Highest temperature in Los Angeles on July 20?

Platform comparison

Market context

Los Angeles is poised to experience its typical mid-July thermal profile, with the market currently pricing the highest temperature at the Los Angeles International Airport Station on 20 July 2026 as almost certainly falling between 80-81°F. The crowd-implied probability for any outcome outside this narrow band sits at 0% YES for the alternative ranges, reflecting a consensus that the city will avoid both a record-breaking heatwave and an unusually cool anomaly. Historical data for late July at KLAX shows average highs hovering near 83°F, with extremes rarely dipping below 75°F or surging past 95°F, making the 80-81°F range a statistically robust favourite rather than a speculative underdog.

Traders should monitor the National Weather Service’s seven-day forecast for Southern California, particularly any emerging signals of a marine layer breakdown or an offshore flow event that could trigger a heatwave. Recent reports from NBC Los Angeles highlight that summer heatwaves in the region often coincide with increased energy demand warnings and the activation of cooling centres, suggesting that atmospheric pressure patterns will be the primary catalyst for temperature deviations [2]. While the current consensus is heavily skewed toward the 80-81°F outcome, value may sit in the 71°F or below range if early-season monsoonal moisture or a persistent coastal low develops, though such contrarian angles remain statistically thin given the seasonal norm.

Sources: 1 · 2

Methodology

We track Highest temperature in Los Angeles on July 20? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

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.

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.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.