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 will determine which range this market settles into. The 0% crowd probability suggests traders are pricing in either extreme confidence in a specific outcome or genuine uncertainty about which temperature bracket will materialise. Wunderground's historical data for this station provides the settlement source, with resolution dependent on the single highest reading across the entire calendar day.

London's June temperatures have historically clustered in the 18–24°C range, though extremes do occur. The summer of 2022 saw record-breaking heat across the UK, with London experiencing temperatures above 30°C in early July. However, June typically remains cooler than July, and the City Airport station—positioned near the Thames estuary—often records slightly lower maxima than central London due to maritime influence. Comparable June days at this location have rarely exceeded 28°C in recent decades, making higher ranges less probable statistically.

The Met Office's seasonal outlook and any Atlantic weather patterns developing in early June will shape conditions. A persistent high-pressure system anchored over the UK could drive temperatures into the mid-to-high 20s, whilst unsettled Atlantic systems would suppress readings into the low 20s or below. Traders should monitor weather model consensus from late May onwards, as the 10-day forecast window preceding 16 June will provide clearer indication of whether anomalous heat or typical early-summer conditions will prevail. Current 0% pricing may reflect a specific range being heavily favoured by early traders rather than genuine impossibility of other outcomes.

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 Best Prediction Markets — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

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 Best Prediction Markets?

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

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, Best Prediction Markets 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.