Highest temperature in London on August 13?

Platform comparison

Market context

The market concerns the highest temperature recorded at London City Airport on 13 August 2026, with settlement based on the Daily Observations table from Weather Underground rather than summary figures. The 0% crowd probability reflects the market's current state ahead of the 2026 date, when actual meteorological data will determine the outcome.

August temperatures in London have historically ranged between 20°C and 28°C, with extremes occasionally breaching 30°C during heat waves. The Met Office's thirty-year climate average for mid-August in London stands at approximately 23°C, though the record high for any August day in the capital reached 40.3°C in 2022. This historical context suggests most temperature outcomes fall within a predictable band, though climate variability and occasional heat events remain material factors. Traders assessing this market should reference the UK Climate Projections and recent August temperature distributions across the 2010–2025 period to calibrate expectations around the range boundaries.

The primary catalyst affecting this market's resolution will be actual weather patterns in August 2026, which remain unknowable at present. Traders should monitor seasonal forecasting updates from the Met Office and European Centre for Medium-Range Weather Forecasts as summer 2026 approaches, particularly any signals regarding heat wave likelihood or anomalous atmospheric conditions. The specificity of the resolution source—Daily Observations data from Weather Underground at London City Airport rather than alternative stations or summary tables—means traders must verify the exact measurement methodology and station location to avoid settlement disputes.

Methodology

This page tracks Highest temperature in London on August 13? 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 Trump Prediction 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.

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.

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 Trump Prediction route into the same order book at 0% fees.

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.

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.