Highest temperature in Los Angeles on August 18?

Platform comparison

Market context

The market seeks to identify the highest temperature recorded at Los Angeles International Airport on 18 August 2026, with settlement based on Weather Underground's Daily Observations table rather than summary figures. The crowd currently assigns 0% probability to any outcome, suggesting either extreme uncertainty about future conditions or a technical issue with market initialisation.

August represents Los Angeles's warmest month climatologically, with daily highs typically ranging between 27–29°C (80–84°F), though readings regularly exceed 32°C (90°F) during heat waves. Historical data from LAX shows that temperatures above 35°C (95°F) occur roughly once every two to three years in mid-August, whilst readings above 38°C (100°F) remain relatively rare at the airport itself—occurring perhaps once per decade. The 0% implied probability across all temperature bands suggests the market lacks sufficient liquidity or trader participation to establish meaningful odds, making it difficult to identify where consensus sits or where value might emerge.

Traders monitoring this market should track seasonal forecasting models released in the months preceding August 2026, particularly NOAA's Climate Prediction Center outlooks, which typically indicate whether the Pacific region faces above or below-normal temperatures. La Niña or El Niño conditions developing through 2025–2026 could materially influence summer heat patterns. Additionally, any significant atmospheric blocking patterns or heat dome formation reported in late July would provide concrete signals about August 18th conditions, though such forecasts remain unreliable beyond two weeks. The settlement window closes at midday UTC on the resolution date, meaning traders have only partial access to actual recorded temperatures before final settlement.

Methodology

This page reviews Highest temperature in Los Angeles on August 18? 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 Who Will Win, 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.

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 Who Will Win. 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%.