Highest temperature in London on June 17?

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Market context

On 17 June 2026, the highest temperature recorded at London City Airport will fall into one of several defined ranges, with settlement determined by Wunderground's historical weather data for that specific station. The market currently prices all temperature bands at 0% YES across Polygon, meaning traders are either avoiding the contract entirely or the interface is displaying extreme illiquidity; either way, conditional tokens remain available for purchase in USDC at negligible cost, though execution may prove difficult given the apparent absence of counterparty interest.

London's June temperatures have historically clustered between 20–24°C as daily highs, with occasional excursions toward 26–28°C during warm spells. The record high for mid-June at or near London City Airport sits around 28–29°C, set during the 2022 heatwave period. Current pricing suggests the market maker or early traders have assigned vanishingly small probability to any specific outcome, which typically reflects either genuine uncertainty about which band will resolve or a technical issue with market depth rather than a forecast that temperatures will be unusually cold.

The UK Met Office publishes extended forecasts roughly ten days ahead; traders should monitor their June outlook as the settlement date approaches, particularly any alerts regarding high-pressure systems or continental air masses that could drive temperatures above seasonal norms. Wunderground's historical data for EGLC (the airport's ICAO code) is the sole arbiter, so any discrepancy between other weather stations and that source becomes irrelevant once settlement begins on 17 June at noon UTC.

Methodology

This page reviews Highest temperature in London on June 17? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Polymarket Scam? — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Is this market available outside the US?

Polymarket Scam? is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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 Polymarket Scam??

Zero. Polymarket Scam? 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.