Hartford, CT weather in September
Hartford is mild in September, with frequent rain: highs average 76°F and nights drop to about 56°F. There are about 10 days with rain. A good month for most outdoor plans.
- Normal high
- 76°F
- Normal low
- 56°F
- Wet days
- 10
- 4.0 in total
- Muggy days
- 4
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 81°F | 70°F |
| Normal low | 61°F | 50°F |
| Chance of a wet day | 32% | 36% |
| Sunrise / sunset | 6:16 am / 7:24 pm | 6:46 am / 6:34 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 (12 mi away); average wind 7 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F15 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 snow10 of 30
- Notable rainat least 0.10 in5 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 4.0 in; a dry September brings about 1.9 in and a wet one about 5.3 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 82°F
- Coolest September1992: average high 72°F
- Wettest September2008: 11.8 in
- Driest September1997: 0.6 in
- Highest reading96°F (September 6, 2018)
- Lowest reading31°F (September 25, 1996)
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 | 83°F | 76°F | 64°F |
| Normal low | 64°F | 56°F | 44°F |
| Wet days | 10 | 10 | 11 |
| Comfortable days | 6 | 15 | 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: Rutland, VT128 mi · high 71°F · 10 wet days
How Hartford ranks in September
- Normal high267th warmest of 378 cities; 1st of 5 in Connecticut
- Wet days314th driest of 378
- Comfortable days76th most of 342
What to pack for Hartford in September
- A rain jacket or umbrella – rain on about 10 days
Heating and cooling
September has 76 heating degree days and 100 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Hartford in September?
The normal high is 76°F and the normal low is 56°F. From 1991 to 2020 the hottest September reading was 96°F (most recently on September 6, 2018).
Does it rain a lot in Hartford in September?
About 10 days in September have at least 0.01 in of precipitation, and the normal total is 4.0 in. The wettest September in 1991-2020 was in 2008 (11.8 in); the driest was in 1997 (0.6 in).
Is September a good time to visit Hartford?
September ranks 2nd of 12 months on our comfort score for Hartford (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 and frost dates: Hartford Brainard Fld (USW00014752), 2.6 mi SE of the city center, 19 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and humidity and wind by hour: Hartford Bradley Intl Airport (USW00014740), 12 mi N of the city center, 190 ft (140 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Snow depth: Burlington (USC00060973), 13 mi W of the city center, 505 ft (455 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Bradley International Airport (725080-14740), 12 mi N of the city center, 169 ft (119 ft higher than the city). Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).