Washington DC Average Temperatures by Month

The numbers here tell you how hot and cold the weather usually is in Washington DC during each month of the year.

The average high and low temperatures are listed below monthly and annually for Washington, in both degrees Fahrenheit and Celsius.

Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.

To find out how often it rises over 70, 80 or 90 °F each month in the capital city, scroll down farther. There are also monthly and yearly counts of days with cold weather.

The first set of high and low temperatures are averages for 2010 to 2019. Everything else here is based on 1981 to 2010 weather recorded at the Ronald Reagan Washington National Airport in Arlington, Virginia.

10-year temperature averages for Washington DC, 2010 to 2019
High °F	Low °F		High °C	Low °C
44	29	January	7	-1
48	32	February	9	0
57	39	March	14	4
69	49	April	21	10
78	60	May	25	16
86	69	June	30	20
91	74	July	33	23
88	71	August	31	22
82	66	September	28	19
70	54	October	21	12
58	41	November	14	5
50	36	December	10	2
68	52	Year	20	11

30-year temperature averages for Washington DC, 1981 to 2010
High °F	Low °F		High °C	Low °C
43	29	January	6	-2
47	31	February	8	-1
56	38	March	13	3
67	47	April	19	8
75	57	May	24	14
84	66	June	29	19
88	71	July	31	22
87	70	August	30	21
80	62	September	26	17
68	51	October	20	10
58	41	November	14	5
47	33	December	8	0
67	50	Year	19	10

Days of Hot Weather in Washington DC

On the hottest days in Washington DC, the thermometer reaches into the 90s Fahrenheit. Hot weather generally shows up periodically from May to September. Some years even get a 90-plus degrees day in April or October.

Temperatures sometimes climb to 100 degrees or more, but that's not a yearly event. A day with 100-degree heat can happen in July or August.

Days per month in Washington of at least 70, 80 or 90 °F
	70 °F 21 °C	80 °F 27 °C	90 °F 32 °C
January	0	0	0
February	1	0	0
March	1	1	0
April	11	3	0
May	23	10	1
June	29	23	6
July	31	29	12
August	31	27	8
September	27	14	2
October	13	3	0
November	3	0	0
December	1	0	0
Year	172	110	31

How Often Washington Has Cold Temperatures

Freezing night-time temperatures can arrive anytime in Washington from November to April. Normally the thermometer doesn't get above 32 °F on eight days a year. Crisp days can occur during December, January or February, and even in March.

The coldest nights in the capital drop down to 0 degrees F (-18 °C). A night that chilly is rare though, happening only about once a decade, typically in January. Even lows in the 10 to 19 degree range are uncommon here, occurring on average just once a year.

Days per month on average in Washington when the minimum temperature drops to 20, 32, or 40 °F or below
	20 °F -8 °C	32 °F 0 °C	40 °F 4 °C
January	6	19	28
February	2	16	25
March	0	7	19
April	0	1	5
May	0	0	0
June	0	0	0
July	0	0	0
August	0	0	0
September	0	0	0
October	0	0	2
November	0	4	14
December	2	15	26
Year	10	61	120

Washington DC Temperatures: Averages by Month

Days of Hot Weather in Washington DC

How Often Washington Has Cold Temperatures

References

More on Weather at Washington DC