Monthly outlook for Ewell, MD: average high 81.9°, average low 74.6°. That is 0.4° below the climate normal for August. Precipitation is expected on 5 days (about 0.9 inches), against a normal of 6 days and 2.6 inches. The warmest day looks like 8 August (89.8°), the coolest 14 August (68.4°).
81.9°/74.6°
Average high / low
−0.4°
Below normal
5 / 6
Wet days / normal
0.9 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
83.2°
83.1°
+0°
18 August – 27 August
79.8°
81.9°
-1.2°
28 August – 6 September
at normal
81.2°
—
August records over 66 years
95.4°20 August 1983All-time high
52.7°30 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Dames Quarter (14 mi).
Sun, 0987° / 79°0
87 °
Ewell, Sunday, 9 August
Overcast. High 87°, low 79°.
Pressure30.06 inHg
Wind6.4 mph NW
Humidity76%
Visibility6.2 mi
Dew point72°
Mon, 1088° / 79°0.02
88 °
Ewell, Monday, 10 August
Light rain. High 88°, low 79°.
Pressure30.00 inHg
Wind2.6 mph SW
Humidity71%
Visibility6.2 mi
Dew point71°
Tue, 1183° / 76°0.19
83 °
Ewell, Tuesday, 11 August
Rain. High 83°, low 76°.
Pressure29.94 inHg
Wind7.7 mph NW
Humidity70%
Visibility6.2 mi
Dew point68°
Wed, 1283° / 76°0.02
83 °
Ewell, Wednesday, 12 August
Light rain. High 83°, low 76°.
Pressure29.80 inHg
Wind12.9 mph W
Humidity81%
Visibility6.2 mi
Dew point72°
Thu, 1384° / 78°0.04
84 °
Ewell, Thursday, 13 August
Light rain. High 84°, low 78°.
Pressure29.83 inHg
Wind19.3 mph NW
Humidity70%
Visibility—
Dew point70°
Fri, 1478° / 68°0.06
78 °
Ewell, Friday, 14 August
Light rain. High 78°, low 68°.
Pressure30.09 inHg
Wind16.7 mph N
Humidity63%
Visibility—
Dew point57°
Sat, 1580° / 70°0
80 °
Ewell, Saturday, 15 August
Clear. High 80°, low 70°.
Pressure30.18 inHg
Wind20.6 mph N
Humidity49%
Visibility—
Dew point55°
Sun, 1679° / 71°0
79 °
Ewell, Sunday, 16 August
Mostly clear. High 79°, low 71°.
Pressure30.18 inHg
Wind20.7 mph S
Humidity52%
Visibility—
Dew point56°
Mon, 1780° / 77°0.01
80 °
Ewell, Monday, 17 August
Light rain. High 80°, low 77°.
Pressure30.12 inHg
Wind18.4 mph S
Humidity59%
Visibility—
Dew point62°
Tue, 1877° / 73°0.26
77 °
Ewell, Tuesday, 18 August
Light rain. High 77°, low 73°.
Pressure30.03 inHg
Wind20.1 mph S
Humidity70%
Visibility—
Dew point66°
Wed, 1980° / 72°0.28
80 °
Ewell, Wednesday, 19 August
Light rain. High 80°, low 72°.
Pressure29.91 inHg
Wind22 mph S
Humidity74%
Visibility—
Dew point68°
Thu, 2081° / 77°0
81 °
Ewell, Thursday, 20 August
Light rain. High 81°, low 77°.
Pressure29.74 inHg
Wind25.4 mph NW
Humidity65%
Visibility—
Dew point67°
Fri, 2181° / 72°0
81 °
Ewell, Friday, 21 August
Clear. High 81°, low 72°.
Pressure29.91 inHg
Wind22.9 mph NW
Humidity47%
Visibility—
Dew point53°
Sat, 2278° / 70°0
78 °
Ewell, Saturday, 22 August
Clear. High 78°, low 70°.
Pressure30.09 inHg
Wind19.3 mph S
Humidity43%
Visibility—
Dew point49°
Sun, 2382° / 77°0.02
82 °
Ewell, Sunday, 23 August
Light rain. High 82°, low 77°.
Pressure30.03 inHg
Wind25 mph S
Humidity74%
Visibility—
Dew point71°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2481° / 70°0.07
81 °
Ewell, Monday, 24 August
Climate normal for this date — 60-year average.
Average high81°
Average low70°
Average precipitation0.07 in
Chance of precipitation23%
Record high90° (1968)
Record low60° (2024)
Tue, 2582° / 70°0.06
82 °
Ewell, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high82°
Average low70°
Average precipitation0.06 in
Chance of precipitation20%
Record high92° (1968)
Record low60° (1971)
Wed, 2682° / 70°0.05
82 °
Ewell, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high82°
Average low70°
Average precipitation0.05 in
Chance of precipitation20%
Record high91° (1975)
Record low60° (1977)
Thu, 2783° / 72°0.13
83 °
Ewell, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high83°
Average low72°
Average precipitation0.13 in
Chance of precipitation30%
Record high93° (1987)
Record low63° (1963)
Fri, 2883° / 72°0.16
83 °
Ewell, Friday, 28 August
Climate normal for this date — 60-year average.
Average high83°
Average low72°
Average precipitation0.16 in
Chance of precipitation40%
Record high90° (1973)
Record low61° (1969)
Sat, 2982° / 71°0.11
82 °
Ewell, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high82°
Average low71°
Average precipitation0.11 in
Chance of precipitation30%
Record high91° (1973)
Record low56° (1982)
Sun, 3082° / 70°0.07
82 °
Ewell, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high82°
Average low70°
Average precipitation0.07 in
Chance of precipitation25%
Record high91° (1973)
Record low53° (1986)
Mon, 3182° / 70°0.08
82 °
Ewell, Monday, 31 August
Climate normal for this date — 60-year average.
Average high82°
Average low70°
Average precipitation0.08 in
Chance of precipitation23%
Record high91° (1973)
Record low56° (1986)
Tue, 0180° / 69°0.24
80 °
Ewell, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high80°
Average low69°
Average precipitation0.24 in
Chance of precipitation35%
Record high91° (2010)
Record low59° (1986)
Wed, 0280° / 69°0.09
80 °
Ewell, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high80°
Average low69°
Average precipitation0.09 in
Chance of precipitation37%
Record high91° (1980)
Record low59° (1967)
Thu, 0381° / 70°0.1
81 °
Ewell, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high81°
Average low70°
Average precipitation0.1 in
Chance of precipitation38%
Record high90° (1993)
Record low54° (1967)
Fri, 0481° / 70°0.14
81 °
Ewell, Friday, 4 September
Climate normal for this date — 60-year average.
Average high81°
Average low70°
Average precipitation0.14 in
Chance of precipitation25%
Record high89° (2008)
Record low58° (1997)
Sat, 0580° / 69°0.09
80 °
Ewell, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high80°
Average low69°
Average precipitation0.09 in
Chance of precipitation32%
Record high92° (2023)
Record low59° (1994)
Sun, 0680° / 69°0.19
80 °
Ewell, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high80°
Average low69°
Average precipitation0.19 in
Chance of precipitation38%
Record high92° (1983)
Record low60° (1962)
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 Ewell, 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 Ewell, 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.