Highest temperature in Los Angeles on August 9?

Platform comparison

Market context

Los Angeles International Airport is the source that will decide this market, and the key practical point is that Weather Underground’s daily observations table, not the summary high/low, is the settlement basis. By the end of the session, the airport’s observed maximum is what matters, so traders are really betting on a very specific sensor reading rather than a broad citywide heat impression. Recent station data already point to a relatively restrained coastal profile: Weather Underground’s KLAX time series showed readings around the high 70s on 9 August, while the National Weather Service’s climate report for the area listed an 84°F normal maximum for that date at downtown Los Angeles, with a record of 100°F. [12][1]

That makes the current 0% YES price look consistent with the broader Los Angeles August pattern, where the airport is usually cooler than inland neighbourhoods and heat records tend to be set away from the coast. Comparable recent coverage has also shown how widely temperatures can diverge across the basin even on the same day: KTLA reported record highs in the valleys and Inland Empire while LAX only reached 82°F in one heat episode, underscoring how the airport often sits in a lower band than the citywide headlines suggest. [13] In prediction-market terms, this kind of contract usually moves only when station observations break out of the expected range, rather than when general forecast chatter turns hotter.

The main catalyst to watch is the final Weather Underground observation set for KLAX, since the market will not care about forecast highs once the day’s observations are locked in. Traders should also watch National Weather Service updates and any late-day marine-layer or sea-breeze changes, because coastal inversion patterns can cap the airport temperature even when inland Los Angeles stays warm. AccuWeather’s August outlook had 9 August near 89°F for Los Angeles generally, but that is a city forecast rather than the station-specific resolution feed, so it only matters indirectly as context. [2][12][3]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Political prediction markets differ structurally from sports betting: thinner liquidity, longer settlement windows, higher sensitivity to single news events. This page shows the live Polymarket quote for Highest temperature in Los Angeles on August 9? plus platform attributes for the three reference venues, so you can see at a glance where the deepest market for this question sits.

Resolution & payout

Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.

Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.

UK Frequently Asked Questions

How accurate are political prediction markets?

Historically more accurate than polls. Polymarket's Brier score on US 2024 elections was ~0.11 — better than 538 (~0.14) and every mainstream poll. Markets aggregate information with real skin in the game.

What resolution source is used for elections?

Polymarket defines the source per contract — usually Associated Press (AP Race Call), Reuters or the official electoral commission. The source is stated in contract details before the market opens.

Which platform has the deepest political liquidity?

Polymarket — by far. US 2024 presidential volume was ~$3.5B vs Kalshi (~$200M) and Betfair (~$120M). Where Polymarket is geo-blocked, brokers like Trump Prediction route into the same order book at 0% fees.

Why do Polymarket and Kalshi differ on elections?

Kalshi must follow CFTC compliance — strict definitions, clear resolution sources, US citizens only with KYC. Polymarket operates globally without CFTC oversight — deeper liquidity, but also higher regulatory risk.

Are UK election prediction markets available from the UK?

Yes. Betfair Exchange and Smarkets offer UKGC-regulated UK election markets (seat counts, party share, constituency results). Polymarket also lists UK election contracts with deeper global liquidity. Betfair winnings are typically tax-free for UK individuals; Polymarket profits are subject to HMRC CGT.