Washington DC - Recent September Temperatures and Rainfall





The numbers here describe what the September weather in Washington DC was like for every year since 2010. A series of tables gives September data by year for temperature and precipitation.

They begin with average maximum and minimum temperatures in degrees Fahrenheit and Celsius. That's followed by how many really hot days occurred each September. Then there's information on how much rain actually landed this month during recent years, as well as how often Washington had wet weather.

The climate data come from weather measurements made at the Reagan National Airport near downtown Washington.

Temperature Weather iconTemperature

September temperature averages by year in Washington
High °F Low °F Year High °C Low °C
82 69 2018 28 21
81 64 2017 27 18
83 69 2016 29 20
84 66 2015 29 19
82 66 2014 28 19
81 62 2013 27 17
81 64 2012 27 18
78 65 2011 25 18
85 66 2010 30 19
Number of days in September when the temperature in Washington rose to at least 70 or 90 degrees Fahrenheit
Year 70 °F
21 °C
90 °F
32 °C
2018 27 5
2017 29 3
2016 29 7
2015 30 7
2014 29 6
2013 29 6
2012 30 3
2011 26 0
2010 29 10

Rainy Weather iconRain

This table gives the total precipitation that fell on Washington during September in each year from 2010. The number of days with precipitation counts the days when rainfall amounted to 0.01 inches (0.3 millimeters) or more.

Total rainfall for September in Washington
Days Year Inches Milli­metres
16 2018 9.7 247
4 2017 1.4 36
8 2016 2.5 64
4 2015 2.2 55
6 2014 1.1 28
5 2013 1.2 31
10 2012 4.3 109
14 2011 8.8 225
7 2010 6.0 153
Reference

Jay Lawrimore. 2016. Global Summary of the Month, Version 1.0. NOAA National Centers for Environmental Information. 

Washington DC - Recent Years
Washington DC - Extremes
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