National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Manchester Airport (KMHT)

Lat: 42.93°NLon: 71.44°WElev: 223ft.

Mostly Cloudy

88°F

31°C

Humidity 52%
Wind Speed Vrbl 3 mph
Barometer 30.01 in (1017.0 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index92°F (33°C)
Last update 15 Jul 12:53 pm EDT
Extended Forecast for

Merrimack NH

Heat Advisory until July 15, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory until July 15, 08:00pm

    NOW until 8:00pm Tue

    Heat Advisory

  • This Afternoon

    High: 91 °F

    Haze

  • Tonight

    Tonight: Widespread haze between 8pm and 10pm. Patchy fog after 2am. Otherwise, mostly clear, with a low around 68. Calm wind.

    Low: 68 °F

    Haze then
    Patchy Fog

  • Wednesday

    Wednesday: Patchy fog before 8am. Otherwise, sunny and hot, with a high near 93. Heat index values as high as 101. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 93 °F

    Patchy Fog
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers after 2am. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 73. South wind around 5 mph becoming calm in the evening.

    Low: 73 °F

    Mostly Cloudy
    then Chance
    Showers and
    Patchy Fog

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 11am. Patchy fog before 7am. Otherwise, partly sunny and hot, with a high near 91. Southwest wind around 5 mph. Chance of precipitation is 50%.

    High: 91 °F

    Chance
    Showers and
    Patchy Fog
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: Scattered thunderstorms before 8pm. Partly cloudy, with a low around 72. Chance of precipitation is 30%.

    Low: 72 °F

    Scattered
    T-storms then
    Partly Cloudy

  • Friday

    Friday: A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers before 8pm. Partly cloudy, with a low around 62.

    Low: 62 °F

    Chance
    Showers then
    Partly Cloudy

Detailed Forecast

This Afternoon
Widespread haze after 5pm. Mostly sunny and hot, with a high near 91. Heat index values as high as 96. Southwest wind around 5 mph.
Tonight
Widespread haze between 8pm and 10pm. Patchy fog after 2am. Otherwise, mostly clear, with a low around 68. Calm wind.
Wednesday
Patchy fog before 8am. Otherwise, sunny and hot, with a high near 93. Heat index values as high as 101. Calm wind becoming southwest around 5 mph in the afternoon.
Wednesday Night
A 30 percent chance of showers after 2am. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 73. South wind around 5 mph becoming calm in the evening.
Thursday
A chance of showers, with thunderstorms also possible after 11am. Patchy fog before 7am. Otherwise, partly sunny and hot, with a high near 91. Southwest wind around 5 mph. Chance of precipitation is 50%.
Thursday Night
Scattered thunderstorms before 8pm. Partly cloudy, with a low around 72. Chance of precipitation is 30%.
Friday
A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 86.
Friday Night
A 30 percent chance of showers before 8pm. Partly cloudy, with a low around 62.
Saturday
Mostly sunny, with a high near 85.
Saturday Night
Partly cloudy, with a low around 63.
Sunday
A 40 percent chance of showers. Partly sunny, with a high near 83.
Sunday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 64.
Monday
Mostly sunny, with a high near 82.
Basemap Options
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Merrimack NH
 42.86°N 71.49°W (Elev. 118 ft)
Last Update:
8:18 am EDT Jul 15, 2025
Forecast Valid:
1pm EDT Jul 15, 2025-6pm EDT Jul 21, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation