Monthly outlook for Clarendon, PA: average high 76.8°, average low 55.8°. That is 0.9° above the climate normal for August. Precipitation is expected on 6 days (about 1.6 inches), against a normal of 7 days and 2.1 inches. The warmest day looks like 23 August (84.7°), the coolest 22 August (46°).
76.8°/55.8°
Average high / low
+0.9°
Above normal
6 / 7
Wet days / normal
1.6 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
76.9°
75.8°
+0.6°
18 August – 27 August
76.6°
74.6°
+1.1°
28 August – 6 September
at normal
73.6°
—
August records over 66 years
92.5°1 August 1975All-time high
41.5°29 August 1982All-time low
Climate normals and records are computed from the nearest reference point — Sheffield (8 mi).
Sun, 0984° / 65°0
84 °
Clarendon, Sunday, 9 August
Clear. High 84°, low 65°.
Pressure30.06 inHg
Wind1.9 mph W
Humidity52%
Visibility6.2 mi
Dew point61°
Mon, 1073° / 64°0.07
73 °
Clarendon, Monday, 10 August
Light rain. High 73°, low 64°.
Pressure30.00 inHg
Wind11.1 mph SW
Humidity83%
Visibility6.2 mi
Dew point65°
Tue, 1184° / 60°0.35
84 °
Clarendon, Tuesday, 11 August
Rain. High 84°, low 60°.
Pressure29.94 inHg
Wind5.8 mph SW
Humidity63%
Visibility6.2 mi
Dew point65°
Wed, 1280° / 62°0.19
80 °
Clarendon, Wednesday, 12 August
Light rain. High 80°, low 62°.
Pressure29.77 inHg
Wind6.9 mph W
Humidity71%
Visibility6.2 mi
Dew point63°
Thu, 1370° / 51°0.02
70 °
Clarendon, Thursday, 13 August
Light rain. High 70°, low 51°.
Pressure29.91 inHg
Wind12.9 mph NW
Humidity44%
Visibility—
Dew point45°
Fri, 1470° / 47°0.01
70 °
Clarendon, Friday, 14 August
Light rain. High 70°, low 47°.
Pressure30.06 inHg
Wind10.3 mph NW
Humidity47%
Visibility—
Dew point46°
Sat, 1572° / 49°0
72 °
Clarendon, Saturday, 15 August
Clear. High 72°, low 49°.
Pressure30.24 inHg
Wind9 mph N
Humidity41%
Visibility—
Dew point45°
Sun, 1676° / 50°0
76 °
Clarendon, Sunday, 16 August
Overcast. High 76°, low 50°.
Pressure30.18 inHg
Wind2.6 mph SE
Humidity38%
Visibility—
Dew point46°
Mon, 1779° / 54°0
79 °
Clarendon, Monday, 17 August
Overcast. High 79°, low 54°.
Pressure30.03 inHg
Wind5.3 mph NW
Humidity40%
Visibility—
Dew point50°
Tue, 1882° / 56°0
82 °
Clarendon, Tuesday, 18 August
Mostly clear. High 82°, low 56°.
Pressure30.00 inHg
Wind3.4 mph SE
Humidity35%
Visibility—
Dew point49°
Wed, 1981° / 60°0.45
81 °
Clarendon, Wednesday, 19 August
Rain. High 81°, low 60°.
Pressure29.80 inHg
Wind10.9 mph SW
Humidity49%
Visibility—
Dew point58°
Thu, 2068° / 55°0.1
68 °
Clarendon, Thursday, 20 August
Light rain. High 68°, low 55°.
Pressure29.77 inHg
Wind12.9 mph NW
Humidity96%
Visibility—
Dew point58°
Fri, 2170° / 48°0
70 °
Clarendon, Friday, 21 August
Clear. High 70°, low 48°.
Pressure29.97 inHg
Wind10.2 mph N
Humidity38%
Visibility—
Dew point41°
Sat, 2274° / 46°0
74 °
Clarendon, Saturday, 22 August
Overcast. High 74°, low 46°.
Pressure30.03 inHg
Wind5.1 mph S
Humidity32%
Visibility—
Dew point39°
Sun, 2385° / 61°0.04
85 °
Clarendon, Sunday, 23 August
Light rain. High 85°, low 61°.
Pressure29.88 inHg
Wind10.9 mph SW
Humidity69%
Visibility—
Dew point64°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2474° / 59°0.08
74 °
Clarendon, Monday, 24 August
Climate normal for this date — 60-year average.
Average high74°
Average low59°
Average precipitation0.08 in
Chance of precipitation37%
Record high87° (2008)
Record low46° (1971)
Tue, 2575° / 59°0.11
75 °
Clarendon, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high75°
Average low59°
Average precipitation0.11 in
Chance of precipitation33%
Record high84° (2021)
Record low46° (1987)
Wed, 2675° / 59°0.09
75 °
Clarendon, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high75°
Average low59°
Average precipitation0.09 in
Chance of precipitation33%
Record high87° (1993)
Record low47° (2017)
Thu, 2776° / 60°0.15
76 °
Clarendon, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.15 in
Chance of precipitation45%
Record high88° (1993)
Record low47° (1969)
Fri, 2875° / 60°0.17
75 °
Clarendon, Friday, 28 August
Climate normal for this date — 60-year average.
Average high75°
Average low60°
Average precipitation0.17 in
Chance of precipitation47%
Record high85° (1973)
Record low46° (1968)
Sat, 2974° / 59°0.15
74 °
Clarendon, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high74°
Average low59°
Average precipitation0.15 in
Chance of precipitation40%
Record high87° (1991)
Record low42° (1982)
Sun, 3074° / 58°0.12
74 °
Clarendon, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high74°
Average low58°
Average precipitation0.12 in
Chance of precipitation32%
Record high89° (1991)
Record low42° (1965)
Mon, 3174° / 58°0.14
74 °
Clarendon, Monday, 31 August
Climate normal for this date — 60-year average.
Average high74°
Average low58°
Average precipitation0.14 in
Chance of precipitation35%
Record high89° (1993)
Record low45° (2025)
Tue, 0173° / 57°0.09
73 °
Clarendon, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high73°
Average low57°
Average precipitation0.09 in
Chance of precipitation30%
Record high85° (1973)
Record low45° (1967)
Wed, 0274° / 58°0.19
74 °
Clarendon, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high74°
Average low58°
Average precipitation0.19 in
Chance of precipitation40%
Record high86° (2011)
Record low46° (1967)
Thu, 0373° / 57°0.12
73 °
Clarendon, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high73°
Average low57°
Average precipitation0.12 in
Chance of precipitation33%
Record high89° (2011)
Record low46° (2024)
Fri, 0473° / 58°0.11
73 °
Clarendon, Friday, 4 September
Climate normal for this date — 60-year average.
Average high73°
Average low58°
Average precipitation0.11 in
Chance of precipitation37%
Record high85° (2008)
Record low44° (1997)
Sat, 0573° / 57°0.11
73 °
Clarendon, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high73°
Average low57°
Average precipitation0.11 in
Chance of precipitation37%
Record high86° (2008)
Record low44° (1974)
Sun, 0673° / 57°0.1
73 °
Clarendon, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high73°
Average low57°
Average precipitation0.1 in
Chance of precipitation35%
Record high86° (2007)
Record low44° (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 Clarendon, 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 Clarendon, 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.