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National Weather ServiceConnecticutFlash Flood WarningArchive to October 1, 2026

Flash Flood Warnings in Connecticut

The National Weather Service issued 10 flash flood warnings for Connecticut in 2025 and 19 a year on average in 2008-2025; in 2021-2025 it had the 37th most of any state. 2026 through September: 22, 20% above the average of 18 for those months in 2008-2025. Fairfield was covered most often (110 times since 2008).

How many flash flood warnings does Connecticut get?

10 flash flood warnings for Connecticut in 2025
2040602008: 2020082009: 2820092010: 420102011: 1920112012: 2120122013: 3820132014: 2220142015: 920152016: 620162017: 1320172018: 2720182019: 1220192020: 1220202021: 3220212022: 1120222023: 4720232024: 1820242025: 1020252026: 2220262008-2025 average 192026 through September: 222040602008: 2020082009: 282010: 420102011: 192012: 2120122013: 382014: 2220142015: 92016: 620162017: 132018: 2720182019: 122020: 1220202021: 322022: 1120222023: 472024: 1820242025: 102026: 2220262008-2025 average 192026 through September: 222040602008: 2020082009: 282010: 420102011: 192012: 2120122013: 382014: 2220142015: 92016: 620162017: 132018: 2720182019: 122020: 1220202021: 322022: 1120222023: 472024: 1820242025: 102026: 2220262008-2025 average 192026 through September: 222040602008: 2020082009: 282010: 42011: 192012: 212013: 382014: 222015: 920152016: 62017: 132018: 272019: 122020: 1220202021: 322022: 112023: 472024: 182025: 102026: 2220262008-2025 average 192026 through September: 22

Every flash flood warning that covered part of Connecticut. 2026 is an outline: the year is not over.

The numbers
YearCount
2026 (through September)22
202510
202418
202347
202211
202132
202012
201912
201827
201713
20166
20159
201422
201338
201221
201119
20104
200928
200820

Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.

When in the year does Connecticut get them?

Connecticut's flash flood warnings by month, 2008-2025
50100150Jan: 2JanFeb: 0FebMar: 0MarApr: 1AprMay: 22MayJun: 34JunJul: 122JulAug: 84AugSep: 64SepOct: 14OctNov: 1NovDec: 5Dec12250100150Jan: 2JanFeb: 0FebMar: 0MarApr: 1AprMay: 22MayJun: 34JunJul: 122JulAug: 84AugSep: 64SepOct: 14OctNov: 1NovDec: 5Dec12250100150Jan: 2JanFeb: 0FebMar: 0MarApr: 1AprMay: 22MayJun: 34JunJul: 122JulAug: 84AugSep: 64SepOct: 14OctNov: 1NovDec: 5Dec12250100150Jan: 2JFeb: 0FMar: 0MApr: 1AMay: 22MJun: 34JJul: 122JAug: 84ASep: 64SOct: 14ONov: 1NDec: 5D122

Sum of 2008-2025; the busiest month is labelled.

Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.

Where in Connecticut?

County or forecast zoneSince 2008Since 2023Last issued
Fairfield11040September 13, 2026
New Haven8624September 13, 2026
Hartford7725August 8, 2026
Tolland6919August 3, 2026
New London6213September 13, 2026
Windham5814July 10, 2025
Litchfield529August 8, 2026
Middlesex449September 13, 2026

The NWS issues these products for counties or forecast zones; a zone can be part of a county or a mountain range.

Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.

The latest flash flood warnings for Connecticut in AreaZine's record

This list is AreaZine's record of the NWS alert feed, kept since April 6, 2026; the counts above come from the complete IEM archive.

Source: National Weather Service alerts (api.weather.gov).

What is a flash flood warning?

A flash flood warning means flash flooding is happening or about to happen: water rising fast in streams, streets or dry washes, usually within six hours of heavy rain or a dam or levee failure. A warning means the hazard is happening, about to happen, or very likely: act now to protect people and property. The national record · Every warning type in Connecticut.