Monthly outlook for Sellman, MD: average high 82.7°, average low 64.8°. That is 0.5° below the climate normal for August. Precipitation is expected on 7 days (about 1.9 inches), against a normal of 6 days and 2.0 inches. The warmest day looks like 10 August (93°), the coolest 15 August (55.1°).
82.7°/64.8°
Average high / low
−0.5°
Below normal
7 / 6
Wet days / normal
1.9 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
84.6°
84.2°
+0.2°
18 August – 27 August
79.5°
82.8°
-1.8°
28 August – 6 September
at normal
82°
—
August records over 66 years
99.7°17 August 1988All-time high
50°29 August 1982All-time low
Climate normals and records are computed from the nearest reference point — Germantown (7 mi).
Sun, 0988° / 71°0
88 °
Sellman, Sunday, 9 August
Mostly clear. High 88°, low 71°.
Pressure30.03 inHg
Wind8.2 mph NW
Humidity48%
Visibility6.2 mi
Dew point66°
Mon, 1093° / 69°0.85
93 °
Sellman, Monday, 10 August
Heavy rain. High 93°, low 69°.
Pressure30.03 inHg
Wind9 mph NW
Humidity53%
Visibility6.2 mi
Dew point66°
Tue, 1190° / 68°0.04
90 °
Sellman, Tuesday, 11 August
Light rain. High 90°, low 68°.
Pressure29.97 inHg
Wind8.9 mph W
Humidity55%
Visibility6.2 mi
Dew point65°
Wed, 1284° / 69°0.06
84 °
Sellman, Wednesday, 12 August
Light rain. High 84°, low 69°.
Pressure29.83 inHg
Wind8 mph W
Humidity68%
Visibility6.2 mi
Dew point68°
Thu, 1387° / 69°0.07
87 °
Sellman, Thursday, 13 August
Light rain. High 87°, low 69°.
Pressure29.83 inHg
Wind11.9 mph NW
Humidity47%
Visibility—
Dew point62°
Fri, 1475° / 61°0.41
75 °
Sellman, Friday, 14 August
Rain. High 75°, low 61°.
Pressure30.00 inHg
Wind9 mph S
Humidity62%
Visibility—
Dew point56°
Sat, 1578° / 55°0
78 °
Sellman, Saturday, 15 August
Clear. High 78°, low 55°.
Pressure30.21 inHg
Wind8.4 mph N
Humidity39%
Visibility—
Dew point47°
Sun, 1678° / 56°0
78 °
Sellman, Sunday, 16 August
Clear. High 78°, low 56°.
Pressure30.30 inHg
Wind5.6 mph E
Humidity37%
Visibility—
Dew point47°
Mon, 1785° / 61°0
85 °
Sellman, Monday, 17 August
Mostly clear. High 85°, low 61°.
Pressure30.12 inHg
Wind7.5 mph S
Humidity48%
Visibility—
Dew point60°
Tue, 1872° / 67°0.16
72 °
Sellman, Tuesday, 18 August
Light rain. High 72°, low 67°.
Pressure29.97 inHg
Wind7.3 mph S
Humidity88%
Visibility—
Dew point68°
Wed, 1986° / 67°0.02
86 °
Sellman, Wednesday, 19 August
Light rain. High 86°, low 67°.
Pressure29.88 inHg
Wind8.3 mph NW
Humidity42%
Visibility—
Dew point57°
Thu, 2082° / 62°0
82 °
Sellman, Thursday, 20 August
Overcast. High 82°, low 62°.
Pressure29.97 inHg
Wind5.5 mph E
Humidity47%
Visibility—
Dew point57°
Fri, 2175° / 66°0.32
75 °
Sellman, Friday, 21 August
Light rain. High 75°, low 66°.
Pressure29.85 inHg
Wind10.5 mph S
Humidity89%
Visibility—
Dew point71°
Sat, 2286° / 66°0
86 °
Sellman, Saturday, 22 August
Clear. High 86°, low 66°.
Pressure29.80 inHg
Wind9.6 mph NW
Humidity41%
Visibility—
Dew point56°
Sun, 2376° / 59°0
76 °
Sellman, Sunday, 23 August
Mostly clear. High 76°, low 59°.
Pressure30.06 inHg
Wind16.3 mph NW
Humidity29%
Visibility—
Dew point37°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2483° / 65°0.07
83 °
Sellman, Monday, 24 August
Climate normal for this date — 60-year average.
Average high83°
Average low65°
Average precipitation0.07 in
Chance of precipitation22%
Record high94° (1995)
Record low54° (1994)
Tue, 2583° / 65°0.06
83 °
Sellman, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high83°
Average low65°
Average precipitation0.06 in
Chance of precipitation20%
Record high95° (1968)
Record low55° (1971)
Wed, 2684° / 66°0.06
84 °
Sellman, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high84°
Average low66°
Average precipitation0.06 in
Chance of precipitation27%
Record high94° (1975)
Record low55° (1963)
Thu, 2784° / 67°0.14
84 °
Sellman, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high84°
Average low67°
Average precipitation0.14 in
Chance of precipitation38%
Record high94° (1987)
Record low57° (1969)
Fri, 2884° / 67°0.15
84 °
Sellman, Friday, 28 August
Climate normal for this date — 60-year average.
Average high84°
Average low67°
Average precipitation0.15 in
Chance of precipitation43%
Record high96° (1973)
Record low56° (1968)
Sat, 2983° / 67°0.1
83 °
Sellman, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high83°
Average low67°
Average precipitation0.1 in
Chance of precipitation33%
Record high96° (1973)
Record low50° (1982)
Sun, 3083° / 65°0.06
83 °
Sellman, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high83°
Average low65°
Average precipitation0.06 in
Chance of precipitation25%
Record high95° (1991)
Record low50° (1986)
Mon, 3182° / 66°0.09
82 °
Sellman, Monday, 31 August
Climate normal for this date — 60-year average.
Average high82°
Average low66°
Average precipitation0.09 in
Chance of precipitation25%
Record high96° (1973)
Record low53° (1976)
Tue, 0181° / 64°0.11
81 °
Sellman, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high81°
Average low64°
Average precipitation0.11 in
Chance of precipitation30%
Record high96° (1973)
Record low54° (1967)
Wed, 0282° / 64°0.11
82 °
Sellman, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high82°
Average low64°
Average precipitation0.11 in
Chance of precipitation38%
Record high95° (1980)
Record low53° (1967)
Thu, 0382° / 64°0.11
82 °
Sellman, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high82°
Average low64°
Average precipitation0.11 in
Chance of precipitation25%
Record high95° (2023)
Record low50° (1967)
Fri, 0481° / 65°0.09
81 °
Sellman, Friday, 4 September
Climate normal for this date — 60-year average.
Average high81°
Average low65°
Average precipitation0.09 in
Chance of precipitation28%
Record high96° (2023)
Record low53° (1997)
Sat, 0581° / 64°0.14
81 °
Sellman, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high81°
Average low64°
Average precipitation0.14 in
Chance of precipitation28%
Record high97° (2023)
Record low52° (1997)
Sun, 0680° / 64°0.26
80 °
Sellman, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.26 in
Chance of precipitation35%
Record high97° (2023)
Record low52° (2000)
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 Sellman, 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 Sellman, 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.