Highest temperature in Dallas on August 6?

Platform comparison

Market context

Dallas reached a late-summer heat peak on 6 August, with the market set to settle off the highest reading recorded in Weather Underground’s Daily Observations for Dallas Love Field, not the summary high shown elsewhere. The crowd is currently pricing **0% YES**, but the market’s own framing means the relevant number is the *observed* station maximum inside the settlement window, with later revisions ignored once the next day’s first datapoint appears. [1]

That zero-implied price is best read against Dallas climate history rather than a single forecast. North Texas regularly posts 100°F-plus afternoons in August, and the official NWS climate pages show multiple years with heavy 100° day counts and extreme summer highs, which is why nearby range markets in this contract family often concentrate around the upper-90s to low-100s outcomes rather than around cooler bands. [8][9][11] For traders, the on-chain angle is straightforward: the position settles in USDC after the data source is final, so basis risk is almost entirely about the station print, not the broader city-wide weather narrative.

The main catalysts are the day-of forecast path, any thunderstorm-driven cloud cover or outflow boundaries, and whether local heating is strong enough to push the Love Field observation into the market’s 100–101°F band. The Polymarket event page cites a National Weather Service forecast for Dallas-Fort Worth International Airport projecting 101°F, while other weather services showed highs in the mid-90s for the same date, illustrating how small forecast differences can matter near a range boundary. [1][2][6] Because settlement depends on the Daily Observations table, traders should watch for the final station trace rather than headline highs, especially if the day’s peak occurs early and is later challenged by a brief afternoon rebound.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

UK Frequently Asked Questions

Why USDC and not ETH or USDT?

USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.

What does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

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%.