Highest temperature in Los Angeles on August 14?

Platform comparison

Market context

Los Angeles will experience some form of peak temperature on 14 August 2026, and this market captures whether that reading will fall into specific Fahrenheit bands. The settlement hinges on the Daily Observations table from Weather Underground's Los Angeles International Airport station—a distinction that matters, since summary figures sometimes diverge from granular hourly data. The 0% crowd probability suggests traders currently expect the eventual high to land outside whichever range this particular option represents, though without visibility into competing platforms' odds structures, the true consensus remains fragmented across Polymarket, Kalshi, Betfair and Smarkets.

Historical August temperatures at LAX cluster tightly. The past decade shows daily highs between 75°F and 85°F in mid-August, with 2015 and 2017 recording peaks near 84°F. Extreme outliers above 90°F are rare in August at the airport itself, though inland Los Angeles County regularly exceeds this. The current zero probability reflects either a range set well outside historical norms or trader positioning that expects cooler-than-typical conditions. Comparing decimal odds across platforms reveals how fee structures shape perception: Kalshi's flat-fee model may price this differently than Polymarket's percentage-based approach, particularly on low-probability events where rounding effects compound.

Traders should monitor National Weather Service forecasts released in early August, which typically gain accuracy within two weeks of the target date. Sea surface temperatures in the Pacific and any tropical systems tracking northward could suppress coastal readings. The resolution window closes at midday UTC on 14 August, creating a hard deadline for final observations; any station maintenance or data gaps would trigger Weather Underground's fallback protocols, which should be confirmed against the market's explicit terms.

Methodology

We read Highest temperature in Los Angeles on August 14? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Robinhood Prediction Markets has a different geo footprint and routes to Polymarket's order book at 0% fees.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.