Highest temperature in London on August 1?

Platform comparison

Market context

London’s temperature on 1 August is the relevant real-world variable, and the market is effectively asking where the day’s highest reading at London City Airport will land once the full day’s observations are in. The crowd is currently concentrated around **26°C**, with **25°C** and **27°C** the nearest alternatives, so the market is reading as a fairly tight single-degree call rather than a broad weather range.[1]

That is consistent with London’s early-August climate, where average highs are typically in the low-to-mid 20s Celsius and the day can occasionally run a little hotter, but usually not by much.[2][4] Historical extremes show that August can produce much higher spikes in exceptional heatwaves — London has seen 38°C-plus August temperatures in the wider region — yet those are outliers rather than the norm, which helps explain why the market is clustering near the mid-20s rather than pricing a larger surge.[7][8][11]

For traders, the main catalyst is still the official weather guidance rather than political-style calendar events: any shift in forecast highs, cloud cover, or the timing of peak warmth would matter more than the morning start to the day. The market description points to the London City Airport station and Wunderground as the settlement source, so the key watchpoint is how the reported maximum evolves before the daily record is finalised; current crowd pricing is leaning on the latest forecast consensus that keeps London near 26°C, with only limited upside or downside spread.[1]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Highest temperature in London on August 1? across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. For users geo-blocked from Polymarket directly, brokers like Election Predictions UK provide a 0%-fee route into the same order book.

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.

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.

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.

Which political events have the biggest volume?

US Presidential election, party nominations (DNC/RNC), Senate majorities, individual state outcomes (Pennsylvania, Michigan, Wisconsin), and major European elections. Peak markets reach $50-500M per event.