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

Hazardous Weather Conditions

Current conditions at

Lawrence Municipal Airport (KLWM)

Lat: 42.71°NLon: 71.13°WElev: 135ft.

Light Rain

78°F

26°C

Humidity 79%
Wind Speed Vrbl 7 mph
Barometer 30.00 in (1015.9 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 30 Jun 6:54 pm EDT
Extended Forecast for

Merrimac MA

Extreme Heat Warning July 1, 10:00am until July 4, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning

  • Tonight

    Tonight: A slight chance of showers, then a chance of showers and thunderstorms after 8pm. Mostly cloudy, with a low around 69. Southwest wind around 6 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 69 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny and hot, with a high near 97. Heat index values as high as 107. West wind around 7 mph.

    High: 97 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 76. Southwest wind around 6 mph.

    Low: 76 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 101. Heat index values as high as 111. West wind around 7 mph.

    High: 101 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 79. West wind around 5 mph.

    Low: 79 °F

    Mostly Clear

  • Friday

    Friday: A slight chance of showers after 3pm. Sunny and hot, with a high near 100. West wind 6 to 8 mph. Chance of precipitation is 20%.

    High: 100 °F

    Sunny then
    Slight Chance
    Showers

  • Friday Night

    Friday Night: Mostly clear, with a low around 75. Light west wind.

    Low: 75 °F

    Mostly Clear

  • Independence Day

    Independence Day: A chance of showers and thunderstorms after 4pm. Mostly sunny and hot, with a high near 93. West wind around 6 mph. Chance of precipitation is 30%.

    High: 93 °F

    Sunny then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 9pm. Partly cloudy, with a low around 69. Calm wind. Chance of precipitation is 30%.

    Low: 69 °F

    Chance
    T-storms then
    Partly Cloudy

Detailed Forecast

Tonight
A slight chance of showers, then a chance of showers and thunderstorms after 8pm. Mostly cloudy, with a low around 69. Southwest wind around 6 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
Mostly sunny and hot, with a high near 97. Heat index values as high as 107. West wind around 7 mph.
Wednesday Night
Mostly clear, with a low around 76. Southwest wind around 6 mph.
Thursday
Sunny and hot, with a high near 101. Heat index values as high as 111. West wind around 7 mph.
Thursday Night
Mostly clear, with a low around 79. West wind around 5 mph.
Friday
A slight chance of showers after 3pm. Sunny and hot, with a high near 100. West wind 6 to 8 mph. Chance of precipitation is 20%.
Friday Night
Mostly clear, with a low around 75. Light west wind.
Independence Day
A chance of showers and thunderstorms after 4pm. Mostly sunny and hot, with a high near 93. West wind around 6 mph. Chance of precipitation is 30%.
Saturday Night
A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 9pm. Partly cloudy, with a low around 69. Calm wind. Chance of precipitation is 30%.
Sunday
Mostly sunny, with a high near 85. Light and variable wind becoming east around 6 mph in the morning.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 65. Calm wind. Chance of precipitation is 30%.
Monday
A chance of showers. Partly sunny, with a high near 81. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 30%.
Monday Night
A chance of showers. Partly cloudy, with a low around 63. Light and variable wind. Chance of precipitation is 30%.
Tuesday
Mostly sunny, with a high near 80. Calm wind becoming east around 6 mph in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Merrimac MA
 42.84°N 70.99°W (Elev. 98 ft)
Last Update:
3:34 pm EDT Jun 30, 2026
Forecast Valid:
7pm EDT Jun 30, 2026-6pm EDT Jul 7, 2026
 
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