Nashua, New Hampshire Weather
Apples hang heavy on the branch. Day 93 of summer. Read this microseason across nine climate regions →
Nashua weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 10:26 AM EDT · Open-Meteo
- TodaySep 21Overcast later18%0.02″68°52°—
- TuesdaySep 22Overcast——63°48°-5°
- WednesdaySep 23Overcast——62°44°-1°
- ThursdaySep 24Overcast——64°41°+2°
- FridaySep 25Overcast51%—70°45°+6°
- SaturdaySep 26Overcast53%—74°50°+4°
- SundaySep 27Overcast50%—75°54°+1°
Air quality now AQI 36 · Good
AQI 36 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 34. Overcast through the UV peak window (cloud cover ~73%) — afternoon ozone should stay flat.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 34. Overcast through the UV peak window (cloud cover ~73%) — afternoon ozone should stay flat.
- Present
- AQI 34
- UV peak
- 4.2 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 10
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
September dries up ditches or breaks down bridges.
- Moonrise
- 4:26 PM
- Moonset
- 12:54 AM
- In sign
- ♑︎ Capricorn
Apples hang heavy on the branch
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Nashua at a glance
- Today vs. normal: Today averages 60°F (high 68°F, low 52°F), about the 61°F normal for Sep 21
- Last frost: April 29 (1991–2020 median, NOAA station 2 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots
16-Day Forecast — Nashua
- Mon68°52°18%
- Tue63°48°0%
- Wed62°44°1%
- Thu64°41°8%
- Fri70°45°51%
- Sat74°50°53%
- Sun75°54°50%
- Mon71°50°25%
- Tue72°49°15%
- Wed73°51°22%
- Thu66°56°22%
- Fri70°51°19%
- Sat64°46°13%
- Sun73°48°16%
- Mon71°57°25%
- Tue58°42°18%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Nashua
Interactive wind and temperature map centered on Nashua — it loads in your browser. Open the full weather map.
Right now in the garden
Fall planting + final harvests
As of September 21, the season's first frost (typically October 8) is approaching. Pick what frost-tender plants still carry before the next cold front. This city's planting calendar for September: plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, and carrots.
Sun & seasons in Nashua
Nashua sits in Hillsborough County, where the year’s longest day runs 15h 20m of daylight and its shortest just 9h 2m — a swing of +6h 18m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Nashua is the state’s largest city. The nearest town Nashua tracks is Manchester, roughly 16 miles to the N.
Air quality in Nashua
Air quality in Nashua’s county has held roughly steady since 2020; its cleanest year on record was 2020 (median AQI 37). See the full air-quality history for Nashua.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| April | lettuce, peas, spinach, radishes | — |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, spinach, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| July | beans, squash, fall brassicas, carrots | lettuce, peas, spinach, beans, summer squash, garlic |
| August | — | tomatoes, peppers, beans, summer squash, garlic |
| September | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| October | — | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
A year in weather
July is Nashua's warmest stretch (~73°F) and January its coldest (~24°F); precipitation crests in October at 4.7 inches and ebbs in January to 3.0 inches.
| Month | Mean temp | Precip |
|---|---|---|
| January | 24° | 3.0″ |
| February | 27° | 3.1″ |
| March | 35° | 4.1″ |
| April | 47° | 3.9″ |
| May | 58° | 3.6″ |
| June | 67° | 4.2″ |
| July | 73° | 3.6″ |
| August | 71° | 3.7″ |
| September | 64° | 4.2″ |
| October | 51° | 4.7″ |
| November | 40° | 3.7″ |
| December | 30° | 4.5″ |
Regional context
Similar climates East Merrimack, NH, Manchester, NH, Klondike Corner, NH
Nashua swings from 24°F in January to 73°F in July (49°F) per NOAA NCEI 1991-2020 normals; precipitation in Nashua runs about 46.3 inches.
Nashua's precipitation spreads evenly across the seasons: October peaks at 4.7 inches, while January holds 3.0 inches — no season dominates Nashua's rain calendar. It is a balanced pattern Nashua shares with places like East Merrimack, NH, Manchester, NH and Klondike Corner, NH.
Nashua reaches its last hard frost near April 29; that is the cue for kale, peas, spinach, and parsnips. Tomatoes and peppers do best set out two weeks later in Nashua, once nights clear the mid-40s°F. By October 8, frost is back in Nashua — protect or harvest anything tender. Open lawns in Nashua whiten first when frost returns.
Similar climates: East Merrimack, NH, Manchester, NH, Klondike Corner, NH, Pinardville, NH, New Boston, NH.
Frequently asked
- When does it freeze in Nashua?
- In Nashua, expect the last spring frost near April 29; Nashua's first autumn frost comes around October 8.
- What is the rainy season in Nashua?
- Rainfall in Nashua peaks in October near 4.7 inches, out of about 46 inches annually.
- What is the warmest month in Nashua?
- The warmest stretch in Nashua comes in July, around 73°F on average.
- What is the coldest month in Nashua?
- On average January is the chilliest month in Nashua, about 24°F.
- When can I start a vegetable garden in Nashua?
- Nashua's last frost (April 29) cues hardy greens; in Nashua, hold heat-lovers two weeks past.
- What hardiness zone is Nashua?
- Nashua sits in the USDA zone set by January lows near 24°F; the USDA ZIP tool gives the band.
- What is the 10-day forecast for Nashua?
- Nashua's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in Nashua?
- See this week's day-by-day rain chances for Nashua in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Nashua?
- Current conditions for Nashua and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Nashua forecast updated?
- The Nashua forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Nashua?
- Today's sunrise and sunset times for Nashua are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for Nashua?
- The next few days in Nashua's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Nashua sits at 42.7°N; its climate zone is warm-summer humid continental (Köppen approximation).
ZIP codes in Nashua
- 03060
- 03061
- 03062
- 03063
- 03064