Merrimack, NH Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Merrimack, NH in one place.
Mostly sunny, with a high near 81. South wind 0 to 5 mph.
Local Weather Overview
This forecast page for Merrimack, NH is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Jun 16, 2026 12:48 PM EDT.
The active forecast window currently covers Jun 17 to Jun 22, 2026 for Merrimack, NH.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jun 17 to Jun 22, 2026
- Latest sync
- Jun 16, 2026 12:48 PM EDT
- Forecast office
- GYX
- Source
- NOAA / NWS
Daily Outlook
This Week in Merrimack
Wednesday looks like the warmest upcoming period in Merrimack at 81 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 55 degrees F.
The strongest winds are forecast for Juneteenth at about 10 to 15 mph W.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Jun 16, 2026 12:48 PM EDT
- Coverage
- 6 days
- Time zone
- America/New_York
- Forecast office
- GYX
- Radar station
- KBOX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Partly cloudy, with a low around 55. South wind 0 to 5 mph.
Rain showers likely before 2pm, then showers and thunderstorms. Mostly cloudy, with a high near 79. South wind 0 to 10 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.
Showers and thunderstorms before 2am. Partly cloudy, with a low around 60. Chance of precipitation is 80%.
Sunny, with a high near 81.
Mostly clear, with a low around 58.
Sunny, with a high near 78.
Mostly clear, with a low around 57.
A slight chance of rain showers after 3pm. Mostly sunny, with a high near 79.
A slight chance of rain showers before 7pm. Partly cloudy, with a low around 57.
A chance of rain showers after 10am. Mostly sunny, with a high near 80. Chance of precipitation is 40%.
A chance of rain showers. Mostly cloudy, with a low around 57.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Jun 17
|
Mostly Sunny
|
81°F |
0 to 5 mph
S
|
|
Wednesday Night
Jun 17
|
Partly Cloudy
|
55°F |
0 to 5 mph
S
|
|
Thursday
Jun 18
|
Showers And Thunderstorms
|
79°F |
0 to 10 mph
S
|
|
Thursday Night
Jun 18
|
Showers And Thunderstorms
|
60°F |
5 to 10 mph
SW
|
|
Juneteenth
Jun 19
|
Sunny
|
81°F |
10 to 15 mph
W
|
|
Friday Night
Jun 19
|
Mostly Clear
|
58°F |
10 to 15 mph
W
|
|
Saturday
Jun 20
|
Sunny
|
78°F |
10 to 15 mph
W
|
|
Saturday Night
Jun 20
|
Mostly Clear
|
57°F |
5 to 15 mph
W
|
|
Sunday
Jun 21
|
Mostly Sunny then Slight Chance Rain Showers
|
79°F |
5 to 10 mph
NW
|
|
Sunday Night
Jun 21
|
Slight Chance Rain Showers then Partly Cloudy
|
57°F |
0 to 5 mph
W
|
|
Monday
Jun 22
|
Chance Rain Showers
|
80°F |
0 to 5 mph
SW
|
|
Monday Night
Jun 22
|
Chance Rain Showers
|
57°F |
0 to 5 mph
N
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Merrimack.
