Observed 7:20 PM EDT at KAFJ

Jefferson, PA weather

Clear and 52°11°.

Mostly agree

Now 52°11°

Clear

Wind: Calm; Light through 7 AM
Dew point: 45°7°; Comfortable
UV tomorrow: 4Moderate; Moderate 11 AM–5 PM · peak 4
Air quality: 44Good; Main pollutant: Ozone
Pressure: 30.37 inHg1028 hPa; Rising slowly · +0.03 inHg+1.1 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Below 50°10° tonight after 9 PM
Low 37°3° tomorrow at 8 AM
Above 50°10° tomorrow by 11 AM
High 65°18° tomorrow at 3 PM

TonightDown to 38°3° by 5 AM · Clear
Tomorrow morningUp to 54°12° by 11 AM · Clear
Tomorrow afternoonUp to 65°18° by 3 PM · Clear
Tomorrow nightDown to 38°3° by 5 AM · Clear
Sunday morningUp to 54°12° by 11 AM · Clear
Sunday afternoonUp to 67°19° by 3 PM · Clear

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Fri 7p	Clear	56°13° (likely 52°11° to 57°14°)	56°13°	0%	3 mph5 km/h from NE, gusts 7 mph11 km/h	62%	6%	0
Fri 8p	Clear	52°11° (likely 50°10° to 53°12°)	52°11°	0%	2 mph3 km/h from NE, gusts 6 mph10 km/h	73%	1%	0
Fri 9p	Clear	48°9° (likely 48°9° to 51°11°)	47°8°	0%	2 mph3 km/h from NE, gusts 5 mph8 km/h	85%	0%	0
Fri 10p	Clear	46°8° (likely 46°8° to 50°10°)	46°8°	0%	1 mph2 km/h from E, gusts 5 mph8 km/h	90%	0%	0
Fri 11p	Clear	44°7° (likely 44°7° to 48°9°)	44°7°	0%	1 mph2 km/h from E, gusts 4 mph6 km/h	95%	0%	0
Sat 12a	Clear	43°6° (likely 43°6° to 47°8°)	43°6°	0%	1 mph2 km/h from E, gusts 4 mph6 km/h	98%	0%	0
Sat 1a	Clear	42°6° (likely 42°6° to 46°8°)	42°6°	0%	0 mph0 km/h, gusts 4 mph7 km/h	100%	0%	0
Sat 2a	Clear	41°5° (likely 41°5° to 45°7°)	41°5°	0%	1 mph2 km/h from E, gusts 5 mph8 km/h	100%	0%	0
Sat 3a	Clear	40°4° (likely 40°4° to 45°7°)	41°5°	0%	1 mph2 km/h from E, gusts 4 mph6 km/h	100%	0%	0
Sat 4a	Clear	40°4° (likely 40°4° to 44°7°)	40°4°	0%	0 mph0 km/h, gusts 2 mph3 km/h	100%	0%	0
Sat 5a	Clear	38°3° (likely 38°3° to 44°7°)	39°4°	0%	0 mph0 km/h, gusts 2 mph3 km/h	100%	0%	0
Sat 6a	Clear	38°3° (likely 38°3° to 43°6°)	38°3°	0%	0 mph0 km/h, gusts 2 mph3 km/h	100%	5%	0
Sat 7a	Clear	38°3° (likely 38°3° to 42°6°)	38°3°	0%	0 mph0 km/h, gusts 2 mph4 km/h	100%	11%	0
Sat 8a	Sunny	37°3° (likely 37°3° to 42°6°)	37°3°	0%	0 mph0 km/h, gusts 2 mph3 km/h	99%	12%	0
Sat 9a	Sunny	40°4° (likely 40°4° to 45°7°)	40°4°	0%	0 mph0 km/h, gusts 2 mph3 km/h	100%	13%	0
Sat 10a	Sunny	47°8° (likely 47°8° to 52°11°)	47°8°	0%	0 mph0 km/h, gusts 6 mph9 km/h	93%	8%	1
Sat 11a	Sunny	54°12° (likely 54°12° to 58°14°)	54°12°	0%	1 mph2 km/h from SE, gusts 5 mph8 km/h	75%	11%	3
Sat 12p	Sunny	59°15° (likely 58°14° to 61°16°)	59°15°	0%	1 mph2 km/h from SE, gusts 5 mph7 km/h	64%	16%	4
Sat 1p	Sunny	63°17° (likely 61°16° to 63°17°)	63°17°	0%	0 mph0 km/h, gusts 3 mph5 km/h	55%	16%	4
Sat 2p	Sunny	64°18° (likely 62°17° to 65°18°)	64°18°	0%	1 mph2 km/h from E, gusts 3 mph5 km/h	51%	13%	4
Sat 3p	Sunny	65°18° (likely 63°17° to 66°19°)	65°18°	0%	1 mph2 km/h from E, gusts 5 mph7 km/h	51%	12%	4
Sat 4p	Sunny	65°18° (likely 63°17° to 65°18°)	65°18°	0%	2 mph3 km/h from NE, gusts 6 mph9 km/h	48%	11%	3
Sat 5p	Sunny	64°18° (likely 62°17° to 64°18°)	64°18°	0%	2 mph3 km/h from E, gusts 6 mph9 km/h	50%	3%	2
Sat 6p	Clear	62°17° (likely 58°14° to 62°17°)	62°17°	0%	3 mph5 km/h from NE, gusts 6 mph10 km/h	53%	8%	1
Sat 7p	Clear	58°14° (likely 54°12° to 58°14°)	58°14°	0%	3 mph5 km/h from E, gusts 7 mph11 km/h	61%	6%	0
Sat 8p	Clear	52°11° (likely 51°11° to 53°12°)	52°11°	0%	3 mph5 km/h from E, gusts 8 mph13 km/h	76%	6%	0
Sat 9p	Clear	49°9° (likely 49°9° to 50°10°)	48°9°	0%	3 mph5 km/h from SE, gusts 9 mph14 km/h	83%	0%	0
Sat 10p	Clear	47°8° (likely 47°8° to 49°9°)	47°8°	0%	2 mph3 km/h from E, gusts 9 mph14 km/h	86%	0%	0
Sat 11p	Clear	45°7° (likely 45°7° to 48°9°)	45°7°	0%	2 mph3 km/h from E, gusts 9 mph14 km/h	90%	0%	0
Sun 12a	Clear	43°6° (likely 43°6° to 46°8°)	43°6°	0%	1 mph2 km/h from E, gusts 7 mph11 km/h	94%	0%	0
Sun 1a	Clear	42°6° (likely 42°6° to 45°7°)	42°6°	0%	0 mph0 km/h, gusts 6 mph10 km/h	96%	0%	0
Sun 2a	Clear	41°5° (likely 41°5° to 44°7°)	41°5°	0%	0 mph0 km/h, gusts 4 mph7 km/h	98%	0%	0
Sun 3a	Clear	40°4° (likely 40°4° to 43°6°)	40°4°	0%	0 mph0 km/h, gusts 3 mph4 km/h	98%	0%	0
Sun 4a	Clear	39°4° (likely 39°4° to 42°6°)	39°4°	0%	0 mph0 km/h, gusts 2 mph3 km/h	100%	0%	0
Sun 5a	Clear	38°3° (likely 38°3° to 41°5°)	38°3°	0%	0 mph0 km/h, gusts 2 mph4 km/h	100%	0%	0
Sun 6a	Clear	37°3° (likely 37°3° to 41°5°)	37°3°	0%	0 mph0 km/h, gusts 2 mph3 km/h	100%	0%	0
Sun 7a	Clear	37°3° (likely 37°3° to 40°4°)	37°3°	0%	0 mph0 km/h, gusts 2 mph3 km/h	100%	0%	0
Sun 8a	Sunny	36°2° (likely 36°2° to 40°4°)	37°3°	0%	0 mph0 km/h, gusts 2 mph3 km/h	99%	0%	0
Sun 9a	Sunny	40°4° (likely 39°4° to 43°6°)	40°4°	0%	0 mph0 km/h, gusts 3 mph4 km/h	100%	0%	0
Sun 10a	Sunny	46°8° (likely 46°8° to 52°11°)	46°8°	0%	0 mph0 km/h, gusts 6 mph9 km/h	90%	2%	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	72%	1%	3
Sun 12p	Sunny	60°16° (likely 57°14° to 60°16°)	60°16°	0%	1 mph2 km/h from SE, gusts 5 mph9 km/h	61%	1%	4
Sun 1p	Sunny	63°17° (likely 60°16° to 63°17°)	63°17°	0%	0 mph0 km/h, gusts 4 mph6 km/h	53%	1%	4
Sun 2p	Sunny	65°18° (likely 62°17° to 65°18°)	65°18°	0%	0 mph0 km/h, gusts 3 mph5 km/h	48%	1%	4
Sun 3p	Sunny	67°19° (likely 63°17° to 67°19°)	67°19°	0%	0 mph0 km/h, gusts 3 mph4 km/h	45%	0%	4
Sun 4p	Sunny	67°19° (likely 63°17° to 67°19°)	67°19°	0%	0 mph0 km/h, gusts 3 mph5 km/h	45%	0%	3
Sun 5p	Sunny	65°18° (likely 62°17° to 65°18°)	65°18°	0%	0 mph0 km/h, gusts 3 mph4 km/h	47%	0%	2
Sun 6p	Clear	62°17° (likely 58°14° to 62°17°)	62°17°	0%	0 mph0 km/h, gusts 2 mph4 km/h	54%	1%	1

Days ahead

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

Today, Oct 23. Fog. High 63°17°, low 37°3°. Typical 62°17° / 37°3°. Dry. Mostly agree.
1. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
2. Overnight
  midnight–6 AM
  Clear, 38°3°
  Dry
Official NWS forecast
Tonight: Patchy fog after midnight. Clear, with a low around 37. East wind 0 to 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–65°18°
Low, likely
36°2°–38°3°
Typical high / low
62°17° / 37°3°
Wind
7 mph12 km/h, gusts 16 mph26 km/h
UV peak
4
Tomorrow, Oct 24. Fog. High 66°19°, low 36°2°. Typical 62°17° / 36°2°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 37°3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 38°3°
  Dry
Official NWS forecast
Day: Patchy fog before 10am. Sunny, with a high near 66. East wind around 2 mph.
Night: Patchy fog after midnight. Mostly clear, with a low around 36. East wind 0 to 3 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
63°17°–66°19°
Low, likely
36°2°–42°6°
Typical high / low
62°17° / 36°2°
Wind
7 mph12 km/h, gusts 14 mph22 km/h
UV peak
4
Sunday, Oct 25. Fog. High 67°19°, low 37°3°. Typical 62°17° / 36°2°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 40°5°
  Dry
Official NWS forecast
Day: Patchy fog before 7am, then patchy frost and patchy fog between 7am and 10am. Sunny, with a high near 67. Northeast wind around 1 mph.
Night: Patchy fog after 3am. Mostly clear, with a low around 37. East wind around 1 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
63°17°–67°19°
Low, likely
36°2°–40°4°
Typical high / low
62°17° / 36°2°
Wind
5 mph9 km/h, gusts 10 mph17 km/h
UV peak
4
Monday, Oct 26. Fog. High 68°20°, low 42°6°. Typical 61°16° / 36°2°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 39°4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 43°6°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy fog before 7am, then patchy frost and patchy fog between 7am and 9am. Sunny, with a high near 68.
Night: Mostly clear, with a low around 42.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
66°19°–68°20°
Low, likely
35°2°–42°6°
Typical high / low
61°16° / 36°2°
Wind
5 mph8 km/h, gusts 11 mph18 km/h
UV peak
4
Tuesday, Oct 27. Partly sunny. High 67°19°, low 43°6°. Typical 61°16° / 35°2°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 43°6°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 67.
Night: Mostly cloudy, with a low around 43.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–68°20°
Low, likely
40°4°–44°7°
Typical high / low
61°16° / 35°2°
Wind
7 mph11 km/h, gusts 13 mph21 km/h
UV peak
4
Wednesday, Oct 28. Cloudy. High 69°21°, low 45°7°. Typical 61°16° / 35°2°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 69.
Night: Partly cloudy, with a low around 45.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–69°21°
Low, likely
44°7°–48°9°
Typical high / low
61°16° / 35°2°
Wind
8 mph13 km/h, gusts 13 mph22 km/h
UV peak
2
Thursday, Oct 29. Partly sunny. High 71°22°, low 46°8°. Typical 60°16° / 35°2°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 69°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 45°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 71.
Night: Partly cloudy, with a low around 46.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
68°20°–71°22°
Low, likely
43°6°–49°9°
Typical high / low
60°16° / 35°2°
Wind
11 mph17 km/h, gusts 25 mph40 km/h
UV peak
4
Friday, Oct 30. Partly sunny. High 67°19°, low 45°7°. Typical 60°16° / 34°1°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 44°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 45°7°
  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
61°16°–72°22°
Low, likely
42°6°–48°9°
Typical high / low
60°16° / 34°1°
Wind
5 mph8 km/h, gusts 16 mph26 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 70°21°, low 44°7°. Typical 59°15° / 34°1°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 44°7°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 53°11°
  20% chance
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
67°19°–72°22°
Low, likely
37°3°–49°9°
Typical high / low
59°15° / 34°1°
Wind
7 mph11 km/h, gusts 12 mph20 km/h
UV peak
4
Sunday, Nov 1. Drizzle. High 69°21°, low 53°12°. Typical 59°15° / 34°1°. Rain 0.07 in1.8 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 54°12°
  30% chance · 0.02 in0.6 mm
2. Afternoon
  noon–6 PM
  Cloudy, 69°21°
  30% chance
3. Evening
  6 PM–midnight
  Drizzle, 62°17°
  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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
66°19°–71°22°
Low, likely
47°8°–56°13°
Typical high / low
59°15° / 34°1°
Wind
10 mph16 km/h, gusts 21 mph33 km/h
UV peak
2

10 days15 days30 days

The outlook

Today
Dry, high 63°, low 37°.
Tomorrow
Dry, high 66°, low 36°, warming up.
Sunday
Dry, high 67°, low 37°.
Rest of week
Mostly dry, highs 67–71°.

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

Monongahela River at Maxwell Lock and Dam (lower pool)

7.1 mi

Below flood stage

Level: 10.5 ft
Flow: 9,050 cfs

Forecast peak 10.5 ft Fri 8 PM

Reading from Fri 5:30 PM · NWS gauge page

Monongahela River at Grays Landing Lock and Dam

10 mi

Below flood stage

Level: 11.3 ft
Flow: 6,390 cfs

Forecast peak 11.9 ft Fri 8 PM

Reading from Fri 6:31 PM · NWS gauge page

Monongahela River at Point Marion Lock and Dam (lower pool)

16 mi

Below flood stage

Level: 11.8 ft
Flow: 7,510 cfs

Forecast peak 12.1 ft Fri 8 PM

Reading from Fri 5:15 PM · NWS gauge page

Monongahela River at Charleroi Lock and Dam

17 mi

Below flood stage

Level: 8.8 ft

Forecast peak 8.8 ft Fri 8 PM

Reading from Fri 6 PM · NWS gauge page

For your home

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

Heating this week

About 73% less heating than a typical week.

This week 31Typical 116

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 26
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 18 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 45°F).

Open the windows?

Sat, 1:00 PM–6:00 PM

Good stretch to open the windows (air quality forecast not available for part of this window).

Is this typical?

Waynesburg 1 E · official normals 1991–2020 · records 1948–2026

Oct 23, today vs a typical year

Today’s expected high is about typical for the date.

Last 7 days vs normal

On average 2°1° colder than normal (daily mean temperature).

+9°+5°SatOct 17
−10°−6°SunOct 18
−4°−2°MonOct 19
−2°−1°TueOct 20
−1°WedOct 21
—ThuOct 22
−1°FriOct 23

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

Sun & moon

Sun

Daylight: 10 h 50 min; Losing 2 min 21 s a day; shortest Dec 21, 1 h 30 min less
Golden hour: 5:51–6:46 PM; Morning 7:22–8:16 AM
Blue hour: 6:46–6:56 PM; Morning 7:11–7:22 AM; first light 7:11 AM

Stars tonight? Good

Clear 7:39 PM–7:12 AM; moon 95% lit, sets 5:52 AM.

Moon

Waxing gibbous

94% lit · growing

Today: sets 4:44 AM · rises 5:00 PM
Full moon: Oct 26
New moon: Nov 9

Looking southeast from Jefferson.Skyline from USGS elevation data, heights drawn up to 5.5× taller. Sky, sun and moon as they are now.

Jefferson, PA weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Sunday

Rest of week

What changed since yesterday

Radar

Rivers

Monongahela River at Maxwell Lock and Dam (lower pool)

Monongahela River at Grays Landing Lock and Dam

Monongahela River at Point Marion Lock and Dam (lower pool)

Monongahela River at Charleroi Lock and Dam

For your home

Heating this week

Heat-pump hours, next 7 days

Comfort

Open the windows?

Is this typical?

Oct 23, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Good

Moon