Highest temperature in Hong Kong on June 25?

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Market context

On 25 June 2026, Hong Kong will record its peak daily temperature, a real-world event that determines the outcome of a prediction market where the crowd currently assigns zero probability to any specific range. This date falls within Hong Kong’s hottest month, when the Hong Kong Observatory typically logs absolute daily maxima between 30°C and 35°C, with recent extremes pushing past 34.6°C. The market’s 0% YES probability suggests traders doubt any particular range will resolve, possibly due to uncertainty over final data publication or the narrow resolution bands.

Historical June peaks frame this probability: in 2026, Hong Kong hit 34.6°C on its hottest day so far, while seasonal forecasts for June–August 2026 predict above-normal temperatures and normal to below-normal rainfall[3]. Earlier this year, a mercury spike to 33.7°C triggered an extreme heat warning[5]. These cases show that temperatures regularly breach 33°C, making ranges below 33°C unlikely and those above 34°C plausible. On platforms like Polymarket, traders see decimal odds reflecting this, whereas Kalshi and Betfair emphasise implied probability and stricter KYC, which may limit participation in weather markets with volatile resolution.

Traders should monitor the Hong Kong Observatory’s Daily Extract for the finalized “Absolute Daily Max (deg. C)” once published, as the market cannot resolve until this data appears[4]. Recent UV forecasts confirm high radiation intensity on 25 June, a catalyst for heat spikes[4]. The 2026 seasonal outlook and ongoing heat warnings underscore the risk of temperatures exceeding 34°C. Fee structures and KYC reach diverge sharply across books: Polymarket offers low fees and minimal KYC, while Kalshi and Betfair impose higher barriers, affecting liquidity in weather markets where resolution depends on official climate data.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Hong Kong on June 25? 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 PolyGram, 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). PolyGram 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 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.

What does it cost to trade on PolyGram?

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