Concord, NH weather in September
Expect mild weather with some rain in Concord in September, with highs near 74°F and lows near 49°F. Rain falls on about 9 days. Great for outdoor plans.
- Normal high
- 74°F
- Normal low
- 49°F
- Wet days
- 9
- 3.6 in total
- Muggy days
- 2
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 79°F | 68°F |
| Normal low | 54°F | 43°F |
| Chance of a wet day | 30% | 33% |
| Sunrise / sunset | 6:10 am / 7:21 pm | 6:42 am / 6:29 pm |
| Daylight | 13.2 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 am52°Fdew point 50°F
- 9 am62°Fdew point 53°F
- Noon70°Fdew point 52°F
- 3 pm72°Fdew point 52°F
- 6 pm65°Fdew point 53°F
- 9 pm58°Fdew point 53°F
NOAA hourly normals (local standard time) from Concord Muni Airport (2 mi away); average wind 5 mph; clear or few clouds in 57% of daytime hours, mostly cloudy or overcast in 36%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F17 of 30
- Hot dayshigh 90°F or more1 of 30
- Muggy daysdaily mean dew point 65°F or more2 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 below1 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 3.6 in; a dry September brings about 2.3 in and a wet one about 4.8 in (25th and 75th percentiles). About 2 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 79°F
- Coolest September1993: average high 69°F
- Wettest September1999: 9.4 in
- Driest September2014: 0.4 in
- Highest reading96°F (September 2, 2010)
- Lowest reading26°F (September 29, 2000)
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 | 74°F | 61°F |
| Normal low | 57°F | 49°F | 38°F |
| Wet days | 10 | 9 | 11 |
| Comfortable days | 9 | 17 | 9 |
| Daylight | 13.9 h | 12.5 h | 11.0 h |
Highs change by -8°F from August and -13°F into October.
Nearby alternatives in September
- Cooler: Lake Placid, NY143 mi · high 66°F · 12 wet days
How Concord ranks in September
- Normal high303rd warmest of 378 cities; 2nd of 4 in New Hampshire
- Wet days271st driest of 378
- Comfortable days38th most of 342
What to pack for Concord in September
- Layers – afternoons near 74°F but nights near 49°F
- A rain jacket or umbrella – rain on about 9 days
Heating and cooling
September has 160 heating degree days and 50 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Concord in September?
The normal high is 74°F and the normal low is 49°F. From 1991 to 2020 the hottest September reading was 96°F (September 2, 2010).
Does it rain a lot in Concord in September?
About 9 days in September have at least 0.01 in of precipitation, and the normal total is 3.6 in. The wettest September in 1991-2020 was in 1999 (9.4 in); the driest was in 2014 (0.4 in).
Is September a good time to visit Concord?
September ranks 2nd of 12 months on our comfort score for Concord (70 out of 100). It has about 17 comfortable days and about 1 day at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature, rain, snowfall, snow depth, frost dates, humidity and wind by hour and cloud cover: Concord Muni Airport (USW00014745), 2.0 mi ESE of the city center, 346 ft (72 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Concord Municipal Airport (726050-14745), 1.8 mi E of the city center, 339 ft (65 ft higher than the city). Hourly observations, 1991-2020.