Highest temperature in Los Angeles on July 22?

Platform comparison

Market context

What changed in the last 24-48 hours is that Southern California moved into a broad heat advisory period, but the Los Angeles Basin itself has still been tracking around the low-to-mid 80s rather than pushing to extreme inland values. The local forecast for Los Angeles around 22 July called for a high near 87-90°F, with current readings in the low 80s and mostly sunny conditions, which fits a warm but not especially aggressive coastal setup.[4][5][7]

That matters because the market resolves off the highest temperature recorded at Los Angeles International Airport on the day, and the available market pricing is heavily concentrated in the 76-77°F band rather than the upper 70s or 80s. The recent climatological context also points to a modest ceiling: the normal maximum for 22 July at LAX is 76°F, while the record for that date is 88°F, so a very hot outcome would require a clear break from typical marine-influenced summer behaviour.[2][3] AccuWeather’s July outlook for Los Angeles likewise clusters daily highs around 86-91°F, suggesting heat is present in the broader region but not necessarily translating into an airport peak above the mid-70s or low-80s.[1]

For traders, the key catalysts are the afternoon sea-breeze pattern, any overnight marine layer or fog lingering into the late morning, and whether the heat advisory strengthens enough to overwhelm the coastal cool-down near LAX.[4][6][8] Forecast updates from the National Weather Service and local outlets are the main items to watch, because they can shift expectations on cloud cover, wind direction and timing of maximum heating; at the moment, the setup still looks more consistent with a constrained airport high than a breakout heat event.[4][6][7]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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.

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 Prediction Today. 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.