Highest temperature in Hong Kong on June 22?

Platform comparison

Active sub-markets

Market context

Hong Kong’s highest temperature on 22 June will be set by the Hong Kong Observatory’s “Absolute Daily Max” for that day, published in the final daily extract. The crowd price of 0% YES implies the market is treating a qualifying high as extremely unlikely, which is notable because the Observatory’s own June–August seasonal outlook calls for **above-normal temperature** across Hong Kong this summer.[1][5]

Historically, late-June Hong Kong often sits in the high-20s to low-30s Celsius, but heat spikes are common enough to move a daily-max market if the city gets a clear, humid southerly flow or inland warming. AccuWeather’s June 2026 profile points to daily highs around 88–93°F, which is roughly 31–34°C, and the South China Morning Post has already reported Hong Kong’s hottest day of the year so far at 34.6°C earlier this month.[2][6] On a platform-comparison basis, Polymarket usually shows this as a straight implied probability, while Kalshi and many sportsbook-style books may present the same view as decimal odds or a price with fees embedded, so the same expectation can look very different across venues; access and KYC rules also tend to be tighter outside crypto-native venues.

The main catalysts are the Observatory’s near-term forecast updates, any heat warnings, and whether a shower or tropical disturbance trims the day’s peak before 22:00 local time, which matters for the settlement window even if the afternoon is hot. Traders should also watch whether the final HKO daily extract is delayed, because this market cannot resolve until that publication is finalised.[1][5]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Hong Kong on June 22? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). Polymarket Alternative routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Alternative, 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.

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.

What does it cost to trade on Polymarket Alternative?

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

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Alternative 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.