Highest temperature in Seattle on August 4?

Platform comparison

Market context

The event is the highest temperature recorded at Seattle-Tacoma International Airport on 4 August 2026, which is a single-day weather readout rather than a broad seasonal call. AccuWeather’s monthly outlook for Seattle shows 4 August with a forecast high of 75°F and low of 58°F, while other forecast sites for the same date cluster higher, around the low 80s, underscoring how sensitive this market is to late forecast updates and airport-specific observations.[1][4][6][11]

The current 0% YES is best read as an artefact of the listed outcome bands rather than a literal statement that the airport cannot print a high temperature; Polymarket’s own market page says traders were concentrated in the 80-81°F band with near-certainty, and it also notes that revisions to temperatures within the market window can be considered until the first datapoint for the following date is published.[2] For comparison, Seattle’s August climate is typically warm but not extreme, with long-run averages around the mid-70s Fahrenheit for daytime highs, so a result near 80°F is consistent with a warm summer afternoon rather than an outlier.[7][9]

From a regulatory and access angle, the main practical constraints are distribution and identity checks rather than weather risk. Prediction markets offered to German users can trigger scrutiny under the GlüStV gambling framework, while US-facing venues may also fall within the CFTC’s broader interest in event-contract oversight depending on structure and venue. For this specific market, “no-KYC up to $1,500” means small-stakes participation may be available without full identity verification, but higher cumulative activity or withdrawals can still require KYC, which affects how easily retail traders can enter or scale positions before settlement.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This overview of Highest temperature in Seattle on August 4? reviews the four comparable platforms from a regulatory perspective: which is accessible in your jurisdiction, where KYC kicks in, how the platform is classified by your country of residence. Live probability is the Polymarket mid; comparison columns show regulatory status, KYC thresholds and settlement options for each platform.

Resolution & payout

On Polymarket, resolution runs on-chain via UMA Optimistic Oracle. USDC payout is instant and automatic, with no KYC. Tax treatment depends on your jurisdiction — in the US, gains are usually ordinary income; in the UK, often capital gains. Consult a tax professional for your situation.

FAQ

Is Polymarket legal in my country?

Polymarket is geo-blocked in the US/UK/EU. Actual usage via the Polymarket interface is not possible there. The legal status itself varies — many countries treat prediction markets as a gray area. Polymarket Legal UK has a different geo footprint.

How are winnings taxed?

Tax treatment varies by jurisdiction. In most countries, prediction market gains are treated as ordinary income or capital gains. We cannot provide tax advice — consult a tax professional for your specific situation.

Can I trade anonymously?

Pseudonymously, yes — up to the KYC threshold. Polymarket Legal UK stores an email address and wallet addresses rather than a legal name. Over $1,500 lifetime volume triggers KYC, after which identity is no longer anonymous.

Are prediction markets gambling?

Legally unclear in most jurisdictions. Some interpretations classify them as wagering (gambling regulation applies), others as derivatives (financial regulation applies). There's no global precedent specifically for on-chain prediction markets.

What if regulation changes?

If regulation changes in your jurisdiction (e.g. prediction markets are banned), Polymarket Legal UK would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.