Following showers and thunderstorms early in the week, cooler air will move into the Washington, D.C., area by midweek.
With lower humidity, temperatures will drop temperatures to 5 degrees below average for the end of July.
Cool weather sticks around through the middle of the week with highs persisting into the low to mid-80s each afternoon. The biggest change will be the lower humidity as dew points stay in the 50s until late in the week.
Late in the week, a storm system from the southern Plains will move in some more humidity and the next chance for rain and thunderstorms for Friday.
A tropical wave is likely to become the Atlantic Basin's next tropical storm as it approaches or crosses the Caribbean Sea later this week.
Bouts of wet weather will soak the northeastern United States during the last full week of September.
Typhoon Megi will threaten lives and property across Taiwan and eastern China into the middle of the week.
Gusty winds will accompany a push of chilly air across the Great Lakes through Tuesday.
The final day of September will bring a rare lunar event that hasn’t occurred since March of 2014, a Black Moon.
Following some rain and gusty winds on Tuesday, a strong storm will target the United Kingdom on Thursday.