Highest temperature in Hong Kong on June 4?

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Market context

On 4 June 2026, the Hong Kong Observatory will record the day's maximum temperature in degrees Celsius. Polymarket currently prices this contract at 0% YES, reflecting extreme confidence that the highest temperature will fall outside whichever range this particular outcome represents. The settlement hinges on the Observatory's published "Absolute Daily Max" figure, measured to one decimal place, appearing in their Daily Extract database after the date closes. Until that official data materialises, the market cannot resolve.

Hong Kong's June weather sits at the threshold between late spring and early summer, with historical daily maxima typically ranging from 28°C to 32°C during this period. The 0% pricing suggests traders are pricing in a specific temperature band as exceptionally unlikely—either an unusually cool day well below seasonal norms, or conversely, an extreme heat event that would rank among the city's hottest June days on record. Historical context matters here: June 2015 saw temperatures exceed 34°C on multiple occasions, whilst cooler Junes have bottomed around 26°C. The current market probability reflects confidence in a narrow outcome rather than genuine uncertainty about whether Hong Kong will experience *some* maximum temperature that day.

Traders monitoring this contract should track the Hong Kong Observatory's seasonal forecasts released in May 2026, which typically indicate whether monsoon patterns or high-pressure systems will dominate. El Niño or La Niña conditions, if active, could shift temperature expectations. The settlement window closes at 12:00 UTC on 4 June, but actual resolution depends on the Observatory publishing verified daily data, which usually occurs within days of the measurement date.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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

Where can I trade this market with the lowest fees?

On Polymarket UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket UK triggers a quick verification flow that finishes in minutes.

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.