Highest temperature in Singapore on August 6?

Platform comparison

Market context

Polymarket has this contract pricing **32°C** as the clear frontrunner at **78%**, with **31°C** next at **15%**, so the market is already leaning towards a fairly ordinary warm day rather than an outlier heat event.[1] For a Polymarket user, that means the **USDC** bid-ask is effectively expressing where traders think the Singapore Changi Airport Station high will land, and the winning **conditional token** pays **$1** if the correct temperature band resolves from the Wunderground reading.[1]

That shape is consistent with Singapore’s August climate, where daytime highs are typically in the low 30s Celsius and monthly forecast tools still cluster around the same band even when rain is in the picture.[2][4][12] Recent historical weather in Singapore also shows that intraday spikes can matter more than the day’s average, but the market’s present pricing suggests traders are not expecting a sharp deviation from the usual tropical range.[7][13] In practical terms, a 0% crowd-implied chance of a “YES” style alternative outcome does not mean certainty; it simply reflects that the current order book is concentrated around the most likely Celsius bracket.[1]

The main catalysts to watch are the day’s actual hourly observations from the resolution source and any shift in cloud cover, showers, or monsoon-driven humidity that could cap or lift the afternoon maximum.[8][9][15] Singapore’s meteorological service has recently flagged drier stretches in the coming fortnight in its advisories, which can matter because reduced rainfall can leave more room for the day’s high to print near the upper end of the usual range.[8] For traders, the key mechanics are straightforward: if the Changi Airport Station maximum on Wunderground settles inside the chosen band before the market closes, the relevant token redeems, otherwise it does not.[1]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

UK Frequently Asked Questions

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.