Where will it rain this weekend (Sep 19 - Sep 20)?
Short Answer
1. Market Behavior & Drivers
- Miami and West Palm Beach lead; active tropical cyclones are not expected for the weekend. Newark and New York City expect unsettled conditions, with historically higher September precipitation.
Who Wins and Why
| Outcome | Market | Model | Why |
|---|---|---|---|
| Miami | 81.0% | 81.0% | High humidity often leads to afternoon and evening showers and thunderstorms. |
| Trenton | 47.0% | 47.0% | The proximity to coastal moisture increases the likelihood of rain. |
| West Palm Beach | 78.0% | 78.0% | A moist tropical air mass is expected to bring widespread precipitation. |
| Washington DC | 55.0% | 55.0% | There is a possibility of showers from an approaching weather front. |
| Atlanta | 32.0% | 32.0% | The leading edge of a cold front is expected to bring scattered showers and thunderstorms on Saturday. |
Current Context
Sources (7)
- 1precip.earth — the planet's rain, snow, floods and droughtprecip.earth
- 2Rain forecast, next 15 days — ECMWF ensemble | precip.earthprecip.earth
- 3GLAAM Strengthens, Indicates El Nino Climate Gaining Intensity - Climate Impact Companyclimateimpactcompany.com
- 4Global Seasonal Climate Update for September-October-November 2026wmo.int
- 5U.S. temperature, precipitation, and drought outlook maps for September 2026 | Climate.usclimate.us
- 6Climate Prediction Center - 6-10 and 8-14 Day Prognostic Discussionscpc.ncep.noaa.gov
- 7Get Your NWS Forecastweather.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: Trenton
📈 September 16, 2026: 34.0pp spike
Price increased from 13.0% to 47.0%
Outcome: Atlanta
📉 September 15, 2026: 70.0pp drop
Price decreased from 99.0% to 29.0%
Outcome: Phoenix
📈 September 14, 2026: 54.0pp spike
Price increased from 20.0% to 74.0%
Sources (8)
- 1Damp start but bright finish Friday, timing is everything for NJ's weekend rainwpst.com
- 2Heat, dry weather continues this week; Rain, cooler weather next weekatlantanewsfirst.com
- 3FORECAST: Flood Watch in the Valleyabc15.com
- 4Arizona weather forecast: Storms and highs in the 90s coming to Phoenix | FOX 10 Phoenixfox10phoenix.com
- 5Phoenix Weather Forecast: Storms And Heavy Rain Threaten Wednesdayhoodline.com
- 6Probabilistic Hazards Outlookcpc.ncep.noaa.gov
- 7Severe Thunderstorm Hitting the East Valley; 60 MPH Wind Gusts Possibleiskynews.com
- 8Phoenix Rainfall Indexweather.gov
4. Market Data
Contract Snapshot
This market determines if rain will occur in New York City, Denver, or Minneapolis during the weekend of Sep 19 - Sep 20. It begins on Saturday, Sep 19, 12:00am EDT, with a maximum payout date of Sep 21, 2026. The provided information does not detail the exact criteria for what constitutes a 'YES' (rain) or 'NO' (no rain) resolution, nor does it list any special settlement conditions.
Available Contracts
Market options and current pricing
| Outcome bucket | Yes (price) | No (price) | Last trade probability |
|---|---|---|---|
| Miami | $0.80 | $0.28 | 81% |
| West Palm Beach | $0.81 | $0.28 | 78% |
| Newark | $0.65 | $0.45 | 64% |
| New York City | $0.60 | $0.46 | 60% |
| Boston | $0.66 | $0.39 | 57% |
| Philadelphia | $0.69 | $0.40 | 55% |
| Washington DC | $0.70 | $0.41 | 55% |
| Trenton | $0.75 | $0.55 | 47% |
| Atlanta | $0.34 | $0.77 | 32% |
| Chicago | $0.65 | $0.38 | 65% |
| Minneapolis | $0.55 | $0.52 | 57% |
| Oklahoma City | $0.32 | $0.77 | 39% |
| New Orleans | $0.39 | $0.70 | 30% |
| Houston | $0.16 | $0.86 | 20% |
| Austin | $0.18 | $0.86 | 19% |
| Dallas | $0.19 | $0.90 | 0% |
| San Antonio | $0.23 | $0.84 | 0% |
| Denver | $0.58 | $0.44 | 58% |
| Phoenix | $0.18 | $0.85 | 16% |
| Los Angeles | $0.15 | $0.87 | 18% |
| Seattle | $0.10 | $0.92 | 10% |
| Las Vegas | $0.06 | $0.95 | 5% |
| San Francisco | $0.06 | $0.95 | 0% |
Market Discussion
Localized forecasts for September 19, 2026, indicate a rainy day in Texarkana, Texas [1], while an upper-level trough is expected to bring unsettled weather to the Great Lakes and Northeast during the weekend of September 19-20, 2026 [2][3]. Specifically, eastern New York and western New England are expected to experience more active weather, with widespread showers and thunderstorms particularly likely on Sunday, September 20, 2026 [2][3], amidst broader concerns about a record-breaking El Niño event potentially driving extreme rainfall in the coming months [4][5][6][7].
Sources (7)
- 1Weather in Texarkana, State of Texas, United States, for September 19 — Temperature, precipitation, windmeteum.ai
- 2National Weather Servicepreview-forecast.weather.gov
- 3National Weather Serviceforecast.weather.gov
- 4Jeff Berardelli: "It’s astonishing to see this, even though we saw it coming months ago. White = 10°F + above normal in the El Niño regions. Its immense! In the air, a regional warming of 10° is no big deal. But in the ocean it’s immense! Think about how hard it is/ how long it takes to cool/ heat your pool. 1/" — deer.socialdeer.social
- 5Daniel Swain: "In fact, the odds of "more tha…" - Mastodonmastodon.social
- 6Prof. Eliot Jacobson: "Breaking News! Code: Hot! The Nino 3.4 SST-anomaly is rising fast, now at 2.89°C above the 1991-2020 baseline. The all-time daily peak (3.03°C, Nov. 19, 2015) is within reach in a few days. The Climate 8-Ball is sober, hasn't had a drink, waiting for the Jack of Hearts." — deer.socialdeer.social
- 7Professor Euan Ritchie FAMS: "“In the lifetime of the active scientists working on atmosphere and ocean, we’d never seen anything like this,” - John McBride www.abc.net.au/news/2026-09..." — deer.socialdeer.social
5. Trust Index
“Atlanta” made a sharp jump with almost no trading behind it.
Integrity risk· Thin-volume moves
Market integrity is low (61), but Integrity averages all three scores, so the other two pull it up. Only a critically low score would cap the total.
Includes the cost to trade: a $10,000 order can't be filled here because the order book is too thin.
Weighted blend with hard caps — a critically weak safety pillar, or a severe trading anomaly, caps the total regardless of the rest. Full methodology · About the Trust Index
6. Which developing storm systems are the National Hurricane Center (NHC) and Weather Prediction Center (WPC) tracking that could bring rain to coastal cities like Miami or New Orleans between Sep 19-20, 2026?
| Active tropical cyclones | None in Atlantic as of September 16, 2026 [1][2][3] |
|---|---|
| Tropical cyclone formation expectation | Not expected in next 7 days [1][2][3] |
| Storm systems tracking towards Miami/New Orleans (Sep 19-20, 2026) | None highlighted [2][4][5] |
Sources (5)
- 1https://prod-east-nhc.woc.noaa.gov/cyclones/prod-east-nhc.woc.noaa.gov
- 2https://prod-east-nhc.woc.noaa.gov/text/refresh/MIATWDAT+shtml/160421_MIATWDAT.shtmlprod-east-nhc.woc.noaa.gov
- 3Atlantic Tropical Weather Outlook - National Hurricane Center - NOAAnhc.noaa.gov
- 4Climate Prediction Center - 6-10 and 8-14 Day Prognostic Discussionscpc.ncep.noaa.gov
- 5Probabilistic Hazards Outlookcpc.ncep.noaa.gov
7. What meteorological evidence in the Climate Prediction Center's 8-14 day outlook supports the forecast of fast-moving storms in the Ohio Valley affecting cities like Chicago or Philadelphia around Sep 19-20, 2026?
| Ohio Valley Storm Forecast (Sept 19-20, 2026) | No meteorological evidence for fast-moving storms (Climate Prediction Center) [1] |
|---|---|
| Ohio Valley Precipitation Outlook (Late Sept 2026) | Below-normal precipitation due to strong high pressure (Climate Prediction Center) [2] |
| Source of Confusion | Significant severe weather event in Ohio Valley occurred August 19-20, 2026 [3][4][5][6][7] |
Sources (8)
- 1Probabilistic Hazards Outlook - Climate Prediction Center - NOAAcpc.ncep.noaa.gov
- 2Climate Prediction Center - 6-10 and 8-14 Day Prognostic Discussionscpc.ncep.noaa.gov
- 3August 19-20, 2026 -- Floodingweather.gov
- 4Summary of Severe Thunderstorms on August 19-20, 2026weather.gov
- 508.19.2026 7.45 PM EDT - State of Ohio Briefingweather.gov
- 6National Weather Serviceforecast.weather.gov
- 7Stormy Ohio August brings record rainfall, historic windstorm and...nbc4i.com
- 8Weather in Chicago in September 2026 - Detailed Forecasteaseweather.com
8. How do the expected El Niño effects on the West Coast versus the Gulf Coast translate to different rainfall probabilities for San Francisco and New Orleans in mid-September 2026?
| El Niño Persistence Probability | Greater than 90% through Northern Hemisphere fall and winter 2026-27 (as of Sept 16, 2026) [1][2][3][4][5] |
|---|---|
| San Francisco Rainfall (Sept 19-20, 2026) | Negligible or no measurable rainfall [6][7][8][9] |
| New Orleans Rain Chance (Sept 19, 2026) | 40%, with a decreasing trend to 15% or less [10][11][12] |
Sources (17)
- 1Climate Prediction Center: ENSO Diagnostic Discussion - NOAAcpc.ncep.noaa.gov
- 2Climate Prediction Center - Official NOAA CPC ENSO Probabilitiescpc.ncep.noaa.gov
- 3ENSO: Recent Evolution,cpc.ncep.noaa.gov
- 4September 2026 El Niño Predictions – Geophysical Fluid Dynamics Laboratorygfdl.noaa.gov
- 5Climate Prediction Center - Outlookscpc.ncep.noaa.gov
- 6September 2026 Daily Weather Forecast for San Francisco, California – Plan Aheadweathertab.com
- 7Weather San Francisco in September 2026: Temperature & Climateen.climate-data.org
- 894130 (San Francisco), California Weather Forecast for September 19, 2026weathertab.com
- 9September 2026 Weather - San Franciscoeaseweather.com
- 10September 2026 Weather - New Orleanseaseweather.com
- 11New Orleans, LA Hourly Weather Forecast | Weather Undergroundwunderground.com
- 12New Orleans/Baton Rougeweather.gov
- 13NWS ABQ - El Nino Precipitationweather.gov
- 14Inside this issue:weather.gov
- 15National Weather Serviceforecast.weather.gov
- 16National Weather Serviceforecast.weather.gov
- 17New Orleans Weather in September 2026: what to expect (5.2/10)bestdateweather.com
9. What is the historical precipitation frequency for New York City versus Las Vegas for the third week of September, according to NOAA and NCEI data?
| NYC Sept 3rd Week Rain Events | Regular measurable precipitation events [1][2] |
|---|---|
| Las Vegas Sept Normal Precipitation | Approximately 0.32 inches (monthly) [3] |
| Las Vegas Sept Rain Frequency | Very low, with minimal days of measurable precipitation [3][4] |
10. What do the final El Niño Southern Oscillation (ENSO) forecasts from the CPC and ECMWF for mid-September 2026 indicate for regional precipitation patterns across the United States?
| El Niño Persistence Probability | Greater than 90% (through Northern Hemisphere fall and winter 2026-27) [1][2][3][4] |
|---|---|
| Eastern Equatorial Pacific SST Anomaly | Exceeded +3.0°C [2][4] |
| Seasonal Precipitation Outlook | Above-normal precipitation (across much of the southern and central United States) [3][5] |
Sources (8)
- 1[PDF] ENSO: Recent Evolution, Current Status and Predictionscpc.ncep.noaa.gov
- 2Climate Prediction Center: ENSO Diagnostic Discussion - NOAAcpc.ncep.noaa.gov
- 3Drought Outlook Support Briefingcpc.ncep.noaa.gov
- 4EL NINO /SOUTHERN OSCILLATION (ENSO)cpc.ncep.noaa.gov
- 5ECMWF El Nino-Driven Precipitation Impacts Caused by Super El Nino for DEC/JAN/FEB 2026-27 - Climate Impact Companyclimateimpactcompany.com
- 6Probabilistic Hazards Outlookcpc.ncep.noaa.gov
- 7Climate Prediction Center - 6-10 and 8-14 Day Prognostic Discussionscpc.ncep.noaa.gov
- 8USA & Canada Weather Forecast September 2026: Heat, Rain...pogodnik.com
11. What Could Change the Odds
Key Catalysts
Key Dates & Catalysts
- Expiration: September 23, 2026
- Closes: September 21, 2026
Sources (10)
- 1Outlook for Sunday, September 20 | Severe Weather Outlooksevereweatheroutlook.com
- 2Outlook for Saturday, September 19 | Severe Weather Outlooksevereweatheroutlook.com
- 3National Weather Servicepreview-forecast.weather.gov
- 4National Weather Serviceforecast.weather.gov
- 5precip.earth — the planet's rain, snow, floods and droughtprecip.earth
- 6Rain forecast, next 15 days — ECMWF ensemble | precip.earthprecip.earth
- 7Global Seasonal Climate Update for July-August-September 2026public.wmo.int
- 8Will OpenAI's Astra model be released on September 19, 2026? | Paritypredictparity.com
- 9Will Russia target Kyiv on September 19, 2026? | Paritypredictparity.com
- 10Elon Musk # tweets September 17 - September 19, 2026?polymarket.com
12. Decision-Flipping Events
- Trigger: The National Weather Service Storm Prediction Center reported on September 16, 2026, that severe weather potential for September 19-20, 2026, is extremely low or marginal across the United States [1][2].
- Trigger: As of mid-August 2026, the long-range weather outlook for the weekend of September 19-20, 2026, indicated generally unsettled conditions across parts of the Northeast, with specific rainfall predictions having low confidence and remaining subject to change [3][4].
- Trigger: Global climate trends for the July-September 2026 season feature heightened probabilities for above-normal rainfall across the central and eastern equatorial Pacific, influenced by an ongoing strong El Niño event [5][6][7].
- Trigger: Other regions, including the Greater Horn of Africa, parts of Central America, and the Caribbean, face increased likelihoods of below-normal precipitation during this period [5][6][7].
Sources (7)
- 1Outlook for Sunday, September 20 | Severe Weather Outlooksevereweatheroutlook.com
- 2Outlook for Saturday, September 19 | Severe Weather Outlooksevereweatheroutlook.com
- 3National Weather Servicepreview-forecast.weather.gov
- 4National Weather Serviceforecast.weather.gov
- 5precip.earth — the planet's rain, snow, floods and droughtprecip.earth
- 6Rain forecast, next 15 days — ECMWF ensemble | precip.earthprecip.earth
- 7Global Seasonal Climate Update for July-August-September 2026public.wmo.int
14. Historical Resolutions
Historical Resolutions: 20 markets in this series
Outcomes: 10 resolved YES, 10 resolved NO
Recent resolutions:
- KXRAINWKND-26SEP12-WPB: YES (Sep 14, 2026)
- KXRAINWKND-26SEP12-TTN: YES (Sep 14, 2026)
- KXRAINWKND-26SEP12-SFO: NO (Sep 14, 2026)
- KXRAINWKND-26SEP12-SEA: YES (Sep 14, 2026)
- KXRAINWKND-26SEP12-SATX: NO (Sep 14, 2026)