• Today

    Apr 18

    68°Lo 41°

    Some sun, then clouds

    Neutral weather for arthritis pain
    • Rain
      0 in
    • Hours of Precip
      0
    • UV
      6 - High
  • Sun

    Apr 19

    57°Lo 39°

    Mostly sunny and cooler

    Beneficial weather for arthritis pain
    • Rain
      0 in
    • Hours of Precip
      0
    • UV
      6 - High
    more
  • Mon

    Apr 20

    50°Lo 49°

    Breezy and cooler with rain

    At Risk weather for arthritis pain
    • Rain
      0.76 in
    • Hours of Precip
      10
    • UV
      1 - Low
    more
  • Tue

    Apr 21

    63°Lo 41°

    Warmer with brief showers

    At Extreme Risk weather for arthritis pain
    • Rain
      0.06 in
    • Hours of Precip
      2.5
    • UV
      3 - Moderate
    more
  • Wed

    Apr 22

    60°Lo 40°

    Mostly cloudy

    At Risk weather for arthritis pain
    • Rain
      0 in
    • Hours of Precip
      0
    • UV
      6 - High
    more
Next Previous
Hi 68° RealFeel® 72° Precipitation 25%

Day

N

E

S

W

  • WSW 7 mph
  • Gusts: 14 mph

Some sunshine giving way to clouds; excessive dry weather will result in a high fire threat

  • Max UV Index: 6 (High)
  • Thunderstorms: 20%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs
Lo 41° RealFeel® 36° Precipitation 12%

Night

N

E

S

W

  • WNW 8 mph
  • Gusts: 14 mph

Clear

  • Max UV Index: N/A
  • Thunderstorms: 20%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs

Temperature History - Apr 18

more Historical Weather Data >
  Today Normal Record 4/18/2014
High 68° 59° N/A 46°
Low 41° 37° N/A 25°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:00 AM with 13:30 of sunlight, then sets at 7:30 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 5:59 AM with 13:35 of moolight, then sets at 7:34 PM

Waltham 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. Arthritis Pain

Sat. UV Index