Highest temperature in Los Angeles on August 9?

Platform comparison

Market context

The real-world event is the peak air temperature at Los Angeles International Airport on 9 August 2026, with the market resolving off Weather Underground’s Daily Observations rather than the headline Day High & Low summary. For a programme-driven trader, that means the live input is the station’s observation stream and the binning logic around the final reported maximum, so the practical task is to watch the daily table for the highest confirmed reading and any late revisions before the next day’s first datapoint locks the result.[2][17]

The current 0% YES crowd view is hard to reconcile with recent Los Angeles heat context. The National Weather Service’s climate report for downtown Los Angeles shows a normal August 9 maximum of 84°F and a record of 100°F, while Weather Service time-series data for KLAX on 9 August 2026 already showed temperatures in the upper 70s to around 79°F during the afternoon, which is consistent with a moderate airport high rather than an extreme spike.[1][8] Comparable August 9 records from Extreme Weather Watch also place the historical upper bound for the date at 98°F, implying that outcomes above the high 90s require unusually strong heat advection, offshore flow, or local compression warming to materialise.[13]

A trader monitoring this programmatically would typically poll the Weather Underground station page for KLAX, compare the daily-observation maximum against the market’s temperature bins, and ignore the broader forecast once the day is underway because settlement depends on observed data, not model output. The main catalysts are therefore not broad “weather headlines” alone, but the timing of marine-layer burn-off, any heat advisories or NWS wording for coastal Los Angeles, and whether midday readings at the airport can push through a higher bracket before the final observation cut-off; local coverage has already noted late-summer heat advisories and record-setting August heat in Southern California, which can matter if conditions shift faster than expected.[4][14]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Review UK, which mirrors the Polymarket order book directly.

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.

UK Frequently Asked Questions

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 Polymarket Review 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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.