Merrimack County, NH Weather Forecast
County weather hub
Areas Of Fog then Light Rain
Compare major city weather across Merrimack County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Areas of fog and a chance of rain before 7am, then rain and areas of fog. Cloudy, with a high near 57. East wind around 5 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch possible.
County Weather Overview
This county weather page brings together forecast coverage for Merrimack County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 10 of 10 mapped cities in Merrimack County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Oct 13 to Oct 18, 2026
- Latest sync
- Oct 12, 2026 8:47 AM EDT
- Forecast office
- GYX
- Source
- NOAA / NWS
Daily Outlook
This Week in Merrimack County
Wednesday looks like the warmest upcoming period in Merrimack County at 68 degrees F.
Saturday Night is the coolest period ahead with temperatures near 29 degrees F.
The strongest winds are forecast for Saturday at about 15 to 20 mph NW.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 12, 2026 8:47 AM EDT
- Coverage
- 6 days
- Time zone
- America/New_York
- Forecast office
- GYX
- Radar station
- KGYX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Rain before 8pm, then rain and a slight chance of thunderstorms between 8pm and 5am. Cloudy, with a low around 51. South wind around 5 mph. Chance of precipitation is 90%.
Partly sunny, with a high near 68. West wind 5 to 10 mph.
Mostly cloudy, with a low around 46.
Mostly sunny, with a high near 61.
A chance of rain showers after 2am. Mostly cloudy, with a low around 38. Chance of precipitation is 40%.
Rain showers. Mostly cloudy, with a high near 59. Chance of precipitation is 90%.
Rain showers before 4am. Mostly cloudy, with a low around 37. Chance of precipitation is 80%.
Partly sunny, with a high near 48.
Partly cloudy, with a low around 29.
Sunny, with a high near 52.
Mostly clear, with a low around 32.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Oct 13
|
Areas Of Fog then Light Rain
|
57°F |
5 mph
E
|
|
Tuesday Night
Oct 13
|
Light Rain
|
51°F |
5 mph
S
|
|
Wednesday
Oct 14
|
Partly Sunny
|
68°F |
5 to 10 mph
W
|
|
Wednesday Night
Oct 14
|
Mostly Cloudy
|
46°F |
5 mph
NW
|
|
Thursday
Oct 15
|
Mostly Sunny
|
61°F |
5 to 10 mph
NW
|
|
Thursday Night
Oct 15
|
Mostly Cloudy then Chance Rain Showers
|
38°F |
0 to 5 mph
N
|
|
Friday
Oct 16
|
Rain Showers
|
59°F |
0 to 5 mph
S
|
|
Friday Night
Oct 16
|
Rain Showers
|
37°F |
5 to 15 mph
NW
|
|
Saturday
Oct 17
|
Partly Sunny
|
48°F |
15 to 20 mph
NW
|
|
Saturday Night
Oct 17
|
Partly Cloudy
|
29°F |
5 to 15 mph
NW
|
|
Sunday
Oct 18
|
Sunny
|
52°F |
5 to 10 mph
W
|
|
Sunday Night
Oct 18
|
Mostly Clear
|
32°F |
0 to 5 mph
SW
|
Major City Forecasts
Live forecast snapshots for major cities across Merrimack County.
Coverage
Forecast coverage currently spans 10 of 10 mapped cities in Merrimack County.
Largest mapped city population in this region: 43,924.
