Highest temperature in Seattle on July 16?

Platform comparison

Market context

Seattle-Tacoma International Airport is expected to record a peak temperature on 16 July 2026, with the crowd heavily favouring the 64–65°F range at a 68% implied probability, while the 0% YES price on the highest-temperature binary suggests traders view extreme heat as virtually impossible [1]. Historical July data for Seattle shows daytime highs typically reaching 24°C (75°F), though recent forecasts indicate a cooling trend as a Pacific cold front moves in, potentially suppressing peaks to the moderate 24–26°C band seen in average years [2][3]. The current market pricing aligns with this moderation, diverging from the 2021 heat dome event that pushed Seattle to 108°F, a scenario now deemed unlikely by the consensus.

Traders should monitor the progression of the incoming cold front and any updates from local forecasters regarding its timing, as a delay could briefly elevate temperatures before the drop [4]. On platform mechanics, Polymarket displays this as decimal odds or implied probability (68% for 64–65°F), whereas Kalshi and Betfair typically quote decimal odds (e.g., 1.47) and require stricter KYC, while Smarkets offers lower fees but operates under different regulatory constraints. The divergence in fee structures and identity verification thresholds means liquidity and slippage may vary significantly between these books for this specific weather event, with Polymarket currently showing the deepest concentration on the moderate range.

Sources: 1 · 2 · 3 · 4

Methodology

This page compares Highest temperature in Seattle on July 16? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi Alternative UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Kalshi Alternative UK has a different geo footprint and routes to Polymarket's order book at 0% fees.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi Alternative UK offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.