Highest temperature in London on June 24?

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Market context

The UK is set to experience its hottest June day on record, with forecasts pushing temperatures above 35°C and potentially nearing 40°C, directly framing the 76% YES probability on the Polymarket contract for London City Airport’s peak heat on 24 June 2026[2]. This market, priced in USDC on the Polygon network using conditional tokens, currently implies a strong likelihood that the station will record 35°C or below, with the 36°C and 37°C ranges attracting significant volume as traders hedge against a record-breaker[1].

Historically, June 1976 set the benchmark at 35.6°C, but recent data shows southern Midlands and Greater London areas already peaking around 36°C to 37°C, comfortably surpassing that old record and suggesting the 35°C threshold is a fragile line for the YES outcome[2]. Yesterday’s NW3 Weather report recorded a maximum of 33.9°C at 17:04, while Kew Gardens hit 26.6°C, indicating variability across the city but a clear upward trend in heat intensity that could push London City Airport past 35°C by midday[4][6].

Traders must monitor the Met Office’s hourly updates for Wednesday and Thursday, as forecasts indicate parts of England could reach 40°C, risking the existing record and potentially shifting the market toward the 36°C or higher ranges[2]. Humidity is expected to persist overnight with temperatures unlikely to drop below 17°C to 22°C, creating a heat-trap effect that could sustain high readings through the settlement window ending at 12:00 UTC[2]. The resolution source, Wunderground, will publish the first data point for 24 June, making the timing of this release critical for on-chain settlement[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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 Legit? 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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Legit? 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.