Highest temperature in Los Angeles on August 18?

Platform comparison

Market context

Los Angeles will experience some temperature reading on 18 August 2026, and this market captures which range that peak will fall into. The contract resolves using Weather Underground's Daily Observations table from Los Angeles International Airport Station—the granular hourly data rather than the summary high-low figures—settling in Fahrenheit. Polymarket currently prices this at 0% YES across all temperature brackets, which reflects the temporal distance to the event and the absence of any meaningful price discovery this far ahead.

August temperatures at LAX historically cluster between 75°F and 85°F, with the airport's coastal location moderating extremes compared to inland Los Angeles basins. The National Weather Service records show August 2023 peaked at 84°F at LAX, whilst August 2022 reached 86°F. The 30-year August average high sits around 79°F. These historical ranges establish the baseline against which outlier scenarios—heat domes or Santa Ana wind patterns pushing readings above 90°F—should be evaluated. The current zero-probability pricing suggests the market has not yet attracted sufficient liquidity or trader conviction to establish meaningful odds on any single bracket.

Traders monitoring this contract should track seasonal climate forecasts released by NOAA in late July 2026, which typically provide 30-day outlooks for temperature anomalies. Any El Niño or La Niña patterns developing through spring and early summer could shift August conditions meaningfully. Additionally, real-time atmospheric pressure systems and ridge formations in early August will be the immediate drivers of whether 18 August experiences typical coastal cooling or anomalous heat. Settlement occurs at 12:00 UTC, which falls mid-morning Pacific time, capturing the day's temperature trajectory before afternoon peaks typically materialise.

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 Alternative UK, which mirrors the Polymarket order book directly.

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 Polymarket Alternative 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%.