Live Weather & Forecast
Weather in Merrimack
New Hampshire, United States · Real-time conditions & 3-day outlook
9°C
Feels like 8°C
48°F / Feels 46°F
Overcast
Merrimack, New Hampshire
🌙 Nighttime
Updated: 2026-04-12 20:00
Humidity
37%
Wind
7.2 km/h SSE
Wind Gust
11.7 km/h
Pressure
1027 mb
Visibility
16 km
UV Index
0
(Low)
Precipitation
0 mm
Cloud Cover
100%
Dew Point
-5.3°C
Wind Degree
149°
Air Quality Index
US EPA: Good
UK DEFRA: Low (1)
CO
209.9 μg/m³
NO₂
6.4 μg/m³
O₃
96 μg/m³
SO₂
2.7 μg/m³
PM 2.5
8.1 μg/m³
PM 10
8.6 μg/m³
Today's Hourly Forecast
24-hour breakdown for Merrimack, New Hampshire
12 AM
5°
Clear
1 AM
4°
Clear
2 AM
3°
Clear
3 AM
2°
Clear
4 AM
2°
Clear
5 AM
1°
Clear
6 AM
1°
Clear
7 AM
3°
Sunny
8 AM
5°
Sunny
9 AM
6°
Sunny
10 AM
9°
Sunny
11 AM
12°
Sunny
12 PM
13°
Sunny
1 PM
15°
Sunny
2 PM
16°
Sunny
3 PM
16°
Sunny
4 PM
17°
Sunny
5 PM
17°
Sunny
6 PM
16°
Sunny
7 PM
13°
Sunny
8 PM
9°
Overcast
9 PM
11°
Clear
10 PM
10°
Clear
11 PM
9°
Patchy rain nearby
3-Day Forecast
Daily overview for Merrimack, New Hampshire
Today
Sunny
17°
/
1°
🌧️ 0% chance of rain
💧 Avg. humidity: 40%
💨 Max wind: 14 km/h
🌧️ Total precip: 0.01 mm
☀️ UV Index: 1.4
🌅 Sunrise: 06:09 AM
🌇 Sunset: 07:25 PM
🌙 Waning Crescent
🌑 Moon: 33% lit
Mon, Apr 13
Patchy rain nearby
19°
/
6°
🌧️ 85% chance of rain
💧 Avg. humidity: 79%
💨 Max wind: 27.4 km/h
🌧️ Total precip: 0.72 mm
☀️ UV Index: 0.7
🌅 Sunrise: 06:07 AM
🌇 Sunset: 07:26 PM
🌙 Waning Crescent
🌑 Moon: 23% lit
Tue, Apr 14
Partly Cloudy
25°
/
15°
🌧️ 0% chance of rain
💧 Avg. humidity: 70%
💨 Max wind: 16.9 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.7
🌅 Sunrise: 06:05 AM
🌇 Sunset: 07:27 PM
🌙 Waning Crescent
🌑 Moon: 15% lit
Best Time to Visit Merrimack
Plan your trip to Merrimack, United States around the most favorable weather conditions.
Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
Frequently Asked Questions
What is the current weather in Merrimack?
Current conditions in Merrimack: Overcast, temperature 9°C, humidity 37%.
What is the best time to visit Merrimack?
The best time to visit Merrimack is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Merrimack?
Merrimack is located at approximately 42.9° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Merrimack?
The wettest period in Merrimack is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Merrimack?
For visits to Merrimack during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Merrimack in?
Merrimack is located in United States, in the state of New Hampshire.
What are the public holidays in Merrimack in 2026?
View the 2026 public holidays for Merrimack on our Holidays page.
What are the GPS coordinates used for the weather forecast in Merrimack?
The weather forecast for Merrimack uses coordinates 42.8665, -71.4937.