Highest temperature in Seattle on August 4?

Platform comparison

Market context

Seattle’s temperature on 4 August will be set by the highest reading at Seattle-Tacoma International Airport, so traders are really betting on a single afternoon peak rather than the daily average. The market is currently pricing a summer warm-up, with the crowd leaning most heavily to the mid-80s Fahrenheit and only a small share assigned to cooler bands, which is consistent with late-summer highs in the city often landing in the 80s when ridge-driven warmth builds over western Washington.[4][7]

That framing matters because Seattle’s August climate is usually mild by US standards, but short-lived heat spikes are not unusual. AccuWeather’s August view shows early-month highs around 81°F, while WeatherSpark’s August history underscores that the city can sit near the upper 70s to low 80s for much of the month, leaving only a modest margin for hotter-than-normal outcomes.[1][2][13] Compared with those baselines, a 0% implied chance on any one band reflects a fragmented book rather than a firm weather signal, especially when the daily maximum can shift a category with just a degree or two.

The catalyst to watch is the forecast path into the event day: traders will be leaning on short-range National Weather Service guidance, local model runs, and any shift in the ridge over the Pacific Northwest that could push highs above or below the low- to mid-80s cited in current market commentary.[4][7] A recent Polymarket snapshot has the 84–85°F bucket in front, with 82–83°F and 86–87°F next, so any news flow that changes expectations for sunshine, marine air, or inland warming should move the odds quickly.[4]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Political prediction markets differ structurally from sports betting: thinner liquidity, longer settlement windows, higher sensitivity to single news events. This page shows the live Polymarket quote for Highest temperature in Seattle on August 4? plus platform attributes for the three reference venues, so you can see at a glance where the deepest market for this question sits.

Resolution & payout

For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.

FAQ

How accurate are political prediction markets?

Historically more accurate than polls. Polymarket's Brier score on US 2024 elections was ~0.11 — better than 538 (~0.14) and every mainstream poll. Markets aggregate information with real skin in the game.

What resolution source is used for elections?

Polymarket defines the source per contract — usually Associated Press (AP Race Call), Reuters or the official electoral commission. The source is stated in contract details before the market opens.

Can prediction markets influence election outcomes?

Markets reflect expectations rather than create them. Studies show public-facing markets can anchor expectations, but don't influence the underlying outcome. Political markets are information, not advocacy.

How fast do political markets react to news?

High-liquidity markets move within seconds to minutes. A Trump tweet on the economy can shift the "Trump 2024" market 2-5 points before mainstream media has written anything.

Which political events have the biggest volume?

US Presidential election, party nominations (DNC/RNC), Senate majorities, individual state outcomes (Pennsylvania, Michigan, Wisconsin), and major European elections. Peak markets reach $50-500M per event.