Monthly outlook for Darby, PA: average high 82.5°, average low 68.3°. That is 0.1° below the climate normal for August. Precipitation is expected on 5 days (about 1.1 inches), against a normal of 6 days and 2.1 inches. The warmest day looks like 10 August (91.6°), the coolest 23 August (61.6°).
82.5°/68.3°
Average high / low
−0.1°
Below normal
5 / 6
Wet days / normal
1.1 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
84.7°
83.4°
+0.7°
18 August – 27 August
78.8°
81.9°
-1.7°
28 August – 6 September
at normal
80.8°
—
August records over 66 years
98.2°9 August 2001All-time high
48.4°30 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Drexel Hill (3 mi).
Sun, 0989° / 71°0.02
89 °
Darby, Sunday, 9 August
Light rain. High 89°, low 71°.
Pressure30.00 inHg
Wind7.1 mph W
Humidity45%
Visibility6.2 mi
Dew point65°
Mon, 1092° / 74°0.03
92 °
Darby, Monday, 10 August
Light rain. High 92°, low 74°.
Pressure30.00 inHg
Wind6.7 mph W
Humidity43%
Visibility6.2 mi
Dew point64°
Tue, 1188° / 73°0.1
88 °
Darby, Tuesday, 11 August
Rain. High 88°, low 73°.
Pressure29.91 inHg
Wind5.4 mph W
Humidity55%
Visibility6.2 mi
Dew point68°
Wed, 1283° / 73°0.53
83 °
Darby, Wednesday, 12 August
Rain. High 83°, low 73°.
Pressure29.80 inHg
Wind8 mph W
Humidity64%
Visibility6.2 mi
Dew point66°
Thu, 1388° / 71°0
88 °
Darby, Thursday, 13 August
Partly cloudy. High 88°, low 71°.
Pressure29.77 inHg
Wind12 mph NW
Humidity43%
Visibility—
Dew point61°
Fri, 1478° / 67°0.01
78 °
Darby, Friday, 14 August
Light rain. High 78°, low 67°.
Pressure29.97 inHg
Wind9.4 mph N
Humidity36%
Visibility—
Dew point47°
Sat, 1579° / 62°0
79 °
Darby, Saturday, 15 August
Clear. High 79°, low 62°.
Pressure30.18 inHg
Wind10.6 mph N
Humidity32%
Visibility—
Dew point43°
Sun, 1682° / 62°0
82 °
Darby, Sunday, 16 August
Clear. High 82°, low 62°.
Pressure30.27 inHg
Wind6.1 mph S
Humidity29%
Visibility—
Dew point44°
Mon, 1783° / 64°0
83 °
Darby, Monday, 17 August
Overcast. High 83°, low 64°.
Pressure30.15 inHg
Wind11.1 mph S
Humidity45%
Visibility—
Dew point57°
Tue, 1880° / 71°0.11
80 °
Darby, Tuesday, 18 August
Light rain. High 80°, low 71°.
Pressure29.97 inHg
Wind9.9 mph SW
Humidity89%
Visibility—
Dew point69°
Wed, 1986° / 70°0.01
86 °
Darby, Wednesday, 19 August
Light rain. High 86°, low 70°.
Pressure29.85 inHg
Wind9.4 mph NW
Humidity39%
Visibility—
Dew point56°
Thu, 2073° / 66°0
73 °
Darby, Thursday, 20 August
Overcast. High 73°, low 66°.
Pressure29.97 inHg
Wind5.6 mph N
Humidity57%
Visibility—
Dew point56°
Fri, 2176° / 67°0.2
76 °
Darby, Friday, 21 August
Light rain. High 76°, low 67°.
Pressure29.88 inHg
Wind11.5 mph S
Humidity79%
Visibility—
Dew point69°
Sat, 2284° / 68°0.02
84 °
Darby, Saturday, 22 August
Light rain. High 84°, low 68°.
Pressure29.77 inHg
Wind8 mph W
Humidity59%
Visibility—
Dew point63°
Sun, 2374° / 62°0
74 °
Darby, Sunday, 23 August
Partly cloudy. High 74°, low 62°.
Pressure30.00 inHg
Wind14.7 mph NW
Humidity30%
Visibility—
Dew point38°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2482° / 64°0.06
82 °
Darby, Monday, 24 August
Climate normal for this date — 60-year average.
Average high82°
Average low64°
Average precipitation0.06 in
Chance of precipitation18%
Record high92° (1968)
Record low53° (1971)
Tue, 2583° / 65°0.06
83 °
Darby, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high83°
Average low65°
Average precipitation0.06 in
Chance of precipitation15%
Record high95° (1968)
Record low53° (1987)
Wed, 2683° / 65°0.06
83 °
Darby, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high83°
Average low65°
Average precipitation0.06 in
Chance of precipitation25%
Record high92° (1975)
Record low55° (1977)
Thu, 2783° / 67°0.18
83 °
Darby, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high83°
Average low67°
Average precipitation0.18 in
Chance of precipitation33%
Record high92° (2020)
Record low56° (1963)
Fri, 2883° / 67°0.24
83 °
Darby, Friday, 28 August
Climate normal for this date — 60-year average.
Average high83°
Average low67°
Average precipitation0.24 in
Chance of precipitation47%
Record high97° (2024)
Record low56° (1986)
Sat, 2982° / 67°0.12
82 °
Darby, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high82°
Average low67°
Average precipitation0.12 in
Chance of precipitation30%
Record high93° (1973)
Record low49° (1986)
Sun, 3082° / 65°0.06
82 °
Darby, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.06 in
Chance of precipitation28%
Record high94° (1973)
Record low48° (1986)
Mon, 3182° / 65°0.07
82 °
Darby, Monday, 31 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.07 in
Chance of precipitation22%
Record high95° (2010)
Record low50° (1976)
Tue, 0180° / 64°0.13
80 °
Darby, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.13 in
Chance of precipitation30%
Record high93° (2010)
Record low55° (1967)
Wed, 0280° / 64°0.11
80 °
Darby, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.11 in
Chance of precipitation35%
Record high94° (1980)
Record low52° (1970)
Thu, 0381° / 64°0.15
81 °
Darby, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high81°
Average low64°
Average precipitation0.15 in
Chance of precipitation32%
Record high93° (2023)
Record low49° (1967)
Fri, 0481° / 65°0.09
81 °
Darby, Friday, 4 September
Climate normal for this date — 60-year average.
Average high81°
Average low65°
Average precipitation0.09 in
Chance of precipitation25%
Record high97° (2023)
Record low53° (2024)
Sat, 0580° / 64°0.08
80 °
Darby, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.08 in
Chance of precipitation25%
Record high97° (2023)
Record low53° (1997)
Sun, 0679° / 63°0.21
79 °
Darby, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high79°
Average low63°
Average precipitation0.21 in
Chance of precipitation33%
Record high96° (2023)
Record low52° (1984)
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 Darby, PA 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 Darby, PA 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.