Highest temperature in London on July 7?

Platform comparison

Market context

On 7 July 2026, the real-world event determining this market’s outcome is the highest temperature recorded at London City Airport, measured in degrees Celsius and sourced from Wunderground. A YES share in this prediction market means you believe the temperature will fall within a specific range (for example, 30–31°C), while a NO share means you expect it to be outside that range. Currently, the crowd-implied probability for YES is 0%, suggesting traders overwhelmingly doubt the temperature will hit the range being offered.

Historical data frames this low probability clearly: July is London’s hottest month, with average highs around 22°C (72°F), but recent years have seen spikes into the upper 20s and low 30s. High pressure building across southern England is sustaining warm, mostly sunny conditions into early July 2026, keeping London’s daily maxima in the upper 20s to low 30s Celsius and driving tight clustering of market-implied odds around 30–31°C[1]. Today’s observed high at London City Airport is already 31°C, matching the threshold in question[3], yet the 0% YES probability implies the market expects either a slight dip tomorrow or that the range offered is misaligned with likely outcomes.

Traders should monitor daily Met Office forecasts and high-pressure system movements, as shifts could alter temperatures by several degrees. The Met Office currently predicts a maximum of 28°C with a “feels like” temperature of 28 degrees Celsius for the coming period[6]. Any sudden change in pressure patterns—such as the falling pressure noted today at 1012mb[2]—could signal cooler air arriving. While no specific announcement is scheduled, the dependency on real-time Wunderground data means traders must watch for updates as settlement nears on 7 July 2026.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in London on July 7? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Prediction Market UK, which mirrors 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

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Prediction Market UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.