Nashua, NH weather in September
Expect mild weather with some rain in Nashua in September, with highs near 74°F and lows near 51°F. Rain falls on about 10 days. Great for outdoor plans.
- Normal high
- 74°F
- Normal low
- 51°F
- Wet days
- 10
- 3.7 in total
- Muggy days
- 3
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 79°F | 68°F |
| Normal low | 56°F | 45°F |
| Chance of a wet day | 30% | 34% |
| 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 am57°Fdew point 52°F
- 9 am65°Fdew point 53°F
- Noon71°Fdew point 52°F
- 3 pm73°Fdew point 52°F
- 6 pm68°Fdew point 54°F
- 9 pm63°Fdew point 54°F
NOAA hourly normals (local standard time) from Manchester Airport (12 mi away); average wind 6 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°F16 of 30
- Hot dayshigh 90°F or more1 of 30
- Muggy daysdaily mean dew point 65°F or more3 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 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 3.7 in; a dry September brings about 2.3 in and a wet one about 5.2 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 80°F
- Coolest September1994: average high 70°F
- Wettest September2008: 9.0 in
- Driest September2019: 0.9 in
- Highest reading95°F (September 12, 2013)
- 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 | 59°F | 51°F | 38°F |
| Wet days | 11 | 10 | 11 |
| Comfortable days | 8 | 16 | 10 |
| 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, NY164 mi · high 66°F · 12 wet days
How Nashua ranks in September
- Normal high297th warmest of 378 cities; 1st of 4 in New Hampshire
- Wet days287th driest of 378
- Comfortable days46th most of 342
What to pack for Nashua in September
- A rain jacket or umbrella – rain on about 10 days
Heating and cooling
September has 138 heating degree days and 63 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Nashua in September?
The normal high is 74°F and the normal low is 51°F. From 1991 to 2020 the hottest September reading was 95°F (most recently on September 12, 2013).
Does it rain a lot in Nashua in September?
About 10 days in September have at least 0.01 in of precipitation, and the normal total is 3.7 in. The wettest September in 1991-2020 was in 2008 (9.0 in); the driest was in 2019 (0.9 in).
Is September a good time to visit Nashua?
September ranks 2nd of 12 months on our comfort score for Nashua (70 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, rain, snowfall and snow depth: Hudson 1 Sse (USC00274234), 3.0 mi ENE of the city center, 185 ft . NOAA normals and daily records, 1991-2020.
- Frost dates: Nashua 2 Nnw (USC00275712), 1.8 mi N of the city center, 135 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Manchester Airport (USW00014710), 12 mi N of the city center, 225 ft (66 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Cloud cover: Concord Muni Airport (USW00014745), 30 mi N of the city center, 346 ft (187 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Manchester Airport (743945-14710), 12 mi N of the city center, 229 ft (70 ft higher than the city). Hourly observations, 1991-2020.