Where will it rain this weekend (Sep 5 - Sep 6)?
Short Answer
1. Market Behavior & Drivers
- Southern California faces rainfall risk from an atmospheric river starting September 6.
- Global forecast models project general Western U.S. precipitation from tropical moisture.
Current Context
Sources (6)
- 1Atmospheric river targets Pacific Northwest as Tropical Storm Marie boosts California rainfall risk - The Watcherswatchers.news
- 22026-09-02 Time of Issue: 16:31:00 hours IST (Evening)mausam.imd.gov.in
- 3Major Weather Shift Arrives Ahead Of Labor Day Weekend: 5-Day Forecast | Daily Voicedailyvoice.com
- 4El Niño set to become very strong, raising risks of extreme weather into 2027wmo.int
- 5Current Outlookspreview.weather.gov
- 6Extended Forecast Information - National Weather Serviceweather.gov
2. Price Chart
Historical Price (Probability)
3. Significant Price Movements
Notable price changes detected in the chart, along with research into what caused each movement.
Outcome: Phoenix
📉 September 04, 2026: 53.0pp drop
Price decreased from 76.0% to 23.0%
The primary driver for the 53.0 percentage point drop in the "Phoenix" outcome was traditional weather forecasting predicting a dry Labor Day weekend for the metropolitan area. On September 4, 2026, ABC15 reported that the Phoenix area was forecast to remain dry throughout September 5–6, 2026, as moisture shifted westward away from the Valley [1]. The National Weather Service in Phoenix also indicated that while some storm chances existed, they were primarily focused east of the Phoenix metro or in broader south-central Arizona [2].
Social media activity was not a primary driver, contributing accelerant, mostly noise, or irrelevant, as no relevant social media activity was found in the provided research.
Outcome: Austin
📈 September 03, 2026: 57.0pp spike
Price increased from 8.0% to 65.0%
📉 September 02, 2026: 70.0pp drop
Price decreased from 78.0% to 8.0%
📈 September 01, 2026: 74.0pp spike
Price increased from 4.0% to 78.0%
Outcome: Denver
📈 August 31, 2026: 77.0pp spike
Price increased from 4.0% to 81.0%
Sources (18)
- 1FORECAST: Slowly drying out for Labor Day weekendabc15.com
- 2NWS Phoenixweather.gov
- 3Austin weather: We could see tropical downpours Friday. Here’s whenstatesman.com
- 4Routine Forecasts & Productsweather.gov
- 5Will it rain in Central Texas over Labor Day weekend? - United Stateseuropesays.com
- 6Will Russia capture Kostyantynivka by August 31? — Historical market archive | Orrery | Orreryorrery.me
- 77-day forecast | KXAN Austinkxan.com
- 8AFD from KEWXkamala.cod.edu
- 9https://www.nhc.noaa.gov/archive/2026/al05/al052026.public.002.shtmlnhc.noaa.gov
- 10Tropical Depression Edouard Public Advisory (text)nhc.noaa.gov
- 11https://www.nhc.noaa.gov/archive/2026/al05/al052026.public.001.shtmlnhc.noaa.gov
- 12https://www.nhc.noaa.gov/archive/2026/al05/al052026.public_a.001.shtmlnhc.noaa.gov
- 13Colorado sees August dusting of snow | 9news.com9news.com
- 14‘Possible’ snow returns briefly to Summit County with light dusting on Fremont Pass | SummitDaily.comsummitdaily.com
- 15Labor Day weekend forecast: Will weather ruin your outdoor plans?weather.com
- 16WPC's Short Range Public Discussionwpc.ncep.noaa.gov
- 17Drenching severe storm train to shift southward in eastern US into Labor Day weekendaccuweather.com
- 18National Weather Servicepreview-forecast.weather.gov
4. Market Data
Contract Snapshot
Based on the provided page content:
1. YES resolution: A "Yes" resolution is triggered if it rains in the specified city (Austin, Denver, or Atlanta) during the weekend of September 5 - September 6. However, the precise definition of "rain" (e.g., amount, duration) and the official data source for determining it are not provided. 2. NO resolution: A "No" resolution is triggered if it does not rain in the specified city during the weekend of September 5 - September 6, based on the unspecified criteria for "rain." 3. Key dates/deadlines: The market begins on September 5, 12:00 am EDT, and concerns rain events occurring from September 5 to September 6. The maximum payout date is listed as September 7, 2026. 4. Special settlement conditions: The page does not explicitly state any special settlement conditions, nor does it define what constitutes "rain" or the official source used for resolution.
Market Discussion
For the weekend of September 5-6, 2026, widespread rain is forecast for the UK by September 6 [1], and across India, particularly in regions including Jammu & Kashmir, Himachal Pradesh, Uttarakhand, and parts of Uttar Pradesh, with heavy rainfall expected at isolated locations [2][3][4]. In the United States, continued shower and thunderstorm activity is anticipated for the Intermountain West and Rockies, with potential for organized rain spreading across portions of the East/Southeast and mountain regions of Washington [5]. Conversely, the Northeastern US, Maryland, and Virginia are forecast to be mainly dry [6], while a strong El Niño event is driving high forecast uncertainty for potential rain or storm impacts on the US West Coast [7][8][9].
Sources (9)
- 1UK rain alert: Wall of rain to drench country on September 6 - Brit Briefbritbrief.co.uk
- 22026-09-02 Time of Issue: 16:31:00 hours IST (Evening)mausam.imd.gov.in
- 3Government of India Earth System Science Organization Ministry of Earth Sciences India Meteorological Departmentmausam.imd.gov.in
- 4Realised weather during past 24 hours ending at 0830 hours IST September, 2026: Extremely Heavy rainfall (>20 cm) has been recorded at isolated places over Uttarakhand, Jharkhand and Gangetic West Bengal. Very Heavy rainfall (12-20 cm) has been recorded at isolated places over Himachal Pradesh, East Uttar Pradesh, East Madhya Pradesh, Chhattisgarh and Bihar. Heavy rainfall (7-11 cm) has been recorded at isolated places over West Uttar Pradesh, Jammu-Kashmir, Sub Himalayan West Bengal, Arunachal Pradesh, Assam and Nagaland.mausam.imd.gov.in
- 508.21.2026 8.55 AM PDT - WA Weather Risk Outlookweather.gov
- 6Major Weather Shift Arrives Ahead Of Labor Day Weekend: 5-Day Forecast | Daily Voicedailyvoice.com
- 7Daniel Swain: "This is classic manifestation …" - Mastodonmastodon.social
- 8Godzilla El Nino births cyclone triplets - MacroBusinessmacrobusiness.com.au
- 9MyRadar: "Three major hurricanes are spinning across the Pacific at once, creating a scene that looks straight out of The Day After Tomorrow. Meteorologist @willcanowx.bsky.social explains why it’s happening and how Super El Niño factors in. myradar.com/videos/6774" — deer.socialdeer.social
5. Trader Dashboard
6. How are the Pacific atmospheric river and the Midwest cold front expected to influence rainfall in key market cities like Seattle and Chicago for September 5-6?
| Seattle Rainfall Expectation | No significant rainfall expected for September 5-6, 2026 [1] |
|---|---|
| Seattle Precipitation Probability | 30% or less (daytime for September 5-6, 2026) [2] |
| Chicago Chance of Showers | Low (20% on September 6) [3] |
Sources (6)
- 1Seattle Weather Rain Thunderstorms And Labor Day Sunshinehoodline.com
- 2National Weather Serviceforecast.weather.gov
- 3National Weather Serviceforecast.weather.gov
- 4Atmospheric river targets Pacific Northwest as Tropical Storm Marie boosts California rainfall risk - The Watcherswatchers.news
- 5Weather in Chicago, State of Illinois, United States, for September 5 — Temperature, precipitation, windmeteum.ai
- 6September 2026 Daily Weather Forecast for 60601 (Chicago), Illinois – Plan Aheadweathertab.com
7. What do the leading global forecast models, GFS and ECMWF, project for precipitation across the U.S. for the weekend of September 5-6, 2026?
| Tropical Storm Marie Model Projections | GFS projects stronger, more northerly precipitation; ECMWF weaker, more southerly near California (Sept 5-6, 2026) [1] |
|---|---|
| Excessive Rainfall Risk | Marginal Risk for parts of southwestern U.S., including southern California (Sept 6-7, 2026) [2] |
| Western U.S. Precipitation Outlook | Above-normal precipitation across western CONUS (Sept 5-9, 2026) [3][4] |
Sources (6)
- 1Atmospheric river targets Pacific Northwest as Tropical Storm Marie boosts California rainfall risk - The Watcherswatchers.news
- 2WPC's Short Range Public Discussionwpc.ncep.noaa.gov
- 3National Weather Servicemarine.weather.gov
- 4National Weather Serviceforecast.weather.gov
- 5National Weather Serviceforecast.weather.gov
- 6National Weather Serviceforecast.weather.gov
8. How do the rainfall probabilities for Seattle (Pacific Northwest) and New York City (Northeast) compare for September 5-6, given the different weather systems affecting each coast?
| Seattle Daytime Precipitation Probability | 30% (NWS) [1][2][3] |
|---|---|
| NYC Daytime Precipitation Probability | 10-20% (NWS) [4][2][3][5] |
| NYC Nighttime Precipitation Probability | 10% (NWS) [5] |
Sources (5)
- 1National Weather Serviceforecast.weather.gov
- 2News 12 | Hudson Valley | Your Daily Brooklyn Weather Forecasthudsonvalley.news12.com
- 3NYC Thursday Weather Forecast Storms Heat And Cooler Weekendhoodline.com
- 4New York City, NY Hourly Weather Forecast | Weather Undergroundwunderground.com
- 5National Weather Serviceforecast.weather.gov
9. Where can traders find the most reliable, localized precipitation forecast data from the National Weather Service (NWS) for specific market cities like Denver and Austin?
| NWS Official Website | https://www.weather.gov [1] |
|---|---|
| Denver Local Forecast | weather.gov/bou [2] |
| Austin Local Forecast | weather.weather.gov/ewx [3] |
Sources (12)
- 1Get Your NWS Forecastweather.gov
- 27-Day Forecast 39.75N 104.99W - National Weather Serviceforecast.weather.gov
- 3Routine Forecasts & Productsweather.gov
- 4National Weather Serviceweather.gov
- 5National Weather Serviceweather.gov
- 6Local Weatherweather.gov
- 7Area Forecast Discussion - National Weather Serviceforecast.weather.gov
- 8Austin/San Antonio, TXweather.gov
- 9National Weather Serviceforecast.weather.gov
- 10National Weather Serviceforecast.weather.gov
- 11Probabilistic QPFweather.gov
- 12National Forecast Maps - National Weather Serviceweather.gov
10. In what ways is the ongoing 'Super' El Niño event expected to alter typical precipitation patterns for the U.S. during the September 5-6 weekend?
| El Niño Status (as of Sept 4, 2026) | 'very strong' and strengthening [1][2][3][4][5][6][7][8][9] |
|---|---|
| El Niño Historic Intensity Chance | greater than 90% by late 2026 [1][2][3][4][5][6][7][8][9] |
| El Niño Impact on Sept 5-6, 2026 precipitation | Not expected to significantly alter patterns [1][2][3][4][5][10][9][11][12] |
Sources (14)
- 1ENSO: Recent Evolution,cpc.ncep.noaa.gov
- 2Climate Prediction Center: ENSO Diagnostic Discussioncpc.ncep.noaa.gov
- 3El Niño is surging. Months of extreme heat could follow | UN Newsnews.un.org
- 4El Niño set to become very strong, raising risks of extreme weather into 2027wmo.int
- 5El Niño/La Niña Update (August 2026)wmo.int
- 6Climate Prediction Center: ENSO Diagnostic Discussion - NOAAcpc.ncep.noaa.gov
- 7[PDF] ENSO: Recent Evolution, Current Status and Predictionscpc.ncep.noaa.gov
- 8Climate Prediction Center: ENSO Diagnostic Discussioncpc.ncep.noaa.gov
- 9August 2026 – October 2026weather.gov
- 10Official NOAA CPC ENSO Strength Probabilitiescpc.ncep.noaa.gov
- 11Climate Prediction Center - Seasonal Outlookcpc.ncep.noaa.gov
- 12Week34fcstcpc.ncep.noaa.gov
- 13Labor Day weekend forecast: Will weather ruin your outdoor plans?weather.com
- 14WPC's Short Range Public Discussionwpc.ncep.noaa.gov
11. What Could Change the Odds
Key Catalysts
Key Dates & Catalysts
- Expiration: September 09, 2026
- Closes: September 07, 2026
Sources (10)
- 1September 5 Weather: Heavy Rain in Dehradun, Shimla; Flood Alert from Mumbai to Patnaone.news18.com
- 2Atmospheric river targets Pacific Northwest as Tropical Storm Marie boosts California rainfall risk - The Watcherswatchers.news
- 3Six-Hourly Quantitative Precipitation Forecast by WPCweather.gov
- 4Get Your NWS Forecastweather.gov
- 5Probabilistic Hazards Outlook - Climate Prediction Center - NOAAcpc.ncep.noaa.gov
- 6Global Seasonal Climate Update for September-October-November 2026wmo.int
- 7A 'Super El Niño' is expected to squeeze commodities even further...finance.yahoo.com
- 8Here's What the 'Super' El Niño Could Mean for Snowfall Across the US This Wintergizmodo.com
- 9Weather Prediction Markets: How to Trade Climate and Natural...tradealgo.com
- 10Weather predictions - Polymarketpolymarket.com
13. Related News
14. Historical Resolutions
Historical Resolutions: 20 markets in this series
Outcomes: 7 resolved YES, 13 resolved NO
Recent resolutions:
- KXRAINWKND-26AUG29-SFO: NO (Aug 31, 2026)
- KXRAINWKND-26AUG29-SEA: YES (Aug 31, 2026)
- KXRAINWKND-26AUG29-SATX: NO (Aug 31, 2026)
- KXRAINWKND-26AUG29-PHX: NO (Aug 31, 2026)
- KXRAINWKND-26AUG29-PHIL: YES (Aug 31, 2026)