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Shaded-relief atlas plate of Derry, Pennsylvania: rivers, roads, the city limits and where the water drains.
PENNSYLVANIA · WESTMORELAND COUNTY

Derry

2,583 people, 1,180 ft above sea level in Westmoreland County.

1,180 ftElevation, city center
2,583People, 2024 estimate
1 sq miLand area
Sunny 68°
Sunny now Dew point 59° · Calm · high 71°
City of Derry River Interstate 2 miles
Explore the plate Order a print

The Derry plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.

MILE1
TODAY

Today in Derry

NWS forecast and National Blend of Models · updated 4:00 PM EDT
RIGHT NOW Arnold Palmer Regional Airport (KLBE) · 3:47 PM
Sunny
68° Sunny Feels like 68° · high of 71° near 4 PM
WindCalmno gusts
Humidity73%rising to 100% by morning
Pressure30.09 in →steady
Visibility10 mihaze-free
CloudsClear
UV index—no forecast
Dew point 59° · Comfortableabout the same for three days
DryComfortableStickyMuggyOppressive
NEXT RAIN
Mostly cloudy
Friday, about 3 PMin about 70 hours · 84% chance · rain
LIKELY AMOUNT0.2–0.6 inmost likely 0.4; 1 in 10 over 1
LAST RAINSept. 220.27 in · 7 dry days
ALERTS & OUTLOOKS
No watches or warnings for Westmoreland County
NWS Pittsburgh and the Storm Prediction Center · checked 4:55 PM
SUN & MOON
↑ 7:11 AM7:03 PM ↓
11 h 52 m of daylight, 3 minutes less than yesterday
Waning gibbous, 88% lit. The Harvest Moon was full Saturday.
AIR & POLLEN
29
GOODAir quality index · fine particles
Tomorrow: 48, good. No pollen source yet.

The next three days, hour by hour

Sky: clear, cloudy, night Rain likely National Blend of Models
TUESDAY, SEPT. 29
WEDNESDAY, SEPT. 30
THURSDAY, OCT. 1
FRIDAY, OCT. 2
4p
7p
10p
1a
4a
7a
10a
1p
4p
7p
10p
1a
4a
7a
10a
1p
4p
7p
10p
1a
4a
7a
10a
1p
partly cloudy day
mostly clear night
mostly clear night
mostly clear night
fog
fog
partly cloudy day
partly cloudy day
partly cloudy day
mostly cloudy night
mostly cloudy night
mostly cloudy night
partly cloudy night
mostly cloudy day
partly cloudy day
mostly sunny
partly cloudy day
partly cloudy night
partly cloudy night
partly cloudy night
partly cloudy night
mostly cloudy day
mostly cloudy day
mostly cloudy day
TEMPERATURE °F
71°
53°
76°
63°
79°
67°
CHANCE OF RAIN
84% · 0.02 in Friday afternoon 50%
WIND, MPH
0
0
0
0
0
0
0
8
7
6
5
3
5
8
13
14
13
12
9
9
13
14
16
16
HOW IT FEELS · DEW POINT
Comfortable: dew points 53 to 66°

The next seven days, and how sure we are

Forecast, with the range 8 in 10 ensemble members agree on Normal, about 80° / 62°
TUE Sept. 29 Partly cloudy Partly cloudy
71° 53°
0% rain — WSW 0 A
WED Sept. 30 Partly cloudy Partly cloudy
77° 63°
10% rain — SW 4 A
THU Oct. 1 Partly cloudy Partly cloudy
80° 67°
10% rain — SW 12 B
FRI Oct. 2 Showers likely Showers likely
77° 51°
80% rain 0.2–0.6″ NNW 14 C
SAT Oct. 3 Partly cloudy; cooler Partly cloudy; cooler
68° 51°
30% rain — E 8 B
SUN Oct. 4 Chance of showers Chance of showers
68° 47°
30% rain up to 0.4″ W 9 C
MON Oct. 5 Mostly sunny Mostly sunny
63° 40°
0% rain — NNW 13 C
How sure are we? AModels agree: highs within 4° BSome spread: within 8° CWide spread: check back
Range from the National Blend of Models percentiles · graded on Forecast Scores
AIR MAIL

Where today’s air came from

The air arriving over Derry about 5,000 feet above the ground was over the Atlantic off the Carolinas three days ago, and over the Great Lakes a day ago, about 1,610 miles back along its path. The nine paths traced from around the city fan out, so treat that as a best guess. Near the ground the air came from the western Atlantic; at 10,000 feet, from the Atlantic off the Carolinas. Traced back 72 hours through NOAA’s hourly RAP analyses and the GFS beyond them, nine paths at each of three heights.

MILE7
ON THE NETWORK

Around Derry on the Forecast Network

Neighboring plates

Hempfield PA · 15 MI 15 miles west Pittsburgh PA · 36 MI 36 miles west Cleveland OH · 147 MI 147 miles northwest Washington DC · 157 MI 157 miles southeast Baltimore MD · 160 MI 160 miles southeast Columbus OH · 196 MI 196 miles west
FORECASTCITY
Atlas plate of Derry, Pennsylvania. Explore the plate
PENNSYLVANIA · WESTMORELAND

Derry

2,583 people, 1,180 ft above sea level in Westmoreland County.

1,180 ftElevation
2,583People
1 sq miLand
Sunny 68°
SunnyDew point 59°
1

Today in Derry

NEXT 15 HOURS
Now partly cloudy day 71° 0%
7p mostly clear night 66° 0%
10p mostly clear night 59° 0%
1a mostly clear night 57° 0%
4a fog 55° 0%
7a fog 53° 0%
Mostly cloudy
NEXT RAINFriday about 3 PM · 84%
→
Tue0%
Partly cloudy Partly cloudy
53
71
A
Wed10%
Partly cloudy Partly cloudy
63
77
A
Thu10%
Partly cloudy Partly cloudy
67
80
B
Fri80%
Showers likely Showers likely
51
77
C
Sat30%
Partly cloudy; cooler Partly cloudy; cooler
51
68
B
Sun30%
Chance of showers Chance of showers
47
68
C
Mon0%
Mostly sunny Mostly sunny
40
63
C
Letters show how sure the forecast is: A, models agree; B, some spread; C, check back. Sample data.
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