As of 21:23 EDT

Weather in Chesterbrook, PA

77°

Chesterbrook, Saturday, 8 August, 21:23

Overcast. Feels like 78°. High 87°, low 71°.

Pressure29.97 inHg

Wind1 mph W

Humidity84%

Visibility6.2 mi

Dew point71°

See detailed hourly forecast

Monthly outlook for Chesterbrook, PA: average high 81.6°, average low 66.4°. That is 0.3° below the climate normal for August. Precipitation is expected on 5 days (about 1.8 inches), against a normal of 6 days and 2.1 inches. The warmest day looks like 9 August (88.6°), the coolest 22 August (58.1°).

81.6°/66.4°

Average high / low

−0.3°

Below normal

5 / 6

Wet days / normal

1.8 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
8 August – 17 August	84°	82.9°	+0.6°
18 August – 27 August	77.6°	81.3°	-2°
28 August – 6 September	at normal	80.2°	—

August records over 66 years

99°9 August 2001All-time high

46.9°30 August 1986All-time low

Climate normals and records are computed from the nearest reference point — Bryn Mawr (8 mi).

Sun, 0989° / 73°

89 °

Chesterbrook, Sunday, 9 August

Light rain. High 89°, low 73°.

Pressure30.00 inHg

Wind7.6 mph W

Humidity49%

Visibility6.2 mi

Dew point66°

Mon, 1088° / 73°

0.02

88 °

Chesterbrook, Monday, 10 August

Light rain. High 88°, low 73°.

Pressure30.00 inHg

Wind7.4 mph W

Humidity45%

Visibility6.2 mi

Dew point64°

Tue, 1188° / 72°

0.12

88 °

Chesterbrook, Tuesday, 11 August

Light rain. High 88°, low 72°.

Pressure29.88 inHg

Wind3.9 mph NW

Humidity59%

Visibility6.2 mi

Dew point70°

Wed, 1285° / 71°

0.03

85 °

Chesterbrook, Wednesday, 12 August

Light rain. High 85°, low 71°.

Pressure29.74 inHg

Wind11.6 mph W

Humidity65%

Visibility6.2 mi

Dew point68°

Thu, 1384° / 69°

84 °

Chesterbrook, Thursday, 13 August

Mostly clear. High 84°, low 69°.

Pressure29.80 inHg

Wind12.7 mph W

Humidity39%

Visibility—

Dew point55°

Fri, 1479° / 62°

79 °

Chesterbrook, Friday, 14 August

Mostly clear. High 79°, low 62°.

Pressure30.03 inHg

Wind8.5 mph W

Humidity33%

Visibility—

Dew point45°

Sat, 1581° / 62°

81 °

Chesterbrook, Saturday, 15 August

Clear. High 81°, low 62°.

Pressure30.12 inHg

Wind10.8 mph NW

Humidity36%

Visibility—

Dew point48°

Sun, 1680° / 61°

80 °

Chesterbrook, Sunday, 16 August

Overcast. High 80°, low 61°.

Pressure30.18 inHg

Wind4.9 mph NW

Humidity34%

Visibility—

Dew point47°

Mon, 1779° / 65°

0.15

79 °

Chesterbrook, Monday, 17 August

Rain. High 79°, low 65°.

Pressure30.09 inHg

Wind9.4 mph S

Humidity61%

Visibility—

Dew point60°

Tue, 1869° / 65°

0.22

69 °

Chesterbrook, Tuesday, 18 August

Light rain. High 69°, low 65°.

Pressure30.09 inHg

Wind8.4 mph SE

Humidity94%

Visibility—

Dew point65°

Wed, 1978° / 66°

0.03

78 °

Chesterbrook, Wednesday, 19 August

Light rain. High 78°, low 66°.

Pressure29.91 inHg

Wind11.1 mph S

Humidity65%

Visibility—

Dew point63°

Thu, 2078° / 68°

1.06

78 °

Chesterbrook, Thursday, 20 August

Rain. High 78°, low 68°.

Pressure29.68 inHg

Wind15.3 mph W

Humidity47%

Visibility—

Dew point55°

Fri, 2179° / 61°

79 °

Chesterbrook, Friday, 21 August

Clear. High 79°, low 61°.

Pressure29.85 inHg

Wind11.6 mph NW

Humidity37%

Visibility—

Dew point47°

Sat, 2278° / 58°

78 °

Chesterbrook, Saturday, 22 August

Mostly clear. High 78°, low 58°.

Pressure30.06 inHg

Wind6 mph W

Humidity35%

Visibility—

Dew point46°

Sun, 2384° / 64°

0.01

84 °

Chesterbrook, Sunday, 23 August

Light rain. High 84°, low 64°.

Pressure29.97 inHg

Wind12.1 mph S

Humidity59%

Visibility—

Dew point65°

From day 17 onward the outlook is built from 60-year climate statistics

Mon, 2481° / 64°

0.06

81 °

Chesterbrook, Monday, 24 August

Climate normal for this date — 60-year average.

Average high81°

Average low64°

Average precipitation0.06 in

Chance of precipitation18%

Record high92° (1968)

Record low53° (1971)

Tue, 2582° / 65°

0.06

82 °

Chesterbrook, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high82°

Average low65°

Average precipitation0.06 in

Chance of precipitation15%

Record high95° (1968)

Record low53° (1987)

Wed, 2682° / 65°

0.06

82 °

Chesterbrook, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high82°

Average low65°

Average precipitation0.06 in

Chance of precipitation23%

Record high91° (1993)

Record low54° (1977)

Thu, 2783° / 66°

0.18

83 °

Chesterbrook, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high83°

Average low66°

Average precipitation0.18 in

Chance of precipitation33%

Record high93° (2020)

Record low55° (1963)

Fri, 2882° / 67°

0.24

82 °

Chesterbrook, Friday, 28 August

Climate normal for this date — 60-year average.

Average high82°

Average low67°

Average precipitation0.24 in

Chance of precipitation47%

Record high96° (2024)

Record low56° (1968)

Sat, 2981° / 66°

0.11

81 °

Chesterbrook, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high81°

Average low66°

Average precipitation0.11 in

Chance of precipitation30%

Record high94° (2010)

Record low49° (1982)

Sun, 3081° / 65°

0.06

81 °

Chesterbrook, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high81°

Average low65°

Average precipitation0.06 in

Chance of precipitation27%

Record high94° (1973)

Record low47° (1986)

Mon, 3181° / 65°

0.07

81 °

Chesterbrook, Monday, 31 August

Climate normal for this date — 60-year average.

Average high81°

Average low65°

Average precipitation0.07 in

Chance of precipitation20%

Record high95° (2010)

Record low50° (1976)

Tue, 0180° / 64°

0.14

80 °

Chesterbrook, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high80°

Average low64°

Average precipitation0.14 in

Chance of precipitation32%

Record high94° (2010)

Record low54° (1967)

Wed, 0280° / 64°

0.11

80 °

Chesterbrook, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high80°

Average low64°

Average precipitation0.11 in

Chance of precipitation33%

Record high94° (1980)

Record low52° (1970)

Thu, 0380° / 64°

0.15

80 °

Chesterbrook, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high80°

Average low64°

Average precipitation0.15 in

Chance of precipitation28%

Record high92° (2023)

Record low49° (1967)

Fri, 0480° / 64°

0.09

80 °

Chesterbrook, Friday, 4 September

Climate normal for this date — 60-year average.

Average high80°

Average low64°

Average precipitation0.09 in

Chance of precipitation25%

Record high96° (2023)

Record low52° (1997)

Sat, 0579° / 64°

0.08

79 °

Chesterbrook, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high79°

Average low64°

Average precipitation0.08 in

Chance of precipitation25%

Record high96° (2023)

Record low52° (1997)

Sun, 0678° / 63°

0.21

78 °

Chesterbrook, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high78°

Average low63°

Average precipitation0.21 in

Chance of precipitation32%

Record high94° (2023)

Record low51° (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 Chesterbrook, 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 Chesterbrook, 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.