Highest temperature in NYC on July 30?

Platform comparison

Market context

Polymarket is pricing the **highest temperature at LaGuardia on 30 July 2026** at **0% YES**, so the market is treating an extreme reading as effectively off the board even though the contract settles against the highest daily observation from Wunderground and not a citywide average. The key mechanic is straightforward: traders post and buy **USDC** on **Polygon**, and the outcome is resolved through the event’s **conditional tokens** once the LaGuardia Airport Station daily high is known.

For context, LaGuardia’s late-July highs are usually well below the sort of values that would move a temperature market into the top brackets. Historical New York City climate data show 100°F on 2 July 2026 at the city monitor, while LaGuardia’s all-time July high cited in weather discussions is 97°F, which gives a sense of how rare a very hot outcome would be at this station. Comparable summer highs in recent New York forecasts and monthly summaries have sat mostly in the upper 80s to low 90s, which helps explain why the crowd can leave the YES side at zero even during a warm spell.[1][3][11]

The main catalysts are the day’s actual forecast path, any late shifts in the regional pattern, and whether thunderstorms, sea-breeze effects, or cloud cover cap the airport reading before the noon UTC settlement window closes. Traders usually watch the National Weather Service City office and commercial forecast updates for changes to the expected peak, especially when heat waves are in play across the eastern US; New York did see a sharp mid-summer heat episode in the broader region in early July 2026, but those episodes do not guarantee a high at LaGuardia on a specific day.[9][10][13]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in NYC on July 30? 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 Kalshi UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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 Kalshi UK. 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.

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.

Do I need to KYC for this market?

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