Highest temperature in London on July 20?

Platform comparison

Market context

London City Airport recorded no extreme heat on 20 July 2026, with the day’s highest temperature falling well below thresholds that would trigger a “YES” outcome for any elevated range. The settlement source, Wunderground, confirms the peak was modest, aligning with the crowd-implied 0% probability for higher ranges and reflecting typical mid-summer conditions for the capital rather than a heatwave event [1].

Historically, July highs at London City Airport rarely exceed 30°C unless a sustained continental airflow is present; the last significant spike occurred in 2022 during the UK’s record-breaking heat period, when temperatures briefly hit 38°C at nearby Heathrow. In contrast, the past five Julies averaged 22–24°C at EGLC, making a sudden jump to 35°C+ without prior atmospheric warning statistically anomalous [2].

Traders should monitor the Met Office’s weekly heat risk bulletins and the 5-day European Centre for Medium-Range Weather Forecasts (ECMWF) ensemble runs for any emerging high-pressure systems over southern England. A sudden shift in the jet stream or a confirmed Saharan air intrusion would be the primary catalyst for a probability spike, though no such signal has appeared in recent forecasts as of 21 July 2026.

Sources: 1 · 2

Methodology

Football-specific comparison page for Highest temperature in London on July 20?. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi (US-focused) or Manifold (play-money).

Resolution & payout

Sports markets typically settle on official final-whistle plus league confirmation. Polymarket uses UMA Optimistic Oracle with a source URL per contract — usually official league data feeds or ESPN/Soccerway. Two-hour dispute window, then smart-contract payout in USDC.

FAQ

Are prediction markets better than sports betting?

Prediction markets tend toward tighter odds than bookmakers because they use peer-to-peer exchange rather than bookmaker margin. On major matches, Polymarket quotes typically sit 2-5% closer to the true probability model than bet365 or DraftKings.

Which sports markets are available?

Football (soccer) dominates — Champions League, World Cup, Premier League, La Liga, Bundesliga — followed by NFL, NBA, tennis Grand Slams, Formula 1, boxing/MMA. Resolution via official league source confirmation.

How fast do sports winnings settle?

Once the official league outcome is logged in the UMA Oracle (typically 1-2 hours after the final whistle), Polymarket's smart contract triggers USDC payout. To your wallet within minutes.

What's the difference between match odds and outright odds?

Match odds cover a single game ("Bayern beats BVB"). Outright odds are long-term aggregates ("Bayern wins the league"). Outright markets have deeper liquidity; match markets have faster resolution.

Can I import form data and lineups?

This page shows the live Polymarket quote as an implied probability. Form data and lineups must be researched separately via sports data providers (e.g. Soccerway, ESPN, FBref) — we surface the market probability, not the sport analysis.