Observed 2:30 AM EDT at KJST

Derry, PA weather

Clear and 43°6°.

Forecasts agree

Now 43°6°

Clear · Feels like 39°4°

Wind: 6 mph9 km/h; From the southeast. Up to 6 mph10 km/h through 2 PM
Dew point: 36°2°; Comfortable
UV index: 0Low; Moderate 11 AM–5 PM · peak 4
Air quality: 49Good; Main pollutant: PM2.5 (fine particles)
Pressure: 30.42 inHg1030 hPa; Steady over the last 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

7°4° warmer than this time yesterday (41°5° then, 48°9° now)

Good hours for

Low 38°3° today at 8 AM
Above 50°10° today by 11 AM
High 63°17° today at 2 PM
Below 50°10° tonight after 8 PM

TonightDown to 40°4° by 5 AM · Clear
This morningUp to 53°12° by 11 AM · Clear
This afternoonUp to 63°17° by 2 PM · Clear
TonightDown to 38°3° by 5 AM · Clear
Tomorrow morningUp to 54°12° by 11 AM · Clear
Tomorrow afternoonUp to 65°18° by 4 PM · Clear
Tomorrow nightDown to 42°6° by 1 AM · Clear

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 2a	Clear	48°9° (likely 42°6° to 48°9°)	46°8°	0%	6 mph10 km/h from SE, gusts 11 mph17 km/h	70%	0%	0
Sat 3a	Clear	42°6° (likely 41°5° to 47°8°)	39°4°	0%	5 mph8 km/h from SE, gusts 13 mph21 km/h	86%	1%	0
Sat 4a	Clear	41°5° (likely 40°4° to 47°8°)	38°3°	0%	5 mph8 km/h from SE, gusts 13 mph20 km/h	88%	5%	0
Sat 5a	Clear	40°4° (likely 40°4° to 46°8°)	37°3°	0%	5 mph8 km/h from SE, gusts 11 mph18 km/h	88%	7%	0
Sat 6a	Clear	39°4° (likely 39°4° to 46°8°)	36°2°	0%	5 mph8 km/h from SE, gusts 11 mph18 km/h	89%	8%	0
Sat 7a	Clear	39°4° (likely 38°3° to 45°7°)	35°2°	0%	5 mph8 km/h from SE, gusts 10 mph17 km/h	90%	9%	0
Sat 8a	Sunny	38°3° (likely 38°3° to 45°7°)	35°2°	0%	5 mph8 km/h from SE, gusts 10 mph16 km/h	91%	9%	0
Sat 9a	Sunny	42°6° (likely 42°6° to 48°9°)	39°4°	0%	5 mph8 km/h from SE, gusts 11 mph17 km/h	87%	0%	0
Sat 10a	Sunny	48°9° (likely 48°9° to 52°11°)	45°7°	0%	5 mph8 km/h from SE, gusts 15 mph25 km/h	77%	0%	1
Sat 11a	Sunny	53°12° (likely 53°12° to 56°13°)	53°12°	0%	6 mph10 km/h from SE, gusts 16 mph25 km/h	66%	0%	3
Sat 12p	Sunny	59°15° (likely 57°14° to 59°15°)	59°15°	0%	5 mph8 km/h from SE, gusts 12 mph20 km/h	51%	0%	3
Sat 1p	Sunny	62°17° (likely 59°15° to 62°17°)	62°17°	0%	3 mph5 km/h from SE, gusts 10 mph16 km/h	46%	2%	4
Sat 2p	Sunny	63°17° (likely 60°16° to 63°17°)	63°17°	0%	2 mph3 km/h from SE, gusts 8 mph14 km/h	43%	5%	4
Sat 3p	Sunny	63°17° (likely 61°16° to 63°17°)	63°17°	0%	2 mph3 km/h from SE, gusts 8 mph14 km/h	43%	7%	4
Sat 4p	Sunny	63°17° (likely 60°16° to 63°17°)	63°17°	0%	3 mph5 km/h from SE, gusts 9 mph14 km/h	41%	9%	3
Sat 5p	Sunny	62°17° (likely 59°15° to 62°17°)	63°17°	0%	5 mph8 km/h from SE, gusts 10 mph16 km/h	41%	4%	1
Sat 6p	Clear	60°16° (likely 55°13° to 60°16°)	60°16°	0%	6 mph10 km/h from SE, gusts 11 mph18 km/h	45%	1%	1
Sat 7p	Clear	55°13° (likely 52°11° to 55°13°)	55°13°	0%	7 mph11 km/h from SE, gusts 11 mph18 km/h	52%	0%	0
Sat 8p	Clear	49°9° (likely 49°9° to 50°10°)	46°8°	0%	8 mph13 km/h from SE, gusts 15 mph24 km/h	65%	0%	0
Sat 9p	Clear	47°8° (likely 47°8° to 50°10°)	44°7°	0%	7 mph11 km/h from SE, gusts 14 mph22 km/h	71%	0%	0
Sat 10p	Clear	45°7° (likely 45°7° to 49°9°)	42°6°	0%	6 mph10 km/h from SE, gusts 14 mph22 km/h	73%	0%	0
Sat 11p	Clear	44°7° (likely 44°7° to 49°9°)	41°5°	0%	6 mph10 km/h from SE, gusts 14 mph22 km/h	74%	0%	0
Sun 12a	Clear	43°6° (likely 43°6° to 49°9°)	40°4°	0%	6 mph10 km/h from SE, gusts 14 mph23 km/h	75%	0%	0
Sun 1a	Clear	42°6° (likely 42°6° to 48°9°)	40°4°	0%	5 mph8 km/h from SE, gusts 14 mph23 km/h	73%	0%	0
Sun 2a	Clear	42°6° (likely 41°5° to 48°9°)	39°4°	0%	5 mph8 km/h from SE, gusts 15 mph24 km/h	76%	0%	0
Sun 3a	Clear	41°5° (likely 40°4° to 48°9°)	38°3°	0%	5 mph8 km/h from SE, gusts 14 mph22 km/h	83%	0%	0
Sun 4a	Clear	40°4° (likely 38°3° to 47°8°)	37°3°	0%	3 mph5 km/h from SE, gusts 13 mph20 km/h	84%	0%	0
Sun 5a	Clear	38°3° (likely 37°3° to 47°8°)	36°2°	0%	3 mph5 km/h from SE, gusts 12 mph19 km/h	87%	7%	0
Sun 6a	Clear	37°3° (likely 35°2° to 47°8°)	37°3°	0%	2 mph3 km/h from SE, gusts 10 mph16 km/h	88%	9%	0
Sun 7a	Clear	36°2° (likely 34°1° to 45°7°)	37°3°	0%	2 mph3 km/h from SE, gusts 7 mph11 km/h	89%	10%	0
Sun 8a	Sunny	36°2° (likely 34°1° to 44°7°)	36°2°	0%	2 mph3 km/h from SE, gusts 8 mph12 km/h	92%	10%	0
Sun 9a	Sunny	40°4° (likely 40°4° to 48°9°)	40°4°	0%	2 mph3 km/h from SE, gusts 7 mph11 km/h	93%	2%	0
Sun 10a	Sunny	48°9° (likely 48°9° to 52°11°)	48°9°	0%	1 mph2 km/h from SE, gusts 7 mph11 km/h	78%	0%	1
Sun 11a	Sunny	54°12° (likely 54°12° to 57°14°)	54°12°	0%	1 mph2 km/h from SE, gusts 6 mph10 km/h	66%	1%	3
Sun 12p	Sunny	59°15° (likely 58°14° to 60°16°)	59°15°	0%	1 mph2 km/h from SE, gusts 4 mph7 km/h	54%	3%	3
Sun 1p	Sunny	63°17° (likely 60°16° to 63°17°)	63°17°	0%	0 mph0 km/h, gusts 4 mph6 km/h	46%	5%	4
Sun 2p	Sunny	64°18° (likely 60°16° to 64°18°)	64°18°	0%	0 mph0 km/h, gusts 4 mph7 km/h	44%	5%	4
Sun 3p	Sunny	64°18° (likely 61°16° to 64°18°)	65°18°	0%	0 mph0 km/h, gusts 4 mph6 km/h	44%	3%	4
Sun 4p	Sunny	65°18° (likely 62°17° to 65°18°)	65°18°	0%	0 mph0 km/h, gusts 4 mph6 km/h	44%	1%	3
Sun 5p	Sunny	64°18° (likely 61°16° to 64°18°)	64°18°	0%	0 mph0 km/h, gusts 3 mph6 km/h	45%	0%	1
Sun 6p	Clear	61°16° (likely 56°13° to 61°16°)	61°16°	0%	0 mph0 km/h, gusts 5 mph8 km/h	50%	2%	1
Sun 7p	Clear	57°14° (likely 52°11° to 57°14°)	57°14°	0%	0 mph0 km/h, gusts 3 mph5 km/h	60%	28%	0
Sun 8p	Clear	50°10° (likely 50°10° to 52°11°)	50°10°	0%	0 mph0 km/h, gusts 3 mph5 km/h	74%	26%	0
Sun 9p	Clear	48°9° (likely 48°9° to 49°9°)	48°9°	0%	0 mph0 km/h, gusts 4 mph6 km/h	83%	3%	0
Sun 10p	Clear	46°8° (likely 41°5° to 47°8°)	46°8°	0%	0 mph0 km/h, gusts 4 mph7 km/h	88%	2%	0
Sun 11p	Clear	44°7° (likely 38°3° to 46°8°)	44°7°	0%	1 mph2 km/h from SE, gusts 4 mph7 km/h	90%	15%	0
Mon 12a	Clear	43°6° (likely 36°2° to 45°7°)	43°6°	0%	1 mph2 km/h from SE, gusts 4 mph7 km/h	90%	16%	0
Mon 1a	Clear	42°6° (likely 35°2° to 45°7°)	42°6°	0%	1 mph2 km/h from SE, gusts 4 mph7 km/h	88%	18%	0

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 24. Sunny. High 64°18°, low 38°3°. Typical 60°16° / 38°3°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 38°3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 49°9°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 38°3°
  Dry
Official NWS forecast
Today: Sunny, with a high near 64. Southeast wind 2 to 6 mph.
Tonight: Clear, with a low around 38. Southeast wind around 6 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
61°16°–64°18°
Low, likely
38°3°–45°7°
Typical high / low
60°16° / 38°3°
Wind
16 mph26 km/h, gusts 22 mph35 km/h
UV peak
4
Tomorrow, Oct 25. Fog. High 65°18°, low 39°4°. Typical 59°15° / 38°3°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 50°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 40°5°
  Dry
Official NWS forecast
Day: Areas of frost before 9am, then patchy fog between 9am and 10am. Sunny, with a high near 65. Southeast wind around 2 mph.
Night: Clear, with a low around 39. Southeast wind around 1 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
62°17°–65°18°
Low, likely
33°1°–43°6°
Typical high / low
59°15° / 38°3°
Wind
17 mph27 km/h, gusts 22 mph36 km/h
UV peak
4
Monday, Oct 26. Fog. High 66°19°, low 43°6°. Typical 59°15° / 37°3°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 46°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy fog between 7am and 9am. Sunny, with a high near 66.
Night: Partly cloudy, with a low around 43.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
63°17°–66°19°
Low, likely
36°2°–43°6°
Typical high / low
59°15° / 37°3°
Wind
6 mph10 km/h, gusts 17 mph27 km/h
UV peak
4
Tuesday, Oct 27. Partly sunny. High 65°18°, low 44°7°. Typical 58°14° / 37°3°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 46°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 65.
Night: Partly cloudy, with a low around 44.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–66°19°
Low, likely
42°6°–47°8°
Typical high / low
58°14° / 37°3°
Wind
7 mph11 km/h, gusts 12 mph20 km/h
UV peak
4
Wednesday, Oct 28. Mostly cloudy. High 66°19°, low 45°7°. Typical 58°14° / 37°3°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly cloudy, with a high near 66.
Night: Mostly cloudy, with a low around 45.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
61°16°–68°20°
Low, likely
44°7°–48°9°
Typical high / low
58°14° / 37°3°
Wind
9 mph15 km/h, gusts 18 mph29 km/h
UV peak
3
Thursday, Oct 29. Mostly sunny. High 70°21°, low 48°9°. Typical 58°14° / 36°2°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 48°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 70.
Night: Mostly clear, with a low around 48.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
67°19°–70°21°
Low, likely
41°5°–49°9°
Typical high / low
58°14° / 36°2°
Wind
10 mph17 km/h, gusts 28 mph44 km/h
UV peak
4
Friday, Oct 30. Partly sunny. High 67°19°, low 46°8°. Typical 57°14° / 36°2°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 43°6°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 67.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
62°17°–71°22°
Low, likely
44°7°–48°9°
Typical high / low
57°14° / 36°2°
Wind
8 mph13 km/h, gusts 22 mph35 km/h
UV peak
3
Saturday, Oct 31. Cloudy. High 70°21°, low 46°8°. Typical 57°14° / 36°2°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 42°6°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 69°21°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 50°10°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
68°20°–73°23°
Low, likely
37°3°–52°11°
Typical high / low
57°14° / 36°2°
Wind
9 mph14 km/h
UV peak
3
Sunday, Nov 1. Drizzle. High 69°21°, low 51°11°. Typical 56°13° / 36°2°. Rain 0.06 in1.5 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 50°10°
  30% chance
2. Afternoon
  noon–6 PM
  Drizzle, 69°20°
  30% chance
3. Evening
  6 PM–midnight
  Drizzle, 61°16°
  30% chance · 0.03 in0.8 mm
4. Overnight
  midnight–6 AM
  Drizzle, 58°15°
  40% chance · 0.04 in1 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
59°15°–74°23°
Low, likely
44°7°–57°14°
Typical high / low
56°13° / 36°2°
Wind
11 mph17 km/h, gusts 27 mph44 km/h
Monday, Nov 2. Drizzle. High 61°16°, low 54°12°. Typical 56°13° / 35°2°. Rain 0.47 in12 mm, 40% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 59°15°
  40% chance · 0.18 in4.5 mm
2. Afternoon
  noon–6 PM
  Drizzle, 64°18°
  40% chance · 0.1 in2.5 mm
3. Evening
  6 PM–midnight
  Drizzle, 55°13°
  30% chance · 0.02 in0.5 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
57°14°–65°18°
Low, likely
52°11°–55°13°
Typical high / low
56°13° / 35°2°
Wind
14 mph22 km/h, gusts 38 mph62 km/h

10 days15 days30 days

The outlook

Today
Dry, high 64°, low 38°.
Tomorrow
Dry, high 65°, low 39°.
Monday
Dry, high 66°, low 43°.
Rest of week
Highs 61–70°; chance of precipitation on Monday.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (PBZ) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue

Radar loads when scrolled into view

Full-screen radar

Rivers

NOAA river gauges within 25 mi

Loyalhanna Creek at Loyalhanna Dam Pool

12 mi

Below flood stage

Level: 924 ft

Forecast peak 924 ft Sat 3 PM

Reading from Sat 1:15 AM · NWS gauge page

Conemaugh River at Seward

16 mi

Below flood stage

Level: 2.6 ft
Flow: 724 cfs

Forecast peak 2.6 ft Sat 8 AM

Reading from Sat 1:45 AM · NWS gauge page

Loyalhanna Creek at Kingston

3.5 mi

Below flood stage

Level: 2.6 ft
Flow: 155 cfs

Reading from Sat 1:45 AM · NWS gauge page

Loyalhanna Creek at Latrobe

4.9 mi

Below flood stage

Level: 6.3 ft

Reading from Sat 1:45 AM · NWS gauge page

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Heating this week

About 75% less heating than a typical week.

This week 31Typical 121

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 24
h below 17°F: 0
h below 5°F: 0

47, 17 and 5°F are the test points heat pumps are rated at. About 15 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 36°F).

Open the windows?

Today, 1:00 PM–6:00 PM

Good stretch to open the windows.

Is this typical?

Donegal 2 NW · official normals 1991–2020 · records 1943–2026

Oct 24, today vs a typical year

Today’s expected high is 4°2° warmer than typical.

Last 7 days vs normal

On average 0° colder than normal (daily mean temperature).

−3°−2°SunOct 18
+1°±0°MonOct 19
±0°TueOct 20
+2°+1°WedOct 21
−2°−1°ThuOct 22
+2°+1°FriOct 23
—SatOct 24

Derry weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 46 min; Losing 2 min 30 s a day; shortest Dec 21, 1 h 29 min less
Golden hour: 5:46–6:41 PM; Morning 7:20–8:15 AM
Blue hour: 6:41–6:52 PM; Morning 7:10–7:20 AM; first light 7:10 AM

Stars tonight? Good

Clear 2:47–7:10 AM; moon 96% lit, sets 5:50 AM.

Moon

Waxing gibbous

95% lit · growing

Today: sets 5:50 AM · rises 5:21 PM
Full moon: Oct 26
New moon: Nov 9

Looking southeast from Derry. The highest point on the skyline is about 2,400 ft, 2 mi away.Skyline from USGS elevation data, heights drawn up to 3.5× taller. Sky, sun and moon as they are now.

Derry, PA weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Loyalhanna Creek at Loyalhanna Dam Pool

Conemaugh River at Seward

Loyalhanna Creek at Kingston

Loyalhanna Creek at Latrobe

For your home

Heating this week

Heat-pump hours, next 7 days

Comfort

Open the windows?

Is this typical?

Oct 24, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Good

Moon