UTC Offset
UTC-04:00
Merrimack, United States Snapshot 2026
Where is Merrimack?
Merrimack, United States
- Continent
- Americas
- Country
- United States
- City
- Merrimack
- Population
- 26.7K
- Elevation
- 47 m
- Coordinates
- 42.87°, -71.49°
Merrimack is a city in United States with a population of approximately 26.7K. Average temperatures range from -6°C (21°F) in January to 29°C (84°F) in July. The best time to visit is June, July, August, September, October.
Time in Merrimack right now
Open full time & time zone page 14:04 04
Monday, June 15, 2026
IANA time zone
America/New_York
Daylight saving
DST in effect
EST / EDT
Next DST change
November 1
backward -1h
Live weather in Merrimack
Daylight in Merrimack today
View full sunrise & sunset page Sunrise
Sunset
Day length
15h 19m
Climate normals for Merrimack
Long-term monthly averages based on historical data.
January
Poor 
February
Poor March
Poor April
Fair May
Good June best
Excellent July best
Excellent August best
Excellent September best
Excellent October best
Good November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 2°C / -6°C | -3°C / -11°C | 9days (87 mm) Wet | 6h Fair | 68% Muggy | 2.2 Moderate | Poor | View Details |
| February | 4°C / -6°C | -1°C / -11°C | 9days (78 mm) Wet | 6.8h Fair | 69% Muggy | 3.2 Moderate | Poor | View Details |
| March | 8°C / -2°C | 4°C / -6°C | 11days (94 mm) Wet | 7.8h Good | 66% Muggy | 4 Moderate | Poor | View Details |
| April | 13°C / 4°C | 11°C / 0°C | 12days (104 mm) Wet | 8.4h Good | 67% Muggy | 5.1 High | Fair | View Details |
| May | 20°C / 10°C | 19°C / 8°C | 11days (91 mm) Wet | 9.6h Good | 71% Muggy | 6.1 High | Good | View Details |
| June best | 25°C / 15°C | 26°C / 15°C | 11days (79 mm) Wet | 10.8h Excellent | 69% Muggy | 6.5 High | Excellent | View Details |
| July best | 29°C / 19°C | 31°C / 20°C | 12days (106 mm) Wet | 11.1h Excellent | 70% Muggy | 6.8 High | Excellent | View Details |
| August best | 27°C / 18°C | 29°C / 19°C | 11days (86 mm) Wet | 10.7h Excellent | 71% Muggy | 6.4 High | Excellent | View Details |
| September best | 23°C / 14°C | 23°C / 14°C | 8days (82 mm) Wet | 8.7h Good | 73% Muggy | 5.1 High | Excellent | View Details |
| October best | 17°C / 9°C | 15°C / 6°C | 10days (104 mm) Wet | 6.9h Fair | 75% Muggy | 3.7 Moderate | Good | View Details |
| November | 9°C / 2°C | 6°C / -2°C | 9days (79 mm) Wet | 6.4h Fair | 71% Muggy | 2.6 Moderate | Poor | View Details |
| December | 3°C / -4°C | -1°C / -8°C | 10days (120 mm) Wet | 5.5h Fair | 72% Muggy | 1.8 Low | Poor | View Details |
Monthly Temperatures
HighLow
Line chart showing monthly temperatures. Jan: 2°C / -6°C . Feb: 4°C / -6°C . Mar: 8°C / -2°C . Apr: 13°C / 4°C . May: 20°C / 10°C . Jun: 25°C / 15°C . Jul: 29°C / 19°C . Aug: 27°C / 18°C . Sep: 23°C / 14°C . Oct: 17°C / 9°C . Nov: 9°C / 2°C . Dec: 3°C / -4°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 87 mm. Feb: 78 mm. Mar: 94 mm. Apr: 104 mm. May: 91 mm. Jun: 79 mm. Jul: 106 mm. Aug: 86 mm. Sep: 82 mm. Oct: 104 mm. Nov: 79 mm. Dec: 120 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 68%. Feb: 69%. Mar: 66%. Apr: 67%. May: 71%. Jun: 69%. Jul: 70%. Aug: 71%. Sep: 73%. Oct: 75%. Nov: 71%. Dec: 72%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 18 km/h . Feb: 19 km/h . Mar: 19 km/h . Apr: 18 km/h . May: 16 km/h . Jun: 15 km/h . Jul: 14 km/h . Aug: 14 km/h . Sep: 14 km/h . Oct: 16 km/h . Nov: 18 km/h . Dec: 18 km/h .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 3. Mar: UV 4. Apr: UV 5. May: UV 6. Jun: UV 7. Jul: UV 7. Aug: UV 6. Sep: UV 5. Oct: UV 4. Nov: UV 3. Dec: UV 2.
Frequently Asked Questions
Merrimack has a population of approximately 26.7K.
The best months to visit Merrimack are June, July, August, September, October, when temperatures are pleasant and rainfall is lower.
Merrimack receives approximately 1110mm of rainfall annually across 123 rainy days.
Merrimack is located in United States, in the Americas region.
Merrimack sits at an elevation of 47 m (154 ft) above sea level.