Highest temperature in Los Angeles on August 14?

Platform comparison

Market context

The last 24-48 hours have pointed to a fairly ordinary late-summer setup at Los Angeles International Airport: warm, but not extreme. Weather Underground showed Los Angeles at 83°F by 10:04 am PDT on 14 August, with the day forecast to run warmer than the previous day, while the National Weather Service’s climate note put the normal maximum for 14 August at 77°F, implying a modestly above-normal outcome rather than a heat-event spike.[9][8]

That matters for how to read the current 0% implied probability. Daily Observations at KLAX had already reached 79°F by late morning, with recent observations clustering in the upper 60s to upper 70s and no sign of a sharp warm-up regime in the immediate data feed.[14][15] In comparable August cases at KLAX, highs often finish in the upper 70s or low 80s unless offshore flow or a deeper marine-layer break develops; a result above the mid-80s usually needs a clearer inland surge than the current pattern suggests.[8][13]

For the rest of the session, traders should watch the afternoon marine layer, any late-day sunshine break, and whether sea-breeze flow keeps the coast capped near forecast highs. The National Weather Service had no watches, warnings, or advisories in effect for Los Angeles on 14 August, and the main dependency for settlement is the highest figure in Weather Underground’s Daily Observations table at KLAX, not the summary high-low panel.[4][14]

Sources: 1 · 2 · 3 · 4 · 5

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

UK Frequently Asked Questions

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.

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%.