Lowest temperature in Hong Kong on July 31?

Platform comparison

Market context

Hong Kong’s **lowest temperature on 31 July** will be set by the Hong Kong Observatory’s daily minimum reading, which is typically taken from the city’s main climate record rather than from a neighbourhood forecast. July is normally one of Hong Kong’s hottest months, with the Observatory’s 1961–1990 normals putting the mean daily minimum for 31 July at 26.2°C, and July averages around 28°C for the month as a whole.[2][8]

That seasonal backdrop helps explain why the market’s current **2%** implied YES price sits in the extreme tail. The Observatory’s own July rankings show the highest monthly minimum temperatures are usually in the mid-20s Celsius, with 26.3°C the record monthly minimum for July and 25.9°C the second-highest; by contrast, a settlement outcome in the range implied by the current price would require an unusually cool reading for midsummer Hong Kong.[6][9] Comparable late-July observations also point the other way: in 2023, July finished exceptionally hot, and even after showers on 31 July the weather improved with sunny periods during the day.[3]

For traders, the main catalyst is not a campaign-style announcement schedule but the **day-of weather pattern**: overnight cloud, rain bands, and any tropical-system influence between now and the Observatory’s final extraction. The settlement source will be the Hong Kong Observatory’s “Daily Extract” once finalised, and the market cannot resolve until that publication appears.[1] In practical terms, the key dependency is whether convective rain or a broader trough suppresses the pre-dawn minimum, as opposed to the more common July set-up of humid, warm nights; recent reporting on Hong Kong’s summer heat has also underlined how quickly temperatures can rebound after short-lived rain.[5]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Lowest temperature in Hong Kong on July 31? 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

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.

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.

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.

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.