Highest temperature in Hong Kong on July 31?

Platform comparison

Market context

Hong Kong’s afternoon peak on 31 July will be settled on the Hong Kong Observatory’s final daily maximum, and the market’s 0% YES price makes **below-consensus** a strong favourite by definition. In practical terms, the crowd is treating an exact threshold or banded outcome as highly unlikely, which leaves the clearest value debate around whether late-day heating, haze, or local thunderstorm activity nudges the recorded maximum into a higher band than traders currently expect. July in Hong Kong is normally hot and humid, with the Observatory’s climate statistics showing it as one of the city’s warmest months, and recent coverage has already described July as a record-setting hot month in Hong Kong in recent years.[1][3][16]

Comparable cases suggest the upper tail is not exotic even if it is not the base case. The Observatory reported 31.6°C at its headquarters on a recent hottest day of the year, while a July 2023 weather summary noted 32.2°C as a daily mean on a record day, underscoring that low-30s maxima are a live possibility when conditions line up.[14][8] Against that backdrop, a 0% YES line can be read as an underdog price that may be too low if settlement bands include any outcome from the low 30s upwards, though the favourite remains a more ordinary early-30s reading unless the day turns sharply hotter than the seasonal norm.[4][13]

The main catalysts are the day’s official Observatory readings, especially whether sunshine dominates the afternoon before any sea breeze or convective showers arrive, and whether the final “Daily Extract” is published on time after the settlement window closes.[7][12] Traders should watch the Observatory’s hourly updates and any weather warnings or tropical weather bulletins, because Hong Kong’s maximum temperature can be front-loaded well before sunset, then locked in once cloud, rain, or onshore flow builds later in the day.[7][12] A contrarian angle is that a very hot morning alone does not guarantee the highest band; what matters is whether the city can extend that heat into mid-afternoon, when the daily maximum is usually set.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Who Will Win 2026, which mirrors the Polymarket order book directly.

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

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's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 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.