Lowest temperature in Hong Kong on August 9?

Platform comparison

Market context

Hong Kong’s lowest temperature on 9 August 2026 will be the Hong Kong Observatory’s *absolute daily minimum* in degrees Celsius, published later in the daily extract and measured to one decimal place. The market is therefore about a single official figure rather than a day-ahead forecast, which is one reason the current crowd-implied probability can sit at 0% until the Observatory finalises the data.

August in Hong Kong is normally very warm at night as well as by day: the Observatory’s 1971–2000 normals put 9 August at a mean minimum of 26.6°C, and broader August averages are around 27°C overnight, so outcomes in the low 20s are unusual and anything in the teens is exceptional[2][10]. Historical temperature pages for Hong Kong show recent August lows generally in the high 70s to low 80s °F, reinforcing how far this market sits from a cold-snap scenario[1][8]. On Polymarket, Kalshi, Betfair and Smarkets, that sort of event tends to price very differently because some books quote decimal odds while others show implied probability, and fees or commissions can materially alter the effective entry point even when the headline number looks similar.

Traders should watch the Observatory’s schedule for the daily extract release, because the market cannot settle until the 9 August observation is published and any late data corrections are reflected. Platform mechanics matter here: Polymarket-style markets usually display direct implied probabilities, whereas Kalshi and exchange books such as Betfair and Smarkets may show decimal prices and then add commission or fees at settlement or on winnings, so the same temperature range can look cheaper or richer depending on the venue’s display and cost structure. Availability also differs by jurisdiction and KYC coverage, which can affect where this market is actually accessible even if the underlying forecast is the same.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Lowest temperature in Hong Kong on August 9? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi Alternative UK, 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). On-chain settlement clears in minutes — the fastest payout path of the four.

UK Frequently Asked Questions

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Kalshi Alternative UK has a different geo footprint and routes to Polymarket's order book at 0% fees.

Polymarket vs Betfair Exchange: which is better for UK prediction trading?

Betfair Exchange offers UKGC regulation, GBP settlement, and potentially tax-free winnings — but focuses on sports and politics only. Polymarket has deeper liquidity, 0% platform fee, global event coverage, and crypto/geopolitical markets Betfair doesn't offer. For UK traders: Betfair for regulated GBP sports markets; Polymarket for broader, global prediction events.

Is Kalshi available in the UK?

Kalshi is a US CFTC-regulated prediction exchange. UK residents can create accounts but must use USD and US payment methods. Kalshi's product range overlaps with Polymarket but with lower liquidity on most contracts. For UK traders, Polymarket typically offers better prices due to higher global volume.