Highest temperature in Seattle on August 4?

Platform comparison

Market context

Seattle’s highest temperature on 4 August will be set by the reading at Seattle-Tacoma International Airport, so the market is really about whether the day’s top airport observation lands in a specific Fahrenheit band. The crowd-implied 0% YES suggests traders see the current bin as effectively unattainable, but that can change quickly if the airport reaches a short-lived afternoon peak or if later data revisions alter the final daily high.

On seasonal context, Seattle’s August climate is usually mild rather than extreme: long-run August averages sit around the upper 70s Fahrenheit, with AccuWeather showing an expected high of 75°F for 4 August and 58°F for the low, while WeatherSpark places typical August daytime highs near 77°F.[1][7] Comparable retail prediction-markets sources also pointed to a high in the low 80s for 4 August, with one listing 83°F for Seattle and another describing the leading bins around 82–85°F, which frames a 0% print as a strong statement that the market is pricing well below the expected summer range.[4][3]

For accessibility and regulatory context, German users should note that Germany’s Glücksspielstaatsvertrag (GlüStV) can treat some online wagering and market participation as gambling-adjacent activity, so the practical availability of this contract may depend on local platform controls rather than on the weather event itself. In the US, CFTC reach matters because federally regulated event contracts can be affected by commodity and derivatives rules even when the underlying is meteorological, and “no-KYC up to $1,500” typically means a user can access limited trading volume without full identity verification until cumulative activity exceeds that threshold, which broadens access for small positions but does not eliminate venue, residency, or compliance checks.

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. Is Kalshi Legal in California 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.

What happens during a tax audit?

You're responsible for documenting your trades. Is Kalshi Legal in California exports a full transaction history (CSV/PDF) for tax reporting. In an audit you'll need to present these documents.

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), Is Kalshi Legal in California would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.