Highest temperature in London on June 16?

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Market context

On 16 June 2026, the highest temperature recorded at London City Airport Station will fall into one of several defined ranges. The settlement will draw from Wunderground's historical weather database, which logs hourly readings throughout each calendar day. The current crowd probability of 0% for any single outcome suggests either extreme confidence in a particular range or insufficient liquidity across all brackets.

London's June temperatures typically range between 18–24°C, with historical highs occasionally reaching 28–30°C during warm spells. The Met Office's 30-year climate averages show mid-June mean maxima around 21°C; however, the 2022 heatwave and subsequent warm summers have shifted trader expectations upward. Comparable June days at City Airport have produced readings between 15°C and 27°C depending on synoptic patterns. The 0% probability across all ranges may reflect settlement mechanics rather than genuine weather uncertainty—traders may be awaiting range definitions or awaiting confirmation of the exact resolution brackets before committing capital.

Traders should monitor the UK Met Office's extended forecast from early June 2026, particularly jet-stream positioning and Atlantic pressure systems that drive warm continental air into southern England. The North Atlantic Oscillation phase and sea-surface temperatures in late May will signal whether high-pressure systems favour the south. Any official heat-health alerts issued by the UK Health Security Agency in the week preceding 16 June would indicate elevated temperatures. Wunderground's historical data feed remains the sole authoritative source; discrepancies between other weather services and that platform's City Airport readings have occasionally created settlement disputes on comparable markets.

Methodology

This page reviews Highest temperature in London on June 16? 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 Legal UK — 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

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 Legal UK?

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

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Legal UK triggers a quick verification flow that finishes in minutes.

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.