Highest temperature in London on July 10?

Platform comparison

Market context

The market hinges on whether London City Airport will record a temperature exceeding the current crowd-implied threshold of 0% YES for a specific high range on 10 July 2026. Historical data confirms July is the hottest month at this station, with average highs reaching 22°C (72°F), while recent records show extreme volatility, including the unprecedented 40°C peak across UK airports in July 2022 and a 34.2°C maximum recorded locally on 8 July 2026. These comparable cases suggest that while average conditions rarely breach extreme ranges, the region remains susceptible to sudden, intense heatwaves that could invalidate the current zero probability.

Traders must monitor scheduled meteorological announcements and emerging climate declarations, particularly any forecasts from the Met Office or BBC Weather indicating a shift toward sweltering heat before the settlement window closes. Recent news from AccuWeather forecasts a high of 30°C (86°F) for Friday 10 July, with conditions described as "very warm" and "mostly sunny," though the current 0% probability implies the market expects this to fall short of the specific resolution range. The market is leaning on the catalyst of a potential late-July heatwave, similar to the intense event in July 2025, which would require immediate verification via Wunderground data to confirm if the threshold is breached.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Political prediction markets differ structurally from sports betting: thinner liquidity, longer settlement windows, higher sensitivity to single news events. This page shows the live Polymarket quote for Highest temperature in London on July 10? plus platform attributes for the three reference venues, so you can see at a glance where the deepest market for this question sits.

Resolution & payout

For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.

FAQ

How accurate are political prediction markets?

Historically more accurate than polls. Polymarket's Brier score on US 2024 elections was ~0.11 — better than 538 (~0.14) and every mainstream poll. Markets aggregate information with real skin in the game.

What resolution source is used for elections?

Polymarket defines the source per contract — usually Associated Press (AP Race Call), Reuters or the official electoral commission. The source is stated in contract details before the market opens.

Can prediction markets influence election outcomes?

Markets reflect expectations rather than create them. Studies show public-facing markets can anchor expectations, but don't influence the underlying outcome. Political markets are information, not advocacy.

Are political prediction markets legal in my country?

It varies. They sit in legal gray areas in most jurisdictions. Polymarket is geo-blocked from US/UK/EU; some broker frontends have a different geo footprint. Trade only with capital you can afford to lose, and only if you understand the legal status in your jurisdiction.

Why do Polymarket and Kalshi differ on elections?

Kalshi must follow CFTC compliance — strict definitions, clear resolution sources, US citizens only with KYC. Polymarket operates globally without CFTC oversight — deeper liquidity, but also higher regulatory risk.