Highest temperature in Los Angeles on August 17?

Platform comparison

Market context

Los Angeles International Airport’s recorded temperature on 17 August is the settlement point, not the broader city forecast or the day-high summary, so the key fact is the highest figure captured in Weather Underground’s Daily Observations table for KLAX. The live market at 0% YES implies participants expect a very low chance that the final reading lands in the resolved range above the current implied band, which is notable given that mid-August Los Angeles often sits in the upper 70s to low 80s Fahrenheit when onshore flow and the marine layer hold.

Comparable August temperature markets in coastal Southern California usually turn on a narrow spread: a few degrees of extra inland heating, weaker sea influence, or a late-morning rise can move the outcome across a bucket boundary. That is why traders tend to watch the station-specific observations, not the headline city number. On-chain, the contract settles in USDC, so the main crypto angle is execution risk rather than directional digital-asset exposure; in stressed conditions, BTC and ETH volatility can still affect collateral appetite and market depth, but there is no direct link to the weather outcome itself.

For catalysts, the only hard dependency is the Weather Underground KLAX observation stream through the settlement window, with the final published daily observation fixing the result once the next day’s first datapoint appears. If the day warms faster than expected after a cool early morning, the top bucket becomes more plausible; if marine air lingers, the lower buckets stay favoured. The current zero-price still leaves room for a late adjustment if the station prints a higher afternoon reading before the cutoff.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

UK Frequently Asked Questions

What does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

How does UMA secure the resolution?

The UMA Optimistic Oracle uses a bond system: a proposer posts a bond, a two-hour challenge window opens. On dispute the losing side forfeits the bond — financial incentive for honest resolution.

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%.