Highest temperature in NYC on July 20?

Platform comparison

Market context

New York City experienced a record-breaking heatwave last week, with July 2026 temperatures shattering historical benchmarks across the East Coast. LaGuardia Airport recorded extreme highs that exceeded records standing for over a century, setting a volatile baseline for traders assessing the July 20 forecast. This recent surge contrasts sharply with the current prediction market, where the crowd-implied probability for any outcome sits at 0% YES, suggesting a potential mispricing or a specific resolution quirk rather than a consensus on cool weather.

Historical data from the 2026 heatwave indicates that mid-July in NYC frequently produces temperatures between 82°F and 83°F, a range the Polymarket frontrunner currently assigns a 100% probability to [1]. Such divergence between the 0% implied probability on this specific contract and the 100% confidence in the 82–83°F range on the broader platform highlights a significant odds discrepancy worth investigating. Comparable cases from previous July heatwaves show that once a record-breaking trend establishes, subsequent days often maintain similar thermal intensity rather than dropping precipitously.

Traders should monitor the National Weather Service’s daily high-temperature forecasts for the New York City area, as these announcements directly influence settlement outcomes. The resolution source relies on Wunderground data from LaGuardia, meaning any discrepancies between official NWS reports and station-specific readings could alter the final result. Recent coverage confirms that the July 2026 heatwave broke records simultaneously across a 500-mile corridor, reinforcing the likelihood of sustained high temperatures rather than a sudden cooldown [2]. Comparing these lines against Kalshi’s weather derivatives offers a clearer view of where the true market value lies.

Sources: 1 · 2

Methodology

This page reviews Highest temperature in NYC on July 20? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to PolyGram, which mirrors the Polymarket order book at 0% fees.

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

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 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.

Do I need to KYC for this market?

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

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.