Highest temperature in London on August 2?

Platform comparison

Market context

London’s temperature on 2 August will be set by the daytime maximum at London City Airport, with the market resolving to the bracket containing the highest reading recorded there during the day. The current crowd leans to a **27°C** print, with **26°C** and **28°C** the nearest alternatives, so the live price is effectively expressing a narrow band around a warm but not exceptional summer day.[1]

That distribution is consistent with how London often prices in late-summer warmth: traders usually cluster around adjacent one-degree outcomes when forecasts sit near the low-to-mid 20s and small shifts in cloud cover or sea-breeze timing decide the final high. The market’s 0% Yes reading is therefore not a view on whether it will be hot in an absolute sense, but on whether the observed maximum lands in the exact bucket the market expects, which is why similar weather markets tend to move quickly on modest forecast changes rather than only on major heatwaves.[1][2]

The main catalyst to watch is the Met Office guidance feeding into the intraday forecast path. Polymarket’s market page currently points to strengthening high pressure, light winds and southerly flow as the setup behind the 27°C modal outcome, while broader August temperature guidance for London still leaves room for 26°C or 28°C if cloud breaks earlier or later than expected.[1][2] In practice, traders are leaning on forecast updates rather than any event schedule or political-style catalyst; the key dependency is whether the day stays mostly clear enough for the airport station to reach the upper end of the current range before noon UTC settlement timing becomes relevant.[1]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Highest temperature in London on August 2? 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

For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.

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.

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.

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 Election Predictions UK route into the same order book at 0% fees.

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.