Washington DC Recent September Temperatures, 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

September temperature averages by year in Washington
High °F	Low °F	Year	High °C	Low °C
82	65	2023	28	18
82	64	2022	28	18
82	65	2021	28	18
78	62	2020	26	17
86	67	2019	30	20
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
2023	27	6
2022	29	2
2021	30	2
2020	26	2
2019	30	9
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

Rain

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
11	2023	3.6	92
8	2022	2.3	58
7	2021	4.0	103
13	2020	5.5	141
5	2019	0.3	7
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

Washington DC - Recent September Temperatures and Rainfall

Temperature

Rain

Reference

More on Weather in Washington