Highest temperature in Seattle on August 9?

Platform comparison

Market context

Seattle-Tacoma International Airport’s observed maximum temperature on 9 August is the settlement input here, with the market hinging on the Weather Underground Daily Observations table rather than any headline “Day High & Low” display. Weather Underground’s history page for Seattle shows 8/9/2026 at 68°F / 66°F in the monthly summary, while other weather services for the same day pointed to a forecast or observed high in the mid-to-upper 70s, so the key question for traders is whether the final Daily Observations entry confirmed a temperature band above or below the current crowd’s 0% YES view.[11][12][13]

The probability read-through is shaped by Seattle’s late-summer climatology: August highs are usually modest by US standards, but 9 August has historically produced the month’s standing record of 99°F, and the long-run average for that date is around the upper 70s.[3][5][10] In practice, a 0% implied chance is best treated as a pricing anomaly or stale book rather than a strong meteorological signal, because even a single warm, dry afternoon with weak marine influence can push Sea-Tac into a materially higher bracket.[1][5]

On market access, the regulatory context matters. If the venue is available to users in Germany, GlüStV issues arise because German gambling rules can capture event-based wagering products depending on structure and local availability, so access may be restricted or geoblocked for compliance reasons; in the US, the CFTC’s reach is relevant where a product is structured as a derivatives-style event contract, which is why platform location and legal classification matter for availability.[16] “No-KYC up to $1,500” means a user may be able to use the market and withdraw or transact within that threshold without full identity verification, but it does not guarantee universal access, and higher limits typically trigger KYC checks and any jurisdictional screening that applies to this specific weather market.[16]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This overview of Highest temperature in Seattle on August 9? 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

Do I need to KYC for Is Kalshi Legal in California?

Not for lifetime trading volume under $1,500. Above that threshold, a quick KYC flow kicks in — ID, selfie, approximately 5-10 minutes. The threshold matches FATF travel standards for unregulated crypto platforms.

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. Is Kalshi Legal in California 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.

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.

Is there a withdrawal cap?

No platform-side cap. You can withdraw any amount provided KYC is complete. SEPA bank withdrawals over €15,000 trigger additional anti-money-laundering checks (statutory obligation for all platforms).