Highest temperature in London on July 14?

Platform comparison

Market context

On 14 July 2026, the highest temperature recorded at London City Airport will fall into one of several discrete ranges, with traders currently pricing all outcomes at 0% probability on Polymarket. The settlement mechanism pulls directly from Wunderground's historical data for that specific station, converting to Celsius via the platform's settings toggle. USDC collateral on Polygon backs whichever conditional token correctly captures that day's peak, making this a straightforward temperature prediction with no ambiguity in the data source.

London's July temperatures have historically clustered between 20–26°C, with occasional spikes above 28°C during heatwaves. The record high for July across the capital sits at 40.3°C (set in 2022), though City Airport's readings tend slightly cooler than central London due to its riverside location. The 2023 and 2024 July periods saw peaks in the 25–28°C range on most days, providing a baseline for assessing which temperature bands carry realistic probability weight. Traders should examine whether the 0% crowd pricing reflects genuine uncertainty about the event or simply thin liquidity in a contract settling nearly two years forward.

The UK Met Office publishes extended-range forecasts quarterly, with summer outlooks typically issued in May and June 2026. Any significant climate pattern shifts—persistent Atlantic blocking highs or cooler maritime influence—would shift the distribution of likely outcomes. Traders monitoring European weather models from spring 2026 onwards will gain signal on whether July conditions favour above-average or below-average temperatures, though single-day precision remains inherently difficult beyond two weeks.

Methodology

This page reviews Highest temperature in London on July 14? 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 PolyGram, which mirrors 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 itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 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 PolyGram 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.