Highest temperature in Hong Kong on June 4?

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Market context

The Hong Kong Observatory will record the highest temperature in degrees Celsius on 4 June 2026, with settlement based on the absolute daily maximum published in their official Daily Extract. The crowd currently assigns zero probability to any outcome, suggesting either extreme uncertainty about temperature ranges or insufficient liquidity to establish meaningful odds.

Hong Kong's June climate sits at the threshold of summer intensity. Historical data shows early June temperatures typically peak between 28–32°C, with extremes occasionally reaching 33–34°C during heat waves. The 0% implied probability across all ranges appears disconnected from seasonal norms; even conservative estimates would expect the daily maximum to fall within established historical bounds rather than outside them entirely. This disconnect suggests the market may lack sufficient trader participation to calibrate realistic odds, or the range brackets themselves may be misaligned with what the Observatory typically records.

Traders should monitor the Hong Kong Observatory's seasonal forecasts released in May 2026, which will signal whether atmospheric conditions favour above or below-average temperatures for early June. The broader Western Pacific monsoon pattern—particularly whether the southwest monsoon establishes early—will influence whether June 4 experiences typical early-summer heat or cooler conditions. Any significant tropical cyclone activity in the region during late May could suppress temperatures, though such systems typically bring rain rather than extreme heat. Settlement depends entirely on the Observatory's publication schedule; delays in releasing the Daily Extract would postpone resolution beyond the stated window.

Methodology

We track Highest temperature in Hong Kong on June 4? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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 does it cost to trade on Who Will Win?

Zero. Who Will Win routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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, Who Will Win 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.