Highest temperature in Los Angeles on July 22?

Platform comparison

Market context

Los Angeles International Airport’s hottest reading on 22 July will be the settlement figure, and the crowd is already effectively treating the result as locked in, with the **76–77°F** range at **100%** and the lowest bucket at **0%**. That is more consistent with an already-observed daily high than with a live weather gamble, which is why the implied probability is so compressed on Polymarket; by contrast, Kalshi typically shows this kind of contract in **price terms** that map to implied probability, while Betfair and Smarkets usually present a **decimal-odds** style market where the same view would be expressed differently once commission or fees are included.

The main reference point is not a forecast model but the historical distribution of summer highs at KLAX, where late-July afternoons often sit in the mid-70s to low-80s Fahrenheit, moderated by the airport’s marine influence. On that basis, the current 0% YES price for alternative buckets on Polymarket mostly reflects a market that has already identified the day’s maximum rather than a broad disagreement about weather normality. In practical terms, the comparison across books is less about whether the temperature was hot and more about whether each venue’s contract design, fee schedule, and KYC access make it usable for the same trade in the first place.

For traders still checking the setup, the only real catalysts are the official daily high at KLAX and the way Wunderground records it for settlement; there is no material dependency on forecasts once the day has passed. What matters across platforms is execution friction: Polymarket’s binary-style market pricing makes the distribution easy to read, whereas Betfair and Smarkets add commission that can blunt the edge on a near-certain outcome, and Kalshi’s regulated US access plus customer verification can matter more than the headline number when comparing fill quality and eligibility.

Sources: 1 · 2

Methodology

We read Highest temperature in Los Angeles on July 22? 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

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

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.

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. Polymarket Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Polymarket Alternative offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.