Climate and Weather Kalshi September 22, 2026 Crowd ahead of press
Seattle Braces for Dry September Amid Warm Spell
Rain in Seattle in Sep 2026?
Kalshi prices this Above 1 inch at 97%. The market is more confident than the current reporting.
Seattle is navigating an unusually warm and dry September, with temperatures recently hitting 77 degrees, marking what many anticipate as the warmest day for the remainder of the year. This extended period of clear skies and mild conditions has prompted residents to enjoy what may be their last opportunities for summer activities. The city's weather pattern has remained consistently sunny, with daily temperatures in the 70s, which contrasts with typical late-September conditions. Despite the prevailing dryness, traders on prediction markets are still indicating a strong likelihood of total precipitation exceeding 1 inch at CLISEA in Seattle by the end of September, with 97% on this outcome, even as the forecast suggests continued dry weather.
Background
Seattle's weather in September 2026 has been notable for its persistent warmth and lack of significant rainfall. The city has seen a string of sunny days, with temperatures in the 70s, extending what is typically considered the summer season. This extended dry spell has been a topic of local discussion, particularly concerning the city's usual autumnal shift towards wetter conditions. The question of whether Seattle will receive more than 1 inch of rain by September 30, 2026, is a key point of interest, as the region typically sees an increase in precipitation during this month.
The precedent
- Seattle's average precipitation for September, based on historical data, is typically around 1.5 to 2.5 inches.
- There have been several instances in the past where Seattle recorded less than 1 inch of rain in September, most recently in 2012.
Context compiled by Crowdtells from the public record — verify before relying on it.
What the coverage agrees on
- Seattle has been experiencing unseasonably warm and sunny weather.
- Temperatures have been in the 70s.
- The warm weather is expected to be the last of its kind for the year.
- The period has been conducive to outdoor summer activities.
How outlets frame it
- Emerald City Weather Blog: Emphasizes that a recent 77-degree day was likely the warmest for the rest of the year, signaling an end to the summer-like conditions.
- The Seattle Times: Highlights the current warm spell as the "last chance" for summer activities, suggesting an impending shift in weather.
What to watch
With only about nine days remaining until the September 30 resolution date, the focus will be on any shifts in the forecast that could bring significant rainfall to Seattle. A sudden change in weather patterns, such as an incoming storm system, would be the primary catalyst for reaching the 1-inch precipitation threshold. Continued sunny and warm weather, however, would make achieving this benchmark increasingly challenging.
The numbers behind this
Kalshi prices this Above 1 inch at 97%.
24h -2.0 pts
$23.7K traded · $4.9K in the last day · $8.5K open interest
Resolves on: If the total precipitation at CLISEA in Seattle in Sep 2026 is strictly greater than 1 inches, then the market resolves to Yes.
Pricing Kalshi 97%
Sources
- Seattle’s 77 degrees Thursday was probably the warmest day for the rest of the year emeraldcityweather.com
- Last chance to check off your Seattle summer bucket list activities seattletimes.com
- Seattle weather: Sunny days in the 70s yahoo.com
- Inclement Weather Protocol for Colorado Rapids vs Seattle Sounders coloradorapids.com
- Forecast for 11am Mon Sep 21 kiro7.com
Frequently asked questions
Rain in Seattle in Sep 2026?
Kalshi prices this Above 1 inch at 97%. The market is more confident than the current reporting.
What do the sources agree on?
Seattle has been experiencing unseasonably warm and sunny weather. Temperatures have been in the 70s. The warm weather is expected to be the last of its kind for the year. The period has been conducive to outdoor summer activities.
When does this market resolve?
This market resolves on: If the total precipitation at CLISEA in Seattle in Sep 2026 is strictly greater than 1 inches, then the market resolves to Yes.
How are these odds set?
Prediction-market odds are prices set by people trading real money on the outcome, so the price reads as the crowd’s implied probability — not a guarantee or financial advice.
AI-written briefing grounded in 5 sources and the live market, edited by Samuel Jo. Odds are crowd probabilities, not advice — how this works.