Highest temperature in London on August 16?

Platform comparison

Market context

The market concerns the highest temperature recorded at London City Airport on 16 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 settlement window closing on 16 August 2026 at 12:00 UTC.

August temperatures in London typically range between 20–25°C, with historical highs occasionally reaching 30°C during heat waves. The Met Office records show that temperatures above 28°C on mid-August dates occur roughly once every five to ten years in the capital. London City Airport's recording station, situated in the Isle of Dogs, tends to register slightly cooler readings than central London due to proximity to the Thames and surrounding water bodies. The current crowd assessment of 0% probability suggests traders are pricing in a scenario where the highest temperature falls below the lowest available resolution bracket, though the specific temperature thresholds for each bracket are not detailed in the market description.

Traders should monitor UK weather forecasts from the Met Office and BBC Weather in the weeks preceding 16 August 2026, as any indication of an exceptional heat event could shift probabilities substantially. Atmospheric pressure systems and jet stream positioning in early August will be critical indicators of whether continental warm air masses reach the British Isles. The resolution hinges entirely on the Daily Observations data from Weather Underground's London City Airport station, making that specific feed the sole arbiter of outcome.

Methodology

This page tracks Highest temperature in London on August 16? 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

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.

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.

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.