Waterbury, CT weather in September
In September, Waterbury sees highs around 75°F and lows around 53°F: mild, with some rain. Expect about 9 wet days. Good for outdoor plans.
- Normal high
- 75°F
- Normal low
- 53°F
- Wet days
- 9
- 5.0 in total
- Muggy days
- 4
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 80°F | 70°F |
| Normal low | 57°F | 47°F |
| Chance of a wet day | 28% | 32% |
| Sunrise / sunset | 6:18 am / 7:26 pm | 6:48 am / 6:36 pm |
| Daylight | 13.1 h | 11.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical September day
- 6 am57°Fdew point 54°F
- 9 am65°Fdew point 55°F
- Noon72°Fdew point 55°F
- 3 pm74°Fdew point 54°F
- 6 pm69°Fdew point 56°F
- 9 pm63°Fdew point 56°F
NOAA hourly normals (local standard time) from Hartford Bradley Intl Airport (32 mi away); average wind 7 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F16 of 30
- Hot dayshigh 90°F or more1 of 30
- Muggy daysdaily mean dew point 65°F or more4 of 30
- Wet daysat least 0.01 in of rain or melted snow9 of 30
- Notable rainat least 0.10 in6 of 30
- Freezing nightslow 32°F or below0 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 5.0 in; a dry September brings about 2.7 in and a wet one about 6.6 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 1 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202015: average high 81°F
- Coolest September2001: average high 70°F
- Wettest September1999: 14.9 in
- Driest September2016: 1.1 in
- Highest reading97°F (September 9, 2015)
- Lowest reading24°F (September 22, 1991)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 82°F | 75°F | 63°F |
| Normal low | 60°F | 53°F | 41°F |
| Wet days | 10 | 9 | 10 |
| Comfortable days | 7 | 16 | 12 |
| Daylight | 13.8 h | 12.5 h | 11.1 h |
Highs change by -7°F from August and -12°F into October.
Nearby alternatives in September
- Cooler: Kennebunkport, ME181 mi · high 69°F · 10 wet days
How Waterbury ranks in September
- Normal high274th warmest of 378 cities; 3rd of 5 in Connecticut
- Wet days240th driest of 378
- Comfortable days61st most of 342
What to pack for Waterbury in September
- A rain jacket or umbrella – rain on about 9 days
Heating and cooling
September has 105 heating degree days and 72 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Waterbury in September?
The normal high is 75°F and the normal low is 53°F. From 1991 to 2020 the hottest September reading was 97°F (September 9, 2015).
Does it rain a lot in Waterbury in September?
About 9 days in September have at least 0.01 in of precipitation, and the normal total is 5.0 in. The wettest September in 1991-2020 was in 1999 (14.9 in); the driest was in 2016 (1.1 in).
Is September a good time to visit Waterbury?
September ranks 2nd of 12 months on our comfort score for Waterbury (69 out of 100). It has about 16 comfortable days and about 1 day at 90°F or hotter. The best months are May and September.
Where the numbers come from
- Temperature and rain: Burlington (USC00060973), 17 mi NNE of the city center, 505 ft (234 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Bakersville (USC00060227), 20 mi N of the city center, 686 ft (415 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Frost dates: Meriden Markham Muni Airport (USW00054788), 12 mi ESE of the city center, 103 ft (168 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Hartford Bradley Intl Airport (USW00014740), 32 mi NE of the city center, 190 ft (81 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Bradley International Airport (725080-14740), 32 mi NE of the city center, 169 ft (102 ft lower than the city). Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).