Weather in September in Washington, District Of Columbia

< September >
	Normal Max/ High Temperature	27°C (80°F)
	Average Temperature	22°C (71°F)
	Min/ Low Temperature	17°C (62°F)
	Average Sea or Water Temp	25°C(77°F)
	Normal Precipitation	84mm (3.3in)
	Number of Wet Days (probability of rain on a day)	9 (30%)
	Average Sunlight per day	07h 34'
	Average Daylight per day	12h 23'
	Sunny (Cloudy) Daylight Hours	62% (38%)
	Sun altitude at solar noon on the 21st day.	51.7°

The average sea tempeature is 25 °C (77 °F).
The average temperature in Washington, District Of Columbia in September is really warm at 21.8 °C (71.24 °F).
Afternoons can be hot with average high temperatures reaching 26.7 °C (80.1 °F).
Overnight temperatures are generally very mild with an average low of 16.9 °C (62.4 °F).
The mean daily temperature variation/ range in September is 9.8 °C (17.6 °F).
Precipitation averages for September are high with 84.1mm (3.3 in) recorded across 9 days.
The heavens above Washington, District Of Columbia are slightly sunny having on balance a welcome 7h 34' of brilliant solar radiation per day.
The shortest day is 11h 46' long and the longest day is 13h 00' long with an average length of 12h 23'.
There are approximately 4h 39' per day when the sun is occluded by cloud, haze, fog etc.
It is sunny approximately 62% of daylight hours and cloudy 38% of daylight hours.

Weather Trend Graph for September in Washington, District Of Columbia, Usa

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