Seattle July 8 High Temp: Will It Hit Seventy to Seventy-One?

Seattle weather markets compress a lot of meteorological uncertainty into a single number. Right now, traders are pricing the 70-71°F band at roughly one-in-three odds for the July 8 daily high. That is a narrow target in a city where summer temperatures can shift several degrees based on marine push timing, onshore flow strength, and afternoon cloud clearing. The market is pricing uncertainty, not science, and the spread across competing bands tells you exactly how fragile any single outcome is.

The market question asks: what will be the highest temperature in Seattle on July 8? The 70-71°F outcome carries a YES price of $0.33 and a NO price of $0.68, implying a 32.5% probability. The market resolves on July 8, 2026, and total volume sits at $3,154, all of it traded in the last 24 hours. This is a brand-new, thin market, and that has consequences for how seriously to take the current price.

How the Seattle July 8 Temperature Contract Works

This contract resolves YES if Seattle’s official daily high temperature on July 8 falls within the 70-71°F range. The resolution source is Polymarket’s market resolution process, which draws on official weather observation data for Seattle. Ten competing bands are live simultaneously, from 65°F or below up through 84°F or higher.

• YES pays out if the Seattle daily high on July 8 is at or above 70°F and at or below 71°F, per official weather records.
• NO pays out if the daily high lands anywhere outside that two-degree band, whether cooler or warmer.

The NO side holds a 67.5% implied probability. That probability is not a bet that Seattle stays cool. It is a bet that the temperature misses this specific two-degree window, landing in any one of nine other bands instead. With temperature outcomes spread across such a wide range, even the leading band only needs 32.5% of trader conviction to top the leaderboard. The market structure here rewards precision, not direction.

Momentum and Market Signals

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The momentum composite across the one-hour price change of plus 0.5% and a trend score of 53.48 points to mild upward pressure on the 70-71°F band. That signal is modest and consistent with early positioning as forecasts firm up for the July 8 window. No 24-hour change data is available, which reflects how recently this market opened.

Total volume is $3,154, all of it in the last 24 hours. Liquidity sits at $37,737, which is unusually deep relative to volume for a market this young. That liquidity depth suggests automated market-maker activity rather than strong directional conviction from human traders. Volume below $1M means this price can move sharply on any updated forecast or model run before the July 8 resolution deadline.

• The 70-71°F band carries a 32.5% YES probability, the current leading outcome across all ten temperature bands.
• One-hour price movement of plus 0.5% reflects mild upward drift, likely tied to early forecast model alignment.
• Liquidity of $37,737 against $3,154 in volume signals market-maker depth, not organic trader conviction.
• Thin volume means a single large bet or updated National Weather Service forecast could reprice this market quickly.
• The trend score of 53.48 is slightly above neutral, consistent with cautious early positioning rather than a strong directional lean.

Lines Analysis: Seattle’s Marine Climate Makes Two-Degree Bands Hard to Hit

The 70-71°F band leads the market for a reason. Seattle’s July climatology centers on mild, marine-influenced highs. The city’s July average daily high hovers near 75-76°F in recent years, but that average masks significant day-to-day variance tied to the strength of the Puget Sound marine push. When onshore flow dominates, highs stay in the upper 60s to low 70s. When a weak ridge builds and the marine layer retreats, highs can spike into the upper 70s or low 80s. The 70-71°F window sits squarely in the marine-dominated scenario.

The competing bands are the real challenge here. The 72-73°F and 68-69°F bands are structural rivals to the leading outcome. A forecast showing any ridge amplification over the Pacific Northwest would shift probability mass toward 74-75°F or higher. A stronger-than-expected marine push would push mass toward 68-69°F or 66-67°F. Both scenarios leave 70-71°F empty. The specific conditions required to land precisely in a two-degree band are always narrower than they look in a multi-band market.

• National Weather Service Seattle forecasts for July 8 are the single most important data input. Any update shifts probability across all ten bands simultaneously.
• Pacific high pressure positioning determines whether marine air dominates or retreats. A ridge axis north of normal favors cooler outcomes; south of normal favors warming.
• Model disagreement between the GFS and European ECMWF for the July 7-8 period would widen uncertainty and compress probability in any single band.
• Overnight low temperatures on July 7 serve as a proxy for marine layer strength. A cool overnight low suggests a cooler July 8 high.
• Any significant revision to the NWS point forecast for Seattle on July 7 would be the clearest reprice trigger before resolution.

Total volume of $3,154 reflects early-stage positioning. The data at this moment favors the 70-71°F band as the modal outcome, but modal in a ten-way split means something different than in a binary market. Here’s what the measurements are telling us: the forecast window is still wide enough that no single band deserves high confidence.

LINES VERDICT

LEADING BAND, FRAGILE LEAD

The 70-71°F band tops the market at 32.5% because Seattle’s marine climate makes that range the most probable single outcome. But in a ten-way split, leading the pack and being well-positioned are not the same thing.

What the market says: A 32.5% implied probability means traders see this as the most likely single outcome while leaving 67.5% probability distributed across nine competing bands. Volume is extremely thin and price can move sharply before the July 8 resolution deadline.

Key unknown: The July 7 National Weather Service afternoon forecast update for Seattle is the single most important event before resolution. Any shift in the point forecast for July 8 will reprice every band in this market simultaneously.