Highest temperature in London on July 15?

Platform comparison

Market context

The market tracks the peak temperature recorded at London City Airport on 15 July 2026, with settlement tied to Wunderground’s daily high for EGLC. Today’s live reading shows 13°C at 09:47 UTC, but the resolution depends on the day’s maximum, not the current snapshot. With the crowd-implied probability for any specific outcome sitting at 0% for the “YES” side of a binary framing, the real signal lies in the distribution across temperature ranges: 28°C is the frontrunner at 57%, followed by 27°C at 22%, indicating the market expects a warm midsummer day despite the cool morning [1].

Historically, London City Airport has recorded highs between 26°C and 32°C on mid-July days in recent years, with 28°C appearing frequently in the 2020–2025 dataset. The current 57% probability for 28°C aligns with this pattern, suggesting the 0% “YES” probability likely reflects a binary misalignment rather than genuine doubt about warmth. Programmatic traders should model this as a range-resolution event, using historical EGLC July 15 maxima to back-test conditional orders that trigger if Wunderground’s hourly data breaches 27°C before noon UTC.

Key catalysts include the Met Office’s 06:00 UTC forecast update and any sudden shifts in southerly flow, which currently sits at 8 mph with 88% humidity [2]. A dry, high-pressure system moving in from the Atlantic could push temperatures toward 29–30°C, while cloud cover or rain would cap the day near 25°C. Traders monitoring this market should watch the Met Office’s daily outlook for EGLC, as a confirmed “warm and sunny” tag typically precedes a 2–3°C rise in the afternoon maximum [3].

Sources: 1 · 2 · 3

Methodology

This page reviews Highest temperature in London on July 15? 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 Kalshi Fees, 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 Kalshi Fees 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.