Highest temperature in NYC on July 23?

Platform comparison

Market context

The decisive event is the highest temperature recorded at LaGuardia Airport on 23 July 2026, with settlement based on the Wunderground daily history page for KLGA. The current crowd view on Polymarket is heavily concentrated in **80–81°F**, priced at **72%**, while **82–83°F** is the nearest alternative at **19%**; on that basis, the contract is behaving like a market that expects a moderate summer high rather than an extreme heat spike.[1]

Historical read-across suggests traders are anchoring to typical late-July New York heat rather than a singular record-setting day. A recent comparison point is the early-July heat across the East Coast, when long-standing records were broken in several cities during a broader 2026 warm spell, showing that the region can overshoot expectations sharply when a heat dome sets up.[2] By contrast, a separate NYC temperature market earlier in July resolved in the low-70s, underlining how quickly these contracts can swing with cloud cover, sea-breeze timing, and the exact airport reading.[3] The fact that this contract is still showing a 0% YES in the prompt’s crowd-implied field, despite Polymarket’s live distribution being centred on 80–81°F, implies a meaningful cross-platform divergence between the headline market and the broader betting signal.[1]

For traders, the main catalysts are the afternoon forecast updates, whether any heat advisory or air-quality messaging changes travel and airport operations, and the timing of the day’s peak temperature at LaGuardia, which can be influenced by coastal flow well before sunset. The key dependency is not a single news release but the evolution of the hourly forecast into the afternoon, when a small shift in wind direction can move the final high by a degree or two and push the result between adjacent bands.[1]

Sources: 1 · 2 · 3

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

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

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's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.