As of 17:15 EDT

Weather in Penn, PA

70°

Penn, Friday, 9 October, 17:15

Overcast. Feels like 69°. High 72°, low 45°.

Pressure30.18 inHg

Wind4.6 mph NW

Humidity40%

Visibility6.2 mi

Dew point46°

See detailed hourly forecast

Monthly outlook for Penn, PA: average high 65.9°, average low 46.7°. That is 1.2° above the climate normal for October. Precipitation is expected on 4 days (about 2.2 inches), against a normal of 4 days and 1.7 inches. The warmest day looks like 13 October (80.2°), the coolest 19 October (29.3°).

65.9°/46.7°

Average high / low

+1.2°

Above normal

4 / 4

Wet days / normal

2.2 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
9 October – 18 October	69.5°	64.8°	+2.6°
19 October – 28 October	59.8°	61°	-0.7°
29 October – 7 November	at normal	58°	—

October records over 66 years

88.5°2 October 2019All-time high

24.4°31 October 2011All-time low

Climate normals and records are computed from the nearest reference point — McSherrystown (3 mi).

Sat, 1071° / 47°

71 °

Penn, Saturday, 10 October

Overcast. High 71°, low 47°.

Pressure30.42 inHg

Wind6 mph E

Humidity48%

Visibility6.2 mi

Dew point48°

Sun, 1168° / 51°

1.71

68 °

Penn, Sunday, 11 October

Heavy rain. High 68°, low 51°.

Pressure30.09 inHg

Wind9.7 mph E

Humidity96%

Visibility2.9 mi

Dew point62°

Mon, 1274° / 62°

0.24

74 °

Penn, Monday, 12 October

Rain. High 74°, low 62°.

Pressure29.83 inHg

Wind13.7 mph NW

Humidity72%

Visibility6.2 mi

Dew point60°

Tue, 1380° / 58°

80 °

Penn, Tuesday, 13 October

Overcast. High 80°, low 58°.

Pressure29.85 inHg

Wind8.7 mph SW

Humidity67%

Visibility6.2 mi

Dew point64°

Wed, 1480° / 68°

80 °

Penn, Wednesday, 14 October

Partly cloudy. High 80°, low 68°.

Pressure29.91 inHg

Wind8.4 mph N

Humidity73%

Visibility—

Dew point66°

Thu, 1565° / 53°

65 °

Penn, Thursday, 15 October

Clear. High 65°, low 53°.

Pressure30.27 inHg

Wind12 mph SE

Humidity51%

Visibility—

Dew point43°

Fri, 1672° / 56°

0.04

72 °

Penn, Friday, 16 October

Light rain. High 72°, low 56°.

Pressure30.06 inHg

Wind18.6 mph S

Humidity62%

Visibility—

Dew point50°

Sat, 1763° / 41°

0.16

63 °

Penn, Saturday, 17 October

Rain. High 63°, low 41°.

Pressure29.97 inHg

Wind17 mph W

Humidity50%

Visibility—

Dew point37°

Sun, 1850° / 34°

50 °

Penn, Sunday, 18 October

Partly cloudy. High 50°, low 34°.

Pressure30.33 inHg

Wind17.6 mph N

Humidity50%

Visibility—

Dew point28°

Mon, 1950° / 29°

50 °

Penn, Monday, 19 October

Mostly clear. High 50°, low 29°.

Pressure30.56 inHg

Wind7.5 mph N

Humidity43%

Visibility—

Dew point21°

Tue, 2055° / 37°

55 °

Penn, Tuesday, 20 October

Overcast. High 55°, low 37°.

Pressure30.53 inHg

Wind4.6 mph E

Humidity42%

Visibility—

Dew point25°

Wed, 2159° / 36°

59 °

Penn, Wednesday, 21 October

Clear. High 59°, low 36°.

Pressure30.47 inHg

Wind4.5 mph N

Humidity47%

Visibility—

Dew point30°

Thu, 2261° / 39°

61 °

Penn, Thursday, 22 October

Clear. High 61°, low 39°.

Pressure30.27 inHg

Wind8.7 mph SW

Humidity52%

Visibility—

Dew point35°

Fri, 2367° / 44°

67 °

Penn, Friday, 23 October

Clear. High 67°, low 44°.

Pressure30.09 inHg

Wind10.1 mph W

Humidity54%

Visibility—

Dew point42°

Sat, 2467° / 47°

67 °

Penn, Saturday, 24 October

Clear. High 67°, low 47°.

Pressure30.18 inHg

Wind5.8 mph W

Humidity62%

Visibility—

Dew point46°

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

Sun, 2560° / 46°

0.14

60 °

Penn, Sunday, 25 October

Climate normal for this date — 60-year average.

Average high60°

Average low46°

Average precipitation0.14 in

Chance of precipitation30%

Record high76° (2021)

Record low33° (1962)

Mon, 2660° / 46°

0.12

60 °

Penn, Monday, 26 October

Climate normal for this date — 60-year average.

Average high60°

Average low46°

Average precipitation0.12 in

Chance of precipitation32%

Record high78° (2023)

Record low32° (1962)

Tue, 2760° / 46°

0.18

60 °

Penn, Tuesday, 27 October

Climate normal for this date — 60-year average.

Average high60°

Average low46°

Average precipitation0.18 in

Chance of precipitation30%

Record high80° (1963)

Record low31° (1976)

Wed, 2860° / 45°

0.11

60 °

Penn, Wednesday, 28 October

Climate normal for this date — 60-year average.

Average high60°

Average low45°

Average precipitation0.11 in

Chance of precipitation27%

Record high80° (1984)

Record low28° (1976)

Thu, 2958° / 43°

0.22

58 °

Penn, Thursday, 29 October

Climate normal for this date — 60-year average.

Average high58°

Average low43°

Average precipitation0.22 in

Chance of precipitation23%

Record high74° (1984)

Record low29° (1965)

Fri, 3058° / 42°

0.11

58 °

Penn, Friday, 30 October

Climate normal for this date — 60-year average.

Average high58°

Average low42°

Average precipitation0.11 in

Chance of precipitation25%

Record high78° (2016)

Record low28° (2011)

Sat, 3159° / 44°

0.06

59 °

Penn, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high59°

Average low44°

Average precipitation0.06 in

Chance of precipitation22%

Record high78° (2024)

Record low24° (2011)

Sun, 0160° / 46°

0.06

60 °

Penn, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high60°

Average low46°

Average precipitation0.06 in

Chance of precipitation23%

Record high78° (1974)

Record low34° (2002)

Mon, 0260° / 45°

0.14

60 °

Penn, Monday, 2 November

Climate normal for this date — 60-year average.

Average high60°

Average low45°

Average precipitation0.14 in

Chance of precipitation37%

Record high78° (1971)

Record low31° (1976)

Tue, 0359° / 44°

0.07

59 °

Penn, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high59°

Average low44°

Average precipitation0.07 in

Chance of precipitation27%

Record high77° (2003)

Record low31° (1996)

Wed, 0457° / 42°

0.09

57 °

Penn, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high57°

Average low42°

Average precipitation0.09 in

Chance of precipitation22%

Record high76° (2003)

Record low28° (1962)

Thu, 0557° / 43°

0.11

57 °

Penn, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high57°

Average low43°

Average precipitation0.11 in

Chance of precipitation33%

Record high76° (1961)

Record low26° (1991)

Fri, 0656° / 42°

0.06

56 °

Penn, Friday, 6 November

Climate normal for this date — 60-year average.

Average high56°

Average low42°

Average precipitation0.06 in

Chance of precipitation30%

Record high80° (2024)

Record low27° (1967)

Sat, 0755° / 41°

0.07

55 °

Penn, Saturday, 7 November

Climate normal for this date — 60-year average.

Average high55°

Average low41°

Average precipitation0.07 in

Chance of precipitation22%

Record high72° (2023)

Record low27° (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 Penn, 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 Penn, 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.