Highest temperature in Hong Kong on June 22?

Platform comparison

Active sub-markets

Market context

Hong Kong’s hottest reading on 22 June will be set by the Hong Kong Observatory’s **Absolute Daily Max** for that date, published only after the daily extract is finalised. The current 0% YES price on a temperature-range market mostly reflects that the contract is still unresolved rather than a view that a hot reading is impossible; Hong Kong Observatory has already said 2026 temperatures are expected to be **above normal** overall, which keeps upper-range outcomes live even if the exact intraday high is unknowable this far in advance.[1][9]

For context, Hong Kong has recently seen June heat at levels that would sit near the top of many day-ahead ranges. The Observatory recorded a **June absolute maximum of 35.6°C in 2025**, and the city’s annual outlook for 2026 warned of a high chance of finishing among the **warmest top ten** years on record.[8][9] That matters for reading the market: Polymarket-style markets usually show **implied probability**, while Kalshi and some exchange-style books can present prices as direct contract values or decimal odds equivalents, so a 0% quote on one venue is not always comparable to a listed price on another after fees and spreads.

The main catalysts are meteorological rather than policy-driven: the Observatory’s short-term forecasts, any tropical disturbance, and how much overnight rain or cloud cover suppresses daytime heating. Hong Kong’s seasonal forecast already points to above-normal summer temperatures, but the settlement source is the final daily extract, not private forecasts or live stations, so late swings depend on the Observatory’s official reading window and publication timing.[1] For platform comparison, the practical differences are KYC access, fee treatment, and whether a venue lets UK users participate at all; Betfair and Smarkets tend to quote market prices in exchange terms with commission, whereas prediction-market venues generally embed the spread differently.

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 Kalshi Alternative UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Where can I trade this market with the lowest fees?

On Kalshi Alternative 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.

Is this market available outside the US?

Kalshi Alternative UK 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, Kalshi Alternative 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.