Highest temperature in Hong Kong on May 22?

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Market context

Hong Kong’s hot season is already in swing, and the market is pricing the day’s top reading as a clear favourite to land in the upper bands. With crowd-implied probability at 0% for “Yes” and consensus elsewhere, the useful way to read this is as an underdog set-up: any outcome below the usual late-May peak would fit the current pricing, while a test of the warmer brackets would create the main contrarian risk. Late May in Hong Kong often sits around the high 20s to near 30°C, but the city can still print a sharp midday maximum when sunshine breaks through and winds ease. That leaves the value debate concentrated around whether the top reading stays just under the hotter cut-offs or pushes high enough to challenge the market’s lean.

The historical frame is straightforward: May is normally warm, and the Hong Kong Observatory’s records show that the month can support very high maxima, including a mean maximum above 31°C in the warmest May on record. That does not make a hot print likely every year, but it does mean a sub-30°C cap is not the only plausible outcome if cloud or showers build during the day. For traders, the main dependencies are the Observatory’s afternoon update flow and whether the settled weather pattern holds through the late morning to early afternoon window, since this market resolves off the day’s absolute maximum as finalised in the Daily Extract. AccuWeather’s May outlook still points to seasonal highs around 31–34°C, which supports the warm-side bias, but any coastal breeze, rain band, or earlier cloud cover would favour the under.

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Methodology

This page reviews Highest temperature in Hong Kong on May 22? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at PolyGram — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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 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.

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.