Highest temperature in Hong Kong on July 1?

Platform comparison

Market context

Hong Kong is preparing to record its highest July temperature on 1 July 2026, a date that historically marks the peak of the city’s summer heat. The market currently assigns zero probability to any outcome, reflecting extreme confidence that the temperature will fall within the expected range, though this may stem from a misunderstanding of how temperature ranges are defined in the resolution criteria.

Historically, July is Hong Kong’s hottest month, with the 2026 forecast predicting daily highs between 85°F and 93°F (approximately 29.4°C to 33.9°C), and the city’s record for July 2007 reaching 32.9°C as the highest monthly mean maximum temperature since 1885[1][5]. In 2018, the mean maximum was 31.8°C, and recent data from June 2026 shows a peak of 91.6°F (33.1°C) on 24 June[6][7]. These comparable cases suggest that temperatures on 1 July will likely remain within the 29–34°C band, making the zero probability assignment potentially misplaced if the market interprets “range” too narrowly.

Traders should monitor the Hong Kong Observatory’s daily extract for the finalized “Absolute Daily Max (deg. C)” once published, as this is the sole resolution source[3][8]. No political or campaign-finance catalysts are expected to influence weather outcomes, but the market leans on the observatory’s data release schedule rather than external events. The key dependency is the timely publication of the daily extract, which must be finalized before the market can resolve[3]. According to the Hong Kong Observatory’s climatological page, data for this date will be available once the daily extract is complete[6].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Highest temperature in Hong Kong on July 1? 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

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.

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.