Highest temperature in London on July 16?

Platform comparison

Market context

The market assesses the highest temperature recorded at London City Airport on 16 July 2026, with the crowd currently assigning zero probability to any outcome exceeding the implied threshold. Today’s conditions show 13°C at the station, with southerly winds and high humidity, suggesting the day has already peaked well below extreme heat levels [2]. The settlement window closes at 12:00 UTC, meaning final data from Wunderground will confirm the day’s maximum once all hourly readings are finalized [1].

Historical July highs at London City Airport rarely breach 30°C, with the most extreme cases occurring during isolated heatwaves like 2019 or 2022. In typical years, mid-July temperatures hover between 20–25°C, making a 0% YES probability consistent with the absence of a forecasted heat dome. The market leans on the lack of any declared heat emergency or meteorological warning from the Met Office, which would be the primary catalyst for a sudden probability shift.

Traders should monitor real-time updates from Wunderground and any late Met Office advisories before the 12:00 UTC deadline. Since the current leading outcome is 74–75°F (approximately 23–24°C) with 100% probability, the market is effectively locked unless an unexpected temperature spike occurs in the final hours [1]. No scheduled political debates or campaign disclosures influence this weather event, so the only relevant catalyst remains the final temperature reading itself.

Sources: 1 · 2

Methodology

This page tracks Highest temperature in London on July 16? across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. For users geo-blocked from Polymarket directly, brokers like Election Predictions UK provide a 0%-fee route into the same order book.

Resolution & payout

Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.

Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.

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.

Which platform has the deepest political liquidity?

Polymarket — by far. US 2024 presidential volume was ~$3.5B vs Kalshi (~$200M) and Betfair (~$120M). Where Polymarket is geo-blocked, brokers like Election Predictions UK route into the same order book at 0% fees.

How fast do political markets react to news?

High-liquidity markets move within seconds to minutes. A Trump tweet on the economy can shift the "Trump 2024" market 2-5 points before mainstream media has written anything.

Which political events have the biggest volume?

US Presidential election, party nominations (DNC/RNC), Senate majorities, individual state outcomes (Pennsylvania, Michigan, Wisconsin), and major European elections. Peak markets reach $50-500M per event.