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Shaded-relief atlas plate of Merrimack, New Hampshire: rivers, roads, the city limits and where the water drains.
NEW HAMPSHIRE · HILLSBOROUGH COUNTY

Merrimack

29,367 people, 230 ft above sea level in Hillsborough County.

230 ftElevation, city center
29,367People, 2024 estimate
33 sq miLand area
Sunny 66°
Sunny now Dew point 55° · NNW 7 mph · high 66°
City of Merrimack River Interstate 2 miles
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The Merrimack plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.

MILE1
TODAY

Today in Merrimack

NWS forecast and National Blend of Models · updated 4:00 PM EDT
RIGHT NOW Manchester Airport (KMHT) · 3:53 PM
Sunny
66° Sunny Feels like 66° · high of 66° near 4 PM
WindNNW 7 mphno gusts
Humidity68%rising to 100% by morning
Pressure29.92 in →steady
Visibility10 mihaze-free
CloudsClear
UV index—no forecast
Dew point 55° · Comfortableabout the same for three days
DryComfortableStickyMuggyOppressive
NEXT RAIN
Mostly cloudy
Friday30% chance · showers
LIKELY AMOUNT—amounts come within 3 days
LAST RAINSept. 270.42 in · 2 dry days
ALERTS & OUTLOOKS
No watches or warnings for Hillsborough County
NWS Gray and the Storm Prediction Center · checked 4:53 PM
SUN & MOON
↑ 6:40 AM6:31 PM ↓
11 h 51 m of daylight, 3 minutes less than yesterday
Waning gibbous, 89% lit. The Harvest Moon was full Saturday.
AIR & POLLEN
15
GOODAir quality index · ozone
Tomorrow: None, good. No pollen source yet.

The next three days, hour by hour

Sky: clear, cloudy, night Rain likely National Blend of Models
TUESDAY, SEPT. 29
WEDNESDAY, SEPT. 30
THURSDAY, OCT. 1
FRIDAY, OCT. 2
4p
7p
10p
1a
4a
7a
10a
1p
4p
7p
10p
1a
4a
7a
10a
1p
4p
7p
10p
1a
4a
7a
10a
1p
mostly cloudy day
partly cloudy night
mostly cloudy night
mostly cloudy night
mostly cloudy night
partly cloudy day
partly cloudy day
partly cloudy day
mostly cloudy day
partly cloudy night
partly cloudy night
mostly cloudy night
partly cloudy night
partly cloudy day
mostly sunny
mostly sunny
partly cloudy day
partly cloudy night
partly cloudy night
partly cloudy night
partly cloudy night
partly cloudy day
partly cloudy day
partly cloudy day
TEMPERATURE °F
66°
52°
71°
56°
77°
65°
CHANCE OF RAIN
50%
WIND, MPH
5
5
3
0
0
0
0
0
2
3
0
0
0
0
3
10
9
8
7
6
6
6
8
13
HOW IT FEELS · DEW POINT
Comfortable: dew points 52 to 60°

The next seven days, and how sure we are

Forecast, with the range 8 in 10 ensemble members agree on Normal, about 69° / 49°
TUE Sept. 29 Mostly cloudy Mostly cloudy
66° 52°
0% rain — NW 5 A
WED Sept. 30 Partly cloudy Partly cloudy
73° 55°
0% rain — S 0 B
THU Oct. 1 Partly cloudy Partly cloudy
79° 64°
0% rain — SW 5 B
FRI Oct. 2 Mostly cloudy Mostly cloudy
81° 54°
30% rain — WNW 10 C
SAT Oct. 3 Mostly sunny; cooler Mostly sunny; cooler
70° 42°
0% rain — N 6 B
SUN Oct. 4 Chance of showers Chance of showers
66° 45°
30% rain up to 0.2″ SE 6 B
MON Oct. 5 Mostly sunny Mostly sunny
65° 39°
10% rain — NW 12 C
How sure are we? AModels agree: highs within 4° BSome spread: within 8° CWide spread: check back
Range from the National Blend of Models percentiles · graded on Forecast Scores
AIR MAIL

Where today’s air came from

The air arriving over Merrimack about 5,000 feet above the ground was over the Atlantic off the Carolinas three days ago, and over the western Atlantic a day ago, about 1,190 miles back along its path. The nine paths traced from around the city fan out, so treat that as a best guess. It rose from near the ground on the way. Near the ground the air came from Canada; at 10,000 feet, from Quebec. Traced back 72 hours through NOAA’s hourly RAP analyses and the GFS beyond them, nine paths at each of three heights.

MILE7
ON THE NETWORK

Around Merrimack on the Forecast Network

Neighboring plates

Lowell MA · 18 MI 18 miles southeast Cambridge MA · 39 MI 39 miles southeast Worcester MA · 43 MI 43 miles south Boston MA · 44 MI 44 miles southeast Providence RI · 71 MI 71 miles south Springfield MA · 73 MI 73 miles southwest
FORECASTCITY
Atlas plate of Merrimack, New Hampshire. Explore the plate
NEW HAMPSHIRE · HILLSBOROUGH

Merrimack

29,367 people, 230 ft above sea level in Hillsborough County.

230 ftElevation
29,367People
33 sq miLand
Sunny 66°
SunnyDew point 55°
1

Today in Merrimack

NEXT 15 HOURS
Now mostly cloudy day 66° 0%
7p mostly cloudy night 63° 1%
10p mostly cloudy night 59° 1%
1a mostly cloudy night 56° 2%
4a mostly cloudy night 54° 1%
7a partly cloudy day 52° 1%
Mostly cloudy
NEXT RAINFriday · 30%
→
Tue0%
Mostly cloudy Mostly cloudy
52
66
A
Wed0%
Partly cloudy Partly cloudy
55
73
B
Thu0%
Partly cloudy Partly cloudy
64
79
B
Fri30%
Mostly cloudy Mostly cloudy
54
81
C
Sat0%
Mostly sunny; cooler Mostly sunny; cooler
42
70
B
Sun30%
Chance of showers Chance of showers
45
66
B
Mon10%
Mostly sunny Mostly sunny
39
65
C
Letters show how sure the forecast is: A, models agree; B, some spread; C, check back. Sample data.
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