Highest temperature in Los Angeles on August 14?

Platform comparison

Market context

Polymarket has this contract at 0% YES, so the market is pricing almost no chance that the Los Angeles International Airport station’s highest Daily Observations temperature on 14 August reaches the specified range. The settlement source matters here: the Daily Observations table on Weather Underground controls, not the day-high summary, which can leave the on-screen headline and the resolveable figure briefly out of step.

For context, LAX’s climatological normal maximum for 14 August is 77°F, with a record maximum of 92°F, so a very hot outcome would still sit within historical bounds but above the usual late-summer pattern. Weather Underground’s history page for KLAX showed only 69°F in early-morning observations on 14 August, while the National Weather Service said there were no watches or advisories in effect, and its local discussion pointed to marine-layer clouds and highs around the 70s on the coast and 80s inland. That kind of setup tends to keep the airport from spiking unless low cloud clears early and the onshore flow weakens.

A trader watching this on USDC-settled, Polygon-based conditional tokens should focus on the next observation updates from LAX and the short-range forecast shifts rather than broader Los Angeles headlines. The key catalysts are whether the marine layer burns off sooner than expected, whether afternoon sea breezes hold down the airport reading, and whether any late revisions from Weather Underground’s daily table change the recorded maximum before the settlement window closes.

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

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.

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 Kalshi 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.

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%.