Lowest temperature in Hong Kong on August 8?

Platform comparison

Market context

Hong Kong’s lowest temperature on 8 August 2026 will be the Hong Kong Observatory’s *Absolute Daily Min* for that date, published in the final Daily Extract and measured to one decimal place in Celsius. The market is still unresolved because the Observatory only settles it once the day’s data is finalised, so any intraday volatility or late-night cooling matters more than the midday heat traders tend to focus on. [8][9]

For context, August in Hong Kong is typically very warm and humid, with the Observatory’s 1991–2020 normals showing an average minimum of 26.9°C for 8 August and a mean temperature of 29.0°C. Comparable August data from other weather sources also places typical lows around 27°C, while the historical record low for the month is far below normal, which is why a very low outcome is possible but not common. That gap helps explain why a 0% crowd-implied price can still be misleadingly crisp on platforms that round or bucket outcomes differently: Polymarket often shows discrete outcome shares, whereas Kalshi-style markets and Betfair or Smarkets-style order books may present prices as implied probability or decimal odds, with fees and KYC access varying by venue. [1][7][16]

The main catalyst is the Hong Kong Observatory’s hourly and daily publication cycle, not a forecast headline, because the resolving figure is an observed minimum rather than a modelled estimate. Traders should watch the Observatory’s weather readings through the overnight and early-morning hours, then the Daily Extract page once it is posted; the 3 a.m. HKO bulletin already showed temperatures around 27–30°C across the territory, which is consistent with a high overnight floor rather than a sharp pre-dawn dip. On cross-platform pricing, fee drag can matter more on thinly traded weather contracts: exchange-style books usually embed spread and commission, while some prediction platforms quote all-in prices more directly, so identical views can appear at different odds even before settlement risk is resolved. [14][8][9]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Lowest temperature in Hong Kong on August 8? 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 Robinhood Prediction Markets, 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.

FAQ

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.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

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. Robinhood Prediction Markets has a different geo footprint and routes to Polymarket's order book at 0% fees.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Robinhood Prediction Markets offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.