transparency [2].

The settlement window closes on 1 July 2027 at 12:00 UTC, with Wunderground serving as the definitive resolution source for LaGuardia’s daily high [1]. Discrepancies between platforms often arise from how each handles weather data latency; Polymarket’s open architecture allows faster price adjustments to new forecasts than Kalshi’s more rigid compliance framework. As the first heat wave of 2026 approaches, the divergence in implied probabilities across books may widen, reflecting varying risk appetites for extreme weather outcomes in a market where historical data supports high-temperature scenarios [1][5].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in NYC on July 1? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

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.

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.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Polymarket Alternative offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.