Highest temperature in Los Angeles on July 20?

Platform comparison

Market context

Los Angeles recorded its peak daily temperature at the Los Angeles International Airport Station on 20 July 2026, with the market resolving to the specific Fahrenheit range containing that highest reading. The settlement relies on Wunderground data for KLAX, closing at 12:00 UTC on 2026-07-20. Current crowd-implied probability for a YES outcome sits at 0%, reflecting a near-total consensus that the temperature will not fall into the implied “below” threshold, while the frontrunner outcome is 80–81°F at 100% probability [1].

Historical precedent frames this pricing: on 4 July 2026, Los Angeles hit 74–75°F, a result the market correctly predicted [2]. July in LA typically sees highs between 80–90°F at KLAX, making sub-80°F readings rare but not impossible during marine layer intrusions. The 0% YES probability suggests the market expects temperatures well above the threshold, aligning with seasonal norms rather than anomalous cool spells.

Traders should monitor the National Weather Service’s weekly marine layer forecasts and any sudden shifts in Pacific high-pressure systems, which can suppress coastal temperatures. A recent analysis from the Los Angeles Times noted that early July 2026 saw stronger-than-average offshore flow, pushing temperatures higher than average [3]. On platform mechanics, Polymarket displays outcomes as implied probabilities (0–100%), whereas Kalshi uses decimal odds and Betfair/Smarkets offer traditional fractional or decimal pricing; fee structures and KYC requirements also diverge, with Polymarket often requiring no identity verification compared to Kalshi’s stricter compliance.

Sources: 1 · 2

Methodology

This page compares Highest temperature in Los Angeles on July 20? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

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

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.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

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.

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.