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Weather in Merrimack, United States 🇺🇸

Current Weather in Merrimack

Partly Cloudy
25°C
Feels like 24°C. Partly Cloudy.
🌬️ 11 km/h W
💧 54% Humidity
🧭 1015 hPa
👁️ 10.0 km Visibility
☀️ UV Index: 0.0
🌡️ Dew Point: 15°C
🌅 Sunrise: 06:08 AM
🌇 Sunset: 07:24 PM
Map Overlays:

As of now, Merrimack is 25°C and partly cloudy, feeling like 24°C. Expect 54% humidity and winds of about 11 km/h, and the UV index is 0 (low). Looking ahead, Merrimack should sit between roughly 13°C and 28°C over the coming days.

Hourly Forecast for Merrimack

20:00
Partly Cloudy
22°
7%
21:00
Clear
21°
6%
22:00
Clear
20°
5%
23:00
Clear
19°
5%
00:00
Overcast
18°
17%
01:00
Overcast
17°
24%
02:00
Overcast
16°
27%
03:00
Overcast
16°
28%
04:00
Cloudy
15°
23%
05:00
Overcast
15°
30%
06:00
Partly Cloudy
15°
19%
07:00
Sunny
15°
13%
08:00
Sunny
18°
7%
09:00
Sunny
20°
4%
10:00
Sunny
22°
2%
11:00
Sunny
24°
1%
12:00
Sunny
26°
1%
13:00
Partly Cloudy
28°
2%
14:00
Overcast
28°
9%
15:00
Overcast
28°
9%
16:00
Overcast
28°
9%
17:00
Overcast
27°
10%
18:00
Overcast
24°
13%
19:00
Overcast
20°
17%

14-Day Forecast for Merrimack

Sun, Aug 30
Overcast Overcast
27° / 13°
Mon, Aug 31
Overcast Overcast
28° / 15°
Tue, Sep 01
Patchy rain nearby Patchy rain nearby
19° / 15°
Wed, Sep 02
Overcast Overcast
20° / 15°
Thu, Sep 03
Light rain shower Light rain shower
26° / 15°
Fri, Sep 04
Sunny Sunny
23° / 14°
Sat, Sep 05
Sunny Sunny
19° / 14°
Sun, Sep 06
Sunny Sunny
22° / 12°
Mon, Sep 07
Sunny Sunny
22° / 10°
Tue, Sep 08
Overcast Overcast
23° / 10°
Wed, Sep 09
Sunny Sunny
29° / 16°
Thu, Sep 10
Sunny Sunny
32° / 19°
Fri, Sep 11
Sunny Sunny
34° / 18°
Sat, Sep 12
Sunny Sunny
37° / 24°

Additional Forecasts for Merrimack

Air Quality

💨 US EPA Index 1 (Good)
CO (Carbon Monoxide) 154.0 μg/m³
O₃ (Ozone) 98.0 μg/m³
NO₂ (Nitrogen Dioxide) 2.3 μg/m³
SO₂ (Sulphur Dioxide) 1.2 μg/m³
PM2.5 (Fine particles) 8.0 μg/m³
PM10 (Coarse particles) 8.2 μg/m³

Historical Weather

Weather Forecasts for Other Cities in United States

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Best Time to Be Outside in Merrimack Tomorrow

There is no good daylight window left in Merrimack today. Tomorrow, the most comfortable window looks like 09:00 to 12:00, when it is around 22°C. It should stay dry through that window. No significant rain is expected in the next several hours.

Frequently Asked Questions about Weather in Merrimack

What is the temperature in Merrimack right now?

Merrimack is sitting at 25°C (77°F) right now, partly cloudy (feels like 24°C).

What's the weather like in Merrimack right now?

Current weather in Merrimack: Partly Cloudy, humidity 54%, wind 11 km/h W.

What is today's forecast for Merrimack?

Today in Merrimack: high 27°C, low 13°C, overcast. Chance of rain: 9%.

What is the 7-day weather forecast for Merrimack?

Daily highs and lows for Merrimack:

  • 2026-08-30: 27°C / 13°C
  • 2026-08-31: 28°C / 15°C
  • 2026-09-01: 19°C / 15°C
  • 2026-09-02: 20°C / 15°C
  • 2026-09-03: 26°C / 15°C
  • 2026-09-04: 23°C / 14°C
  • 2026-09-05: 19°C / 14°C
Is it going to rain in Merrimack today?

There is a 9% chance of rain in Merrimack today.

What is the wind speed in Merrimack right now?

Wind in Merrimack is currently 11 km/h (7 mph) from the W.

What is the UV index in Merrimack right now?

The UV index in Merrimack is currently 0 (low). Sun protection is recommended when the index is 3 or higher.

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