38.935°N, 77.447°W · station IADthr · 67 years of record
62°F
COLDEST SEP 7 SINCE 2025
forecast low · Sep 7
7-Day Forecast
NWS NDFD forecast low temperature for Sterling-Dulles Airport.
This Day in History
Every year's low on each of the next 7 forecast dates at Sterling-Dulles Airport — toggle a day below. The forecast line shows where it lands; the ringed bar is the coldest on record.
Ranks
#65 / 64
coldest Sep 2 in 64 yrs of record
Coldest Sep 2 ever
44°F
set in 1970
Mildest Sep 2 ever
73°F
set in 2000
Forecast low 74°F — 65th coldest Sep 2 of 64 years · record 44°F (1970) · coldest since 2025.
Ranks
#64 / 64
coldest Sep 3 in 64 yrs of record
Coldest Sep 3 ever
45°F
set in 1967
Mildest Sep 3 ever
77°F
set in 1993
Forecast low 74°F — 64th coldest Sep 3 of 64 years · record 45°F (1967) · coldest since 2025.
Ranks
#65 / 64
coldest Sep 4 in 64 yrs of record
Coldest Sep 4 ever
48°F
set in 1997
Mildest Sep 4 ever
73°F
set in 2012
Forecast low 74°F — 65th coldest Sep 4 of 64 years · record 48°F (1997) · coldest since 2025.
Ranks
#57 / 64
coldest Sep 5 in 64 yrs of record
Coldest Sep 5 ever
42°F
set in 1997
Mildest Sep 5 ever
74°F
set in 2023
Forecast low 69°F — 57th coldest Sep 5 of 64 years · record 42°F (1997) · coldest since 2025.
Ranks
#40 / 64
coldest Sep 6 in 64 yrs of record
Coldest Sep 6 ever
47°F
set in 1982
Mildest Sep 6 ever
72°F
set in 2012
Forecast low 63°F — 40th coldest Sep 6 of 64 years · record 47°F (1982) · coldest since 2025.
Ranks
#38 / 64
coldest Sep 7 in 64 yrs of record
Coldest Sep 7 ever
45°F
set in 1962
Mildest Sep 7 ever
72°F
set in 1996
Forecast low 62°F — 38th coldest Sep 7 of 64 years · record 45°F (1962) · coldest since 2025.
Ranks
#40 / 64
coldest Sep 8 in 64 yrs of record
Coldest Sep 8 ever
41°F
set in 1976
Mildest Sep 8 ever
71°F
set in 1978
Forecast low 63°F — 40th coldest Sep 8 of 64 years · record 41°F (1976) · coldest since 2025.
The hottest and coldest ever recorded at Sterling-Dulles Airport in each calendar month, and for the whole 1960–2026 record — with the year each was set.
Month
Record High
Record Low
Jan
79°FJan 26, 2024
-18°FJan 22, 1984
Feb
80°FFeb 21, 2018
-14°FFeb 18, 1979
Mar
89°FMar 12, 1990
-1°FMar 15, 1993
Apr
93°FApr 25, 1960
17°FApr 1, 1969
May
97°FMay 29, 1969
28°FMay 7, 1970
Jun
102°FJun 29, 2012
36°FJun 8, 1977
Jul
105°FJul 22, 2011
41°FJul 1, 1988
Aug
104°FAug 20, 1983
38°FAug 29, 1982
Sep
100°FSep 6, 2023
30°FSep 24, 1974
Oct
96°FOct 2, 2019
15°FOct 24, 1969
Nov
84°FNov 2, 1971
9°FNov 24, 1989
Dec
79°FDec 6, 1998
-4°FDec 25, 1989
All-time
105°FJul 22, 2011
-18°FJan 22, 1984
2026 Records So Far
Records set or tied at Sterling-Dulles Airport so far this year — through Aug 30.
Record Highs in 2026
13 broke
plus 2 tied — daily record highs set this year
Record Lows in 2026
1 broke
plus 0 tied — daily record lows set this year
Record Warm Nights & Cold Days
Two more daily records, kept separate from the rankings: the warmest a night has ever stayed (record high minimum) and the coldest a day has ever gotten (record low maximum) — the flip side of the usual record high and low.
Warmest low ever
81°F
record high minimum — the night it never cooled · Jul 16, 2026
Coldest high ever
6°F
record low maximum — the day it never warmed · Jan 19, 1994
Month
Warmest low
Coldest high
Jan
62°FJan 8, 1998
6°FJan 19, 1994
Feb
59°FFeb 21, 2018
8°FFeb 18, 1979
Mar
66°FMar 30, 2025
18°FMar 1, 1980
Apr
68°FApr 27, 2011
38°FApr 8, 1972
May
71°FMay 31, 1991
47°FMay 1, 1963
Jun
78°FJun 23, 2024
56°FJun 3, 1997
Jul
81°FJul 16, 2026
66°FJul 13, 1990
Aug
79°FAug 8, 2007
64°FAug 12, 1979
Sep
77°FSep 3, 1993
47°FSep 28, 1984
Oct
73°FOct 8, 2017
39°FOct 30, 2002
Nov
68°FNov 1, 1971
30°FNov 30, 1976
Dec
63°FDec 24, 2015
11°FDec 25, 1983
All-time
81°FJul 16, 2026
6°FJan 19, 1994
Cold Streaks
Current run
0 days
consecutive days with a low ≤ 32°F
Longest ever
54 days
record run, ended Feb 12 1977
So far in 2026
61 days
days with a low ≤ 32°F this year
Climate Normals
Normal low & low by month, from Sterling-Dulles Airport's own 1991–2020 record. Today's normal low: 61°F · forecast is +1° vs normal.
Sterling-Dulles Airport's observed daily low for the last six weeks — a white ring marks any day that broke or tied its daily record for that date.
2026 So Far
Every day this year against Sterling-Dulles Airport's own record — the record low, the normal, and the full span ever seen. A shareable look at where the year stands.
Each cell is one day's low at Sterling-Dulles Airport, coloured by temperature — 67 years of record, so heat waves read as warm streaks and cold snaps as blue.
Days Below the Mark
How many days a year hit a given low at Sterling-Dulles Airport — counted through Sep 7 each year, so you can see whether 2026 is running cold. Pick a threshold:
61 days ≤32°F so far in 2026 — the 53rd most in 67 years. Normal for this point: 66. Record: 85 in 1970.
Share Card
A ready-to-share summary of Sterling-Dulles Airport's outlook — post it, or link this page.
