Highest temperature in San Francisco on August 5?

Platform comparison

Market context

The event is the highest temperature recorded at San Francisco International Airport on 5 August 2026, using the Wunderground daily history page as the resolution source. A 0% YES price implies the crowd sees this exact outcome, or the relevant temperature bin, as effectively unavailable at current prices, which is more likely a reflection of thin demand or market structure than a meaningful forecast of the weather itself.

Historically, San Francisco August highs sit close to the low 70s Fahrenheit, with long-run guidance and forecast products pointing to a mild coastal summer profile rather than extreme heat. That matters because airport readings can differ from neighbourhood perceptions: Bay Area heat often peaks inland, while SFO is moderated by the marine layer, so daily maxima around the low-to-mid 70s are more typical than very hot prints. Recent market pricing on the event has clustered around the low-70s bins, consistent with that climatology and with the National Weather Service-style consensus described in Polymarket’s own event page.[2][9][14]

For catalysts, traders should watch the day’s hourly forecast updates, any marine-layer or offshore-wind changes, and the timing of the final Wunderground observation upload, because settlement depends on the airport station’s recorded maximum rather than citywide forecasts. In regulatory terms, a user in Germany would have to consider the GlüStV’s restrictions on unauthorised gambling-style products, while US participants face a different perimeter because CFTC reach can matter where event-contract structures overlap with derivatives rules. On access, “no-KYC up to $1,500” means a user may be able to transact up to that aggregate limit before identity checks are triggered, which can make entry easier for small positions but does not alter the market’s underlying settlement mechanics.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This overview of Highest temperature in San Francisco on August 5? 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.

UK Frequently Asked Questions

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.

Is Polymarket regulated by the UKGC?

No. Polymarket is not licensed by the UK Gambling Commission (UKGC). It is a decentralised prediction market operated under US regulation. UK traders can use it but do not benefit from UKGC dispute resolution or player protection requirements.

What are the HMRC tax rules on Polymarket profits for UK traders?

Polymarket profits are treated as cryptocurrency disposal events by HMRC. Each USDC settlement is a taxable event subject to Capital Gains Tax (CGT). For 2026/27, the CGT rate is 18% (basic rate) or 24% (higher rate). The annual CGT exemption is £3,000. Report via HMRC Self Assessment if your total crypto gains exceed £3,000 or proceeds exceed £50,000.

Does Polymarket KYC apply to UK users?

Yes. Polymarket requires KYC (Know Your Customer) verification for all users, including UK residents. You must provide a government-issued photo ID and a selfie. The process typically takes 5–10 minutes via their ID verification provider.

What is the legal difference between Polymarket and Betfair Exchange for UK traders?

Betfair Exchange is UKGC-licensed, meaning UK consumer protections apply and winnings are typically tax-free. Polymarket is not UKGC-licensed — it operates under decentralised blockchain rules. Profits from Polymarket are subject to HMRC CGT as crypto disposals. Choose based on your regulatory preference and tax situation.