Nashua, New Hampshire Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Nashua weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——92°54°—
- FridayJun 5Overcast——88°60°-4°
- SaturdayJun 6Showers31%0.31″88°63°0°
- SundayJun 7Light Showers76%0.14″81°55°-7°
- MondayJun 8Light Drizzle36%—76°51°-5°
- TuesdayJun 9Overcast——80°52°+4°
- WednesdayJun 10Overcast——86°58°+6°
Ozone at AQI 500 — peak already passed at 1 PM under clear skies. AQI up 17 in the last 6 hours — air quality is degrading. Levels should ease through evening.
AVOID OUTDOORS Avoid outdoor exertion. Keep windows closed; use HEPA filtration indoors if available.
What's driving it
Ozone × UV × Sky
Ozone at AQI 500 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 500
- UV peak
- 5.2 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 500
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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 3:23 AM
- Moonset
- 12:35 PM
- In sign
- ♒︎ Aquarius
Fireflies rise from the lawn
Nashua at a glance
- Today vs. normal: 17°F above the seasonal normal for this latitude
- Last frost: May 2 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Nashua
SPC has placed Nashua in the Marginal Risk category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- DAY 3MRGLMarginal Risk
Isolated severe storms possible. Limited threat for hail or damaging wind.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | — | — |
| May | lettuce, peas, spinach, radishes | lettuce, peas, radishes |
| June | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | tomatoes, peppers, beans, squash, fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | — | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
July brings Nashua's warmest temperatures (~73°F mean) while January delivers the coldest (~24°F). October sees peak rainfall at 4.7 inches, with January recording the lowest at 3.0 inches.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 24° | 3.0″ | 10 |
| February | 27° | 3.1″ | 10 |
| March | 35° | 4.1″ | 14 |
| April | 47° | 3.9″ | 13 |
| May | 58° | 3.6″ | 12 |
| June | 67° | 4.2″ | 14 |
| July | 73° | 3.6″ | 12 |
| August | 71° | 3.7″ | 12 |
| September | 64° | 4.2″ | 14 |
| October | 51° | 4.7″ | 16 |
| November | 40° | 3.7″ | 12 |
| December | 30° | 4.5″ | 15 |
Regional context
Nashua falls within a warm-summer humid continental climate region — sharing similar temperature ranges, seasonal patterns, and growing conditions with nearby cities in this climate zone.
Similar climates: Manchester, NH, Portsmouth, NH, Dover, NH, Concord, NH, Rochester, NH.
Naturalist notes
Late May brings the first ruby-throated hummingbirds to Nashua's gardens and feeders.
Apple trees reach full bloom across the area during the final weeks of May.
Frequently asked
- When does it freeze in Nashua?
- Nashua's last spring frost typically occurs around mid-May, with the first fall frost returning around mid-October.
- What is the rainy season in Nashua?
- October receives the most rainfall with about 4.7 inches on average; the city gets roughly 46 inches annually.
- What is the warmest month in Nashua?
- July typically brings the warmest weather, averaging about 73°F.
- What is the coldest month in Nashua?
- January typically delivers the coldest temperatures, averaging about 24°F.
- When can I start a vegetable garden in Nashua?
- Cool-season crops (peas, lettuce) can be planted around the last spring frost (mid-May); warm-season crops (tomatoes, peppers) should wait until 1–2 weeks after.
- How many rainy days does Nashua get?
- Nashua averages about 154 rainy days per year.
- What hardiness zone is Nashua?
- Nashua's USDA hardiness zone depends on its lowest average winter temperature; check the USDA's online lookup with the city ZIP for the current zone designation.
Climate
Nashua, New Hampshire experiences a warm-summer humid continental climate zone. January temperatures hover near 24°F while July averages 73°F — a 49°F seasonal swing.
Throughout the year, Nashua receives about 46 inches of precipitation spread over roughly 154 rainy days.
Latitude (42.7°N), proximity to large water bodies, and elevation determine the rhythm of the year — shaping what grows here, when frost arrives, and the daily weather patterns.