• Today

    Apr 18

    68°Lo 43°

    An afternoon shower

    Low ragweed pollen levels
    • Grass
      Pollen
      0 - Low
    • Ragweed
      Pollen
      0 - Low
    • Tree
      Pollen
      350 - High
  • Sun

    Apr 19

    58°Lo 40°

    Mostly sunny

    Low ragweed pollen levels
    • Grass
      Pollen
      0 - Low
    • Ragweed
      Pollen
      0 - Low
    • Tree
      Pollen
      350 - High
    more
  • Mon

    Apr 20

    47°Lo 44°

    Breezy and colder with rain

    Low ragweed pollen levels
    • Grass
      Pollen
      0 - Low
    • Ragweed
      Pollen
      0 - Low
    • Tree
      Pollen
      350 - High
    more
  • Tue

    Apr 21

    61°Lo 38°

    Warmer with a shower or two

    Low ragweed pollen levels
    • Precip
      61%
    • Wind
      Speed
      8 mph
    • Cloud
      Cover
      86%
    more
  • Wed

    Apr 22

    58°Lo 37°

    Mostly cloudy

    Ragweed Pollen Weather
    • Precip
      25%
    • Wind
      Speed
      12 mph
    • Cloud
      Cover
      41%
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Sat
8am
9am 10am 11am 12pm 1pm 2pm 3pm
  8am 9am 10am 11am 12pm 1pm 2pm 3pm
Forecast
Cloudy
Mostly Cloudy
Partly Cloudy
Partly Sunny
Partly Cloudy
Partly Cloudy
Mostly Cloudy
Mostly Cloudy
Temp (°F) 44° 47° 50° 54° 58° 63° 68° 67°
RealFeel® 47° 52° 58° 63° 66° 69° 71° 69°
Humidity 93% 81% 67% 58% 50% 41% 34% 35%
   
  8am 9am 10am 11am 12pm 1pm 2pm 3pm
Rain
 
7%
 
7%
 
6%
 
5%
 
5%
 
8%
 
43%
 
47%
Snow
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
Ice
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
   
  8am 9am 10am 11am 12pm 1pm 2pm 3pm
Wind (mph) 2 NE 4 E 4 E 5 ESE 6 ESE 7 SW 8 SW 8 WSW
UV Index 1 2 3 4 5 5 4 3
Cloud Cover 95% 78% 54% 49% 53% 65% 77% 81%
Dew Point 42° 41° 40° 40° 40° 39° 39° 38°
Middle Grid line 70 F Middle Grid line 65 F Middle Grid line 60 F Middle Grid line 55 F Middle Grid line 50 F Middle Grid line 45 F Middle Grid line 40 F

Temperature History - Apr 18

more Historical Weather Data >
  Today Normal Record 4/18/2014
High 68° 59° 92° (1976) 47°
Low 43° 34° 23° (2003) 25°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:00 AM with 13:32 of sunlight, then sets at 7:32 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 5:59 AM with 13:37 of moolight, then sets at 7:36 PM

Merrimack Weather Report

2015 Boston Marathon Forecast: Rain and Wind in Store for Runners

April 18, 2015; 6:38 AM ET

The 119th Boston Marathon will take place on Monday, April 20, and runners set to take on the historic course will face cool and rainy conditions. more >

Sat. Pollen

Sat. Dust & Dander

Sat. Wind Maps