Highest temperature in NYC on July 17?

Platform comparison

Market context

New York City faces a mid-July heat check at LaGuardia Airport, where the highest temperature on 17 July 2026 will determine the outcome. The crowd currently assigns a 0% probability to the “YES” side of any specific range, yet the frontrunner is 86–87°F at 35%, with 88–89°F holding 30% [1]. This divergence suggests the market is pricing a narrow band rather than rejecting heat outright, creating a classic favourite-underdog split where the 86–87°F range acts as the favourite and higher bands sit as underdogs.

Historical mid-July readings at KLGA often cluster between 84°F and 90°F, with extremes above 92°F rare but not impossible. The 0% implied probability on the “YES” side likely reflects a misread of the market’s structure: traders are betting on ranges, not a binary heat event, so the 0% is an artefact of how the question is framed rather than a true belief in no heat. Value may sit in the 88–89°F underdog if the consensus overweights the 86–87°F favourite, especially if a late heat surge develops.

Traders should watch the National Weather Service’s 12-hour forecast updates and any heat advisories from the OKX office, which monitor LaGuardia directly [2]. A sudden shift in the 500mb ridge or a late-day sea breeze could swing the day’s peak by 2–3°F, making the 88–89°F range a contrarian angle if the ridge strengthens. With settlement ending at 12:00Z on 17 July 2026, the clock is tight, and real-time Wunderground data will be the final arbiter.

Sources: 1 · 2

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.

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.