• Today

    Jul 28

    90°Lo 71°

    A heavy afternoon t-storm

    Moderate ragweed pollen levels
    • Grass
      Pollen
      3 - Moderate
    • Ragweed
      Pollen
      3 - Moderate
    • Tree
      Pollen
      1 - Low
  • Fri

    Jul 29

    83°Lo 67°

    Not as hot; morning t-storms

    Moderate ragweed pollen levels
    • Grass
      Pollen
      3 - Moderate
    • Ragweed
      Pollen
      3 - Moderate
    • Tree
      Pollen
      1 - Low
    more
  • Sat

    Jul 30

    85°Lo 70°

    Thunderstorms possible

    Low ragweed pollen levels
    • Grass
      Pollen
      3 - Moderate
    • Ragweed
      Pollen
      1 - Low
    • Tree
      Pollen
      1 - Low
    more
  • Sun

    Jul 31

    86°Lo 67°

    Mostly cloudy with a t-storm

    Moderate ragweed pollen levels
    • Grass
      Pollen
      3 - Moderate
    • Ragweed
      Pollen
      3 - Moderate
    • Tree
      Pollen
      1 - Low
    more
  • Mon

    Aug 1

    87°Lo 66°

    Mostly cloudy with a t-storm

    Low ragweed pollen levels
    • Grass
      Pollen
      1 - Low
    • Ragweed
      Pollen
      1 - Low
    • Tree
      Pollen
      1 - Low
    more
Next Previous
Next 8 hours >
  Thu
12pm
1pm 2pm 3pm 4pm 5pm 6pm 7pm
  12pm 1pm 2pm 3pm 4pm 5pm 6pm 7pm
Forecast
T-storms
T-storms
Partly Cloudy
Partly Cloudy
T-storms
Partly Cloudy
Partly Cloudy
Partly Cloudy
Temp (°F) 86° 89° 90° 89° 83° 84° 84° 83°
RealFeel® 99° 105° 106° 104° 95° 94° 92° 91°
Humidity 62% 62% 58% 60% 79% 73% 70% 73%
   
  12pm 1pm 2pm 3pm 4pm 5pm 6pm 7pm
Rain
 
51%
 
51%
 
47%
 
47%
 
51%
 
40%
 
34%
 
38%
Snow
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
Ice
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
   
  12pm 1pm 2pm 3pm 4pm 5pm 6pm 7pm
Wind (mph) 2 S 2 S 4 S 4 S 4 S 5 SSE 5 SSE 4 WNW
UV Index 6 6 5 4 3 2 1 0
Cloud Cover 67% 70% 70% 70% 70% 70% 70% 70%
Dew Point 72° 74° 74° 74° 76° 74° 73° 74°
Middle Grid line 95 F Middle Grid line 90 F Middle Grid line 85 F Middle Grid line 80 F

Temperature History - Jul 28

more Historical Weather Data >
  Today Normal Record 7/28/2015
High 90° 85° N/A 90°
Low 71° 69° N/A 70°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:06 AM with 14:17 of sunlight, then sets at 8:23 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 1:24 AM with 14:07 of moolight, then sets at 3:31 PM

Rockville Weather Report

Torrential downpours in northeastern US to ease heat wave, raise flash flood risk

July 28, 2016; 11:11 AM ET

As July draws to a close, a storm system swinging up from the Deep South will bring downpours to the northeastern U.S. and break the back of an extended heat wave. more >

Thu. Pollen

Thu. Dust & Dander

Thu. Wind Maps