Highest temperature in London on July 13?

Platform comparison

Market context

A heatwave is currently sweeping the UK, with London City Airport recording a high of 27°C today under sunny skies, yet the market assigns only a 3% probability to temperatures exceeding the upper threshold for this specific range on 13 July 2026[7]. This low implied probability contrasts sharply with historical extremes, as London’s all-time record of 40.2°C was set just four years ago at Heathrow during the July 2022 European heatwave, while recent data confirms 35°C or higher has now been recorded in May, June, and July in the same year for the first time in UK history[3][5].

Traders should monitor the Met Office’s daily heatwave alerts and Wunderground’s hourly updates for London City Airport, as the settlement hinges entirely on the peak reading at EGLC rather than broader London averages[3]. With the settlement window closing at 12:00 UTC today, the market is leaning on the immediate absence of a sustained high-pressure system over the city, despite the broader regional heat; any sudden shift in southerly winds or cloud cover could cap the temperature well below the threshold required for a YES outcome[7]. The current 27°C high suggests the atmosphere is not primed for a record-breaking spike, reinforcing the crowd’s skepticism despite the active heatwave context.

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 London on July 13? 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.

FAQ

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.

Can prediction markets influence election outcomes?

Markets reflect expectations rather than create them. Studies show public-facing markets can anchor expectations, but don't influence the underlying outcome. Political markets are information, not advocacy.

How fast do political markets react to news?

High-liquidity markets move within seconds to minutes. A Trump tweet on the economy can shift the "Trump 2024" market 2-5 points before mainstream media has written anything.

Are political prediction markets legal in my country?

It varies. They sit in legal gray areas in most jurisdictions. Polymarket is geo-blocked from US/UK/EU; some broker frontends have a different geo footprint. Trade only with capital you can afford to lose, and only if you understand the legal status in your jurisdiction.

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.