Stamford, CT weather in September
Stamford is mild in September, with some rain: highs average 74°F and nights drop to about 57°F. Rain falls on about 10 days. A good month for most outdoor plans.
- Normal high
- 74°F
- Normal low
- 57°F
- Wet days
- 10
- 4.9 in total
- Muggy days
- 5
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 79°F | 69°F |
| Normal low | 61°F | 51°F |
| Chance of a wet day | 32% | 34% |
| Sunrise / sunset | 6:20 am / 7:27 pm | 6:49 am / 6:38 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 am59°Fdew point 55°F
- 9 am67°Fdew point 57°F
- Noon72°Fdew point 56°F
- 3 pm73°Fdew point 56°F
- 6 pm67°Fdew point 57°F
- 9 pm63°Fdew point 57°F
NOAA hourly normals (local standard time) from Westchester Co Airport (9 mi away); average wind 6 mph; clear or few clouds in 58% of daytime hours, mostly cloudy or overcast in 34%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F15 of 30
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph6 of 30
- Hot dayshigh 90°F or more1 of 30
- Muggy daysdaily mean dew point 65°F or more5 of 30
- Wet daysat least 0.01 in of rain or melted snow10 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 4.9 in; a dry September brings about 2.2 in and a wet one about 6.6 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 2 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202015: average high 80°F
- Coolest September1991: average high 71°F
- Wettest September2004: 12.6 in
- Driest September2009: 0.6 in
- Highest reading95°F (September 8, 2015)
- Lowest reading32°F (September 20, 2004)
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 | 81°F | 74°F | 63°F |
| Normal low | 64°F | 57°F | 46°F |
| Wet days | 11 | 10 | 10 |
| Comfortable days | 7 | 15 | 11 |
| Daylight | 13.8 h | 12.5 h | 11.1 h |
Highs change by -7°F from August and -11°F into October.
Nearby alternatives in September
- Warmer: Dover, DE168 mi · high 79°F · 8 wet days
- Cooler: Lake Placid, NY224 mi · high 66°F · 12 wet days
How Stamford ranks in September
- Normal high296th warmest of 378 cities; 4th of 5 in Connecticut
- Wet days298th driest of 378
- Comfortable days71st most of 342
What to pack for Stamford in September
- A rain jacket or umbrella – rain on about 10 days
Heating and cooling
September has 74 heating degree days and 88 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Stamford in September?
The normal high is 74°F and the normal low is 57°F. From 1991 to 2020 the hottest September reading was 95°F (September 8, 2015).
Does it rain a lot in Stamford in September?
About 10 days in September have at least 0.01 in of precipitation, and the normal total is 4.9 in. The wettest September in 1991-2020 was in 2004 (12.6 in); the driest was in 2009 (0.6 in).
Is September a good time to visit Stamford?
September ranks 3rd of 12 months on our comfort score for Stamford (69 out of 100). It has about 15 comfortable days and about 1 day at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature, rain, frost dates and humidity and wind by hour: Westchester Co Airport (USW00094745), 8.8 mi W of the city center, 379 ft (363 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Bridgeport Sikorsky Mem Airport (USW00094702), 23 mi ENE of the city center, 5 ft . NOAA normals and daily records, 1991-2020.
- Cloud cover: Teterboro Airport (USW00094741), 31 mi WSW of the city center, 9 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Westchester County Airport (725037-94745), 8.7 mi W of the city center, 370 ft (354 ft higher than the city). Hourly observations, 1991-2020.