Highest temperature in Seattle on July 16?

Platform comparison

Market context

Seattle’s highest temperature on 16 July 2026 will be recorded at Seattle-Tacoma International Airport, with the market resolving to the Fahrenheit range containing that peak. Historical July data shows daytime highs typically reach 24°C (75°F), though recent early-July 2026 patterns in the Pacific Northwest have been mild, with variable skies and no extreme heat expected [2][4]. The current 0% implied probability for a YES outcome on any specific range appears inconsistent with Polymarket’s frontrunner, which assigns 68% to 64–65°F and 19% to 66–67°F, suggesting the crowd expects moderate summer warmth rather than extremes [1].

Traders should monitor daily Wunderground updates for KSEA, the official resolution source, and watch for any sudden shifts in marine air influence or cloud cover that could suppress temperatures below typical July averages [1][4]. Unlike Kalshi’s decimal odds or Betfair’s spread-based pricing, Polymarket uses implied probability percentages, while Smarkets and Betfair apply lower fees but require stricter KYC; this divergence affects liquidity and execution speed on temperature ranges. With settlement ending 12:00 UTC on 16 July 2026, the key dependency is the final daily high recorded before that cutoff, as even a single degree shift can alter the winning range.

Sources: 1 · 2 · 3 · 4

Methodology

We read Highest temperature in Seattle on July 16? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

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 has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.