Highest temperature in Hong Kong on May 23?

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Market context

Hong Kong's maximum temperature on 23 May 2026 will be determined by the Hong Kong Observatory's official daily reading, with settlement contingent on data finalisation in their climate records system. The 0% crowd probability reflects the market's current inability to resolve, as the date lies five months ahead and no observational data exists yet.

May represents late spring in Hong Kong, typically characterised by warming conditions ahead of the summer monsoon season. Historical May maximums at the Observatory average around 29–31°C, with extreme highs occasionally reaching 34–35°C during particularly warm years. The 1998 May maximum reached 34.6°C, whilst cooler Mays have seen peaks near 27°C. These historical bounds establish the realistic range traders should consider when assessing which temperature bracket becomes most probable as the date approaches.

The key dependency for this market is the arrival of actual weather data on 23 May itself, followed by the Observatory's publication of finalised daily records, typically available within days of observation. Traders should monitor seasonal forecasts released in April and early May, which often provide guidance on whether the monsoon transition will favour above or below-average temperatures. The Hong Kong Observatory publishes monthly climate summaries and seasonal outlooks that will inform expectations as spring progresses into the settlement window.

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 PolyGram, 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.

Is this market available outside the US?

PolyGram is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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, PolyGram triggers a quick verification flow that finishes in minutes.