Lowest temperature in Hong Kong on August 5?

Platform comparison

Market context

Hong Kong’s **lowest temperature on 5 August 2026** will be set by the Hong Kong Observatory’s final “Absolute Daily Min (deg. C)” in the Daily Extract, measured to one decimal place. On Polymarket, the current book shows 27°C as the dominant outcome at around 96%, with 26°C much lower at about 5%, while the market cannot settle until the Observatory publishes the final daily data. [1][7]

That pricing is consistent with Hong Kong’s mid-summer climatology, where overnight minima are often held up by humid monsoon air, cloud cover and showers. A useful comparator is 5 August 2025, when the Observatory said persistent rain pulled the monthly low to 24.0°C, showing that rain-band days can still break a sticky summer baseline if convection arrives early enough. By contrast, the current market is effectively saying a one-degree miss from 27°C is unlikely, which matters because this event resolves by exact temperature bucket rather than a broad weather impression. [16][1][6]

For platform comparison, Polymarket quotes are displayed as implied probability, while Kalshi and Betfair-style venues typically show decimal or price formats that traders convert mentally into probabilities. That can make a 96%/4% book look tighter or looser depending on fee treatment and spread, especially where taker costs, maker rebates and payout conventions differ. The main catalysts now are the Hong Kong Observatory’s published daily readings and any late revisions to the Daily Extract; Polymarket’s contract page says post-publication revisions to temperatures in the market’s timeframe are ignored for resolution. [1][7]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Lowest temperature in Hong Kong on August 5? 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

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.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

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.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.

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.