Highest temperature in London on June 19?

Platform comparison

Active sub-markets

Market context

London City Airport has already moved into a warm June pattern, with BBC Weather showing a **sunny** Friday and a forecast high of **86°F** at the station, which would put the day well above the sort of value that makes the lower temperature bands relevant.[1] Earlier observations from the same station were still much cooler, around **13°C**, underlining how quickly intraday highs can build once sunshine arrives.[1]

For context, late-June temperatures at London City Airport are usually closer to the mid-to-high teens than the mid-20s, so a market priced at **0% YES** is effectively leaning against an extreme outcome and towards a more ordinary summer reading.[4] The practical reference point is whether the day can hold onto enough warmth long enough for the highest reading before the settlement cut-off, rather than the overnight or early-morning values that often anchor expectations.[1][4]

The main catalyst to watch is the near-term weather forecast rather than any political-style event flow: traders will be focused on the Met Office and BBC updates for whether the sunny, warm outlook persists through the afternoon, alongside any cloud, shower or wind changes that could cap the station high.[1][6] The market’s path is therefore tied to forecast revisions and observed station data at London City Airport, with the resolution source explicitly being Wunderground’s daily high for EGLC on 19 June 2026.[3]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Highest temperature in London on June 19? 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. Trump Prediction routes every trade through to Polymarket — at 0% fees.

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

Where can I trade this market with the lowest fees?

On Trump Prediction, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does it cost to trade on Trump Prediction?

Zero. Trump Prediction routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.