Storm System Will Bring Rain to Connecticut on Sunday
A low-pressure system is forecast to arrive this weekend, bringing the risk of scattered flooding across the state.
Updated on Sept. 19, 2026 in Forecasts
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A storm system will move into Connecticut on Sunday, September 20, 2026, bringing widespread rain to the region. The heaviest downpours are expected during the afternoon and evening hours.
Why it matters
The incoming rain follows a significant weather event on September 13, 2026, when portions of southern Connecticut experienced flash flooding. Given the recent saturation of the ground, even moderate rainfall could lead to isolated or scattered flooding issues.
The Weather Prediction Center has placed much of Connecticut under a slight risk for excessive rainfall on Sunday. This follows a September 13 event where several towns in southern Connecticut recorded 4 to 7 inches of rainfall.
The players
Weather Prediction Center
This federal agency is a branch of the National Weather Service that provides national-scale meteorological guidance and forecasts.
The details
The storm system will develop as moisture streams northward, causing clouds to thicken and winds to shift to an easterly direction. The interaction between this system and a moist air mass is expected to produce rain that may linger into Monday morning.
Timeline
September 13, 2026: Flash flooding impacted parts of southern Connecticut.
September 20, 2026: A storm system arrives bringing widespread rain.
September 21, 2026: Rain may persist until Monday morning.
Seasonal Patterns
The forecast follows the established protocols for the National Weather Service's Excessive Rainfall Outlooks to prepare residents for potential flood risks. This event highlights the ongoing sensitivity of southern Connecticut soil following the extreme 4 to 7 inch rainfall event earlier in the month.
Residents should monitor local weather alerts, especially if living in areas previously affected by the September 13 flash flooding. Those planning travel for Sunday afternoon or evening should be prepared for potential road hazards caused by scattered flooding.
The takeaway
The combination of recent soil saturation and an incoming storm system necessitates caution regarding potential flood development. Checking local drainage conditions around your property before Sunday can help mitigate the impact of the predicted rainfall.
Further reading
For more on expected weather patterns, visit Connecticut Forecasts.
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