Highest temperature in San Francisco on August 13?

Platform comparison

Market context

San Francisco's highest temperature on 13 August 2026 will be measured at the airport weather station and recorded in Weather Underground's Daily Observations table. The settlement mechanism prioritises this granular dataset over the summary 'Day High & Low' figure, which can occasionally diverge due to timing or station-specific calibration. The current 0% crowd probability suggests traders expect temperatures to fall outside the uppermost range bracket, though August in the Bay Area typically sees highs between 70–85°F, with occasional excursions into the low 90s during heat events.

Historical August temperatures at San Francisco International Airport show a median high near 73°F and a 90th percentile around 82°F. Extreme heat days—those exceeding 90°F—occur roughly once every three to five years in August at SFO. The 2023 and 2024 summer seasons featured several days above 85°F but few sustained heat waves at the airport location, which sits in a marine-influenced microclimate cooler than inland Bay Area zones. Traders should note that the specific station location and measurement protocol matter; SFO's proximity to the Pacific moderates temperatures compared to downtown San Francisco or the East Bay.

Regulatory access to this market depends on jurisdiction. Under German GlüStV rules, prediction markets operating within EU scope require licensing; US CFTC oversight applies to derivatives contracts but prediction markets with no-KYC thresholds up to $1,500 per user typically operate in a grey zone absent explicit enforcement action. For UK-based traders, the Gambling Commission's classification of prediction markets remains unsettled, though most platforms require basic identity verification. Weather forecasts from the National Weather Service and local meteorological alerts issued in early August 2026 will be the primary catalysts affecting trader positioning.

Methodology

This overview of Highest temperature in San Francisco on August 13? 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 Tax 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.