Monthly outlook for Vienna, MD: average high 83.4°, average low 67.5°. That is 0.1° below the climate normal for August. Precipitation is expected on 6 days (about 1.7 inches), against a normal of 7 days and 2.6 inches. The warmest day looks like 10 August (94.3°), the coolest 15 August (57.7°).
83.4°/67.5°
Average high / low
−0.1°
Below normal
6 / 7
Wet days / normal
1.7 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
84.9°
84.3°
+0.4°
18 August – 27 August
80.9°
82.9°
-1.1°
28 August – 6 September
at normal
82.2°
—
August records over 66 years
96.8°8 August 2007All-time high
50.9°30 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Salisbury (15 mi).
Sun, 0991° / 74°0
91 °
Vienna, Sunday, 9 August
Overcast. High 91°, low 74°.
Pressure30.03 inHg
Wind6.2 mph W
Humidity54%
Visibility6.2 mi
Dew point70°
Mon, 1094° / 77°0
94 °
Vienna, Monday, 10 August
Overcast. High 94°, low 77°.
Pressure30.00 inHg
Wind6.2 mph W
Humidity49%
Visibility6.2 mi
Dew point69°
Tue, 1189° / 71°0.02
89 °
Vienna, Tuesday, 11 August
Light rain. High 89°, low 71°.
Pressure29.94 inHg
Wind11.5 mph W
Humidity56%
Visibility6.2 mi
Dew point67°
Wed, 1287° / 71°0.01
87 °
Vienna, Wednesday, 12 August
Light rain. High 87°, low 71°.
Pressure29.83 inHg
Wind7.7 mph NW
Humidity55%
Visibility6.2 mi
Dew point67°
Thu, 1390° / 73°0.05
90 °
Vienna, Thursday, 13 August
Light rain. High 90°, low 73°.
Pressure29.80 inHg
Wind13.6 mph NW
Humidity43%
Visibility—
Dew point63°
Fri, 1470° / 61°0.92
70 °
Vienna, Friday, 14 August
Rain. High 70°, low 61°.
Pressure30.00 inHg
Wind9.1 mph NE
Humidity90%
Visibility—
Dew point62°
Sat, 1576° / 58°0
76 °
Vienna, Saturday, 15 August
Clear. High 76°, low 58°.
Pressure30.21 inHg
Wind10.2 mph NW
Humidity43%
Visibility—
Dew point50°
Sun, 1678° / 58°0
78 °
Vienna, Sunday, 16 August
Clear. High 78°, low 58°.
Pressure30.27 inHg
Wind6.2 mph SE
Humidity40%
Visibility—
Dew point50°
Mon, 1783° / 63°0
83 °
Vienna, Monday, 17 August
Mostly clear. High 83°, low 63°.
Pressure30.15 inHg
Wind11.8 mph SW
Humidity50%
Visibility—
Dew point61°
Tue, 1878° / 71°0.16
78 °
Vienna, Tuesday, 18 August
Light rain. High 78°, low 71°.
Pressure30.00 inHg
Wind13.2 mph S
Humidity69%
Visibility—
Dew point67°
Wed, 1986° / 70°0.06
86 °
Vienna, Wednesday, 19 August
Light rain. High 86°, low 70°.
Pressure29.85 inHg
Wind10.8 mph NW
Humidity52%
Visibility—
Dew point65°
Thu, 2084° / 65°0
84 °
Vienna, Thursday, 20 August
Overcast. High 84°, low 65°.
Pressure29.94 inHg
Wind6.3 mph SE
Humidity44%
Visibility—
Dew point57°
Fri, 2178° / 68°0.3
78 °
Vienna, Friday, 21 August
Light rain. High 78°, low 68°.
Pressure29.91 inHg
Wind14.5 mph S
Humidity80%
Visibility—
Dew point70°
Sat, 2286° / 69°0
86 °
Vienna, Saturday, 22 August
Light rain. High 86°, low 69°.
Pressure29.77 inHg
Wind11.2 mph NW
Humidity51%
Visibility—
Dew point63°
Sun, 2373° / 59°0
73 °
Vienna, Sunday, 23 August
Overcast. High 73°, low 59°.
Pressure30.03 inHg
Wind15 mph N
Humidity33%
Visibility—
Dew point41°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2482° / 67°0.08
82 °
Vienna, Monday, 24 August
Climate normal for this date — 60-year average.
Average high82°
Average low67°
Average precipitation0.08 in
Chance of precipitation27%
Record high92° (1968)
Record low59° (1994)
Tue, 2583° / 68°0.06
83 °
Vienna, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high83°
Average low68°
Average precipitation0.06 in
Chance of precipitation17%
Record high95° (1968)
Record low58° (1994)
Wed, 2683° / 68°0.06
83 °
Vienna, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high83°
Average low68°
Average precipitation0.06 in
Chance of precipitation28%
Record high94° (1975)
Record low58° (1977)
Thu, 2784° / 69°0.14
84 °
Vienna, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high84°
Average low69°
Average precipitation0.14 in
Chance of precipitation30%
Record high94° (1987)
Record low59° (1963)
Fri, 2884° / 70°0.2
84 °
Vienna, Friday, 28 August
Climate normal for this date — 60-year average.
Average high84°
Average low70°
Average precipitation0.2 in
Chance of precipitation43%
Record high94° (2024)
Record low59° (1969)
Sat, 2983° / 69°0.11
83 °
Vienna, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high83°
Average low69°
Average precipitation0.11 in
Chance of precipitation38%
Record high93° (1973)
Record low52° (1986)
Sun, 3083° / 68°0.08
83 °
Vienna, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high83°
Average low68°
Average precipitation0.08 in
Chance of precipitation33%
Record high93° (2010)
Record low51° (1986)
Mon, 3183° / 68°0.08
83 °
Vienna, Monday, 31 August
Climate normal for this date — 60-year average.
Average high83°
Average low68°
Average precipitation0.08 in
Chance of precipitation23%
Record high93° (2010)
Record low53° (1986)
Tue, 0181° / 68°0.26
81 °
Vienna, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high81°
Average low68°
Average precipitation0.26 in
Chance of precipitation35%
Record high94° (2010)
Record low55° (1986)
Wed, 0282° / 67°0.11
82 °
Vienna, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high82°
Average low67°
Average precipitation0.11 in
Chance of precipitation35%
Record high94° (1980)
Record low57° (1967)
Thu, 0382° / 68°0.11
82 °
Vienna, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high82°
Average low68°
Average precipitation0.11 in
Chance of precipitation38%
Record high92° (1984)
Record low53° (1967)
Fri, 0482° / 67°0.13
82 °
Vienna, Friday, 4 September
Climate normal for this date — 60-year average.
Average high82°
Average low67°
Average precipitation0.13 in
Chance of precipitation27%
Record high93° (2008)
Record low57° (1997)
Sat, 0581° / 67°0.09
81 °
Vienna, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high81°
Average low67°
Average precipitation0.09 in
Chance of precipitation30%
Record high93° (2023)
Record low54° (1997)
Sun, 0681° / 67°0.18
81 °
Vienna, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high81°
Average low67°
Average precipitation0.18 in
Chance of precipitation40%
Record high95° (2023)
Record low57° (1982)
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Vienna, MD are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Vienna, MD since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.