Observed 4:15 AM EDT at KTHV

Jacobus, PA weather

Foggy and 34°1°.

Forecasts agree

Now 34°1°

Fog

Wind: Calm; Light through 4 PM
Visibility: 4 mi6 km; Fog · under 5 mi8 km
Dew point: 34°1°; Dry, static shocks likely
Humidity: 100%; Air 34°1°, dew point 34°1° · frost likely
UV index: 0Low; Moderate 11 AM–5 PM · peak 4
Air quality: 86Moderate; Main pollutant: PM2.5 (fine particles)
Pressure: 30.49 inHg1033 hPa; Rising slowly · +0.02 inHg+0.8 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Low 36°2° today at 6 AM
Above 50°10° today by 11 AM
High 61°16° today at 4 PM
Below 50°10° tonight after 8 PM

TonightNear 37°3° · Clear
This morningUp to 53°12° by 11 AM · Clear
This afternoonUp to 61°16° by 4 PM · Clear
TonightDown to 37°3° by 5 AM · Clear
Tomorrow morningUp to 54°12° by 11 AM · Clear
Tomorrow afternoonUp to 64°18° by 5 PM · Clear
Tomorrow nightDown to 41°5° by 3 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 4a	Clear	37°3° (likely 37°3° to 41°5°)	37°3°	0%	0 mph0 km/h, gusts 5 mph7 km/h	100%	11%	0
Sat 5a	Clear	37°3° (likely 37°3° to 40°4°)	37°3°	0%	0 mph0 km/h, gusts 3 mph6 km/h	100%	15%	0
Sat 6a	Mostly clear	36°2° (likely 36°2° to 39°4°)	36°2°	0%	0 mph0 km/h, gusts 3 mph5 km/h	100%	25%	0
Sat 7a	Sunny	36°2° (likely 34°1° to 38°3°)	36°2°	0%	0 mph0 km/h, gusts 4 mph6 km/h	96%	31%	0
Sat 8a	Mostly sunny	36°2° (likely 33°1° to 39°4°)	36°2°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	16%	0
Sat 9a	Sunny	42°6° (likely 39°4° to 44°7°)	42°6°	0%	0 mph0 km/h, gusts 4 mph7 km/h	93%	11%	1
Sat 10a	Sunny	49°9° (likely 48°9° to 50°10°)	49°9°	0%	0 mph0 km/h, gusts 4 mph7 km/h	71%	4%	2
Sat 11a	Sunny	53°12° (likely 53°12° to 55°13°)	53°12°	0%	1 mph2 km/h from E, gusts 5 mph8 km/h	61%	0%	3
Sat 12p	Sunny	56°13° (likely 55°13° to 58°14°)	56°13°	0%	2 mph3 km/h from E, gusts 6 mph10 km/h	51%	0%	4
Sat 1p	Sunny	59°15° (likely 57°14° to 59°15°)	59°15°	0%	2 mph3 km/h from SE, gusts 5 mph8 km/h	44%	0%	4
Sat 2p	Sunny	60°16° (likely 58°14° to 60°16°)	60°16°	0%	2 mph3 km/h from SE, gusts 5 mph7 km/h	41%	0%	4
Sat 3p	Sunny	60°16° (likely 59°15° to 60°16°)	60°16°	0%	2 mph3 km/h from SE, gusts 4 mph6 km/h	41%	0%	4
Sat 4p	Sunny	61°16° (likely 58°14° to 61°16°)	61°16°	0%	2 mph3 km/h from SE, gusts 5 mph8 km/h	39%	0%	3
Sat 5p	Sunny	60°16° (likely 57°14° to 60°16°)	60°16°	0%	2 mph3 km/h from E, gusts 5 mph8 km/h	41%	0%	1
Sat 6p	Clear	57°14° (likely 53°12° to 57°14°)	57°14°	0%	1 mph2 km/h from E, gusts 7 mph11 km/h	47%	0%	0
Sat 7p	Clear	52°11° (likely 48°9° to 52°11°)	52°11°	0%	1 mph2 km/h from SE, gusts 6 mph10 km/h	56%	0%	0
Sat 8p	Clear	47°8° (likely 45°7° to 48°9°)	47°8°	0%	1 mph2 km/h from SE, gusts 8 mph13 km/h	74%	0%	0
Sat 9p	Clear	45°7° (likely 43°6° to 47°8°)	45°7°	0%	0 mph0 km/h, gusts 8 mph13 km/h	76%	0%	0
Sat 10p	Clear	43°6° (likely 42°6° to 45°7°)	43°6°	0%	0 mph0 km/h, gusts 7 mph12 km/h	79%	0%	0
Sat 11p	Clear	42°6° (likely 41°5° to 44°7°)	42°6°	0%	0 mph0 km/h, gusts 7 mph11 km/h	82%	0%	0
Sun 12a	Clear	41°5° (likely 41°5° to 44°7°)	41°5°	0%	0 mph0 km/h, gusts 7 mph11 km/h	85%	0%	0
Sun 1a	Clear	40°4° (likely 40°4° to 43°6°)	40°4°	0%	0 mph0 km/h, gusts 6 mph10 km/h	85%	0%	0
Sun 2a	Clear	39°4° (likely 39°4° to 42°6°)	39°4°	0%	0 mph0 km/h, gusts 6 mph10 km/h	92%	1%	0
Sun 3a	Clear	39°4° (likely 39°4° to 42°6°)	39°4°	0%	0 mph0 km/h, gusts 6 mph9 km/h	89%	1%	0
Sun 4a	Clear	38°3° (likely 38°3° to 41°5°)	38°3°	0%	0 mph0 km/h, gusts 5 mph8 km/h	92%	0%	0
Sun 5a	Clear	37°3° (likely 37°3° to 41°5°)	37°3°	0%	0 mph0 km/h, gusts 3 mph6 km/h	96%	0%	0
Sun 6a	Clear	36°2° (likely 36°2° to 40°4°)	36°2°	0%	0 mph0 km/h, gusts 2 mph3 km/h	100%	2%	0
Sun 7a	Sunny	36°2° (likely 35°2° to 39°4°)	36°2°	0%	0 mph0 km/h, gusts 2 mph2 km/h	96%	4%	0
Sun 8a	Sunny	35°2° (likely 35°2° to 39°4°)	35°2°	0%	0 mph0 km/h, gusts 1 mph2 km/h	100%	5%	0
Sun 9a	Sunny	41°5° (likely 40°4° to 44°7°)	41°5°	0%	0 mph0 km/h, gusts 1 mph2 km/h	92%	4%	1
Sun 10a	Sunny	50°10° (likely 49°9° to 51°11°)	50°10°	0%	0 mph0 km/h, gusts 1 mph2 km/h	71%	3%	2
Sun 11a	Sunny	54°12° (likely 54°12° to 56°13°)	54°12°	0%	0 mph0 km/h, gusts 3 mph5 km/h	64%	2%	3
Sun 12p	Sunny	57°14° (likely 57°14° to 59°15°)	57°14°	0%	0 mph0 km/h, gusts 5 mph8 km/h	57%	3%	4
Sun 1p	Sunny	60°16° (likely 59°15° to 61°16°)	60°16°	0%	1 mph2 km/h from W, gusts 5 mph7 km/h	51%	12%	4
Sun 2p	Sunny	62°17° (likely 60°16° to 62°17°)	62°17°	0%	2 mph3 km/h from W, gusts 6 mph10 km/h	48%	10%	4
Sun 3p	Sunny	63°17° (likely 61°16° to 63°17°)	63°17°	0%	2 mph3 km/h from SW, gusts 6 mph10 km/h	46%	6%	4
Sun 4p	Sunny	63°17° (likely 60°16° to 63°17°)	63°17°	0%	2 mph3 km/h from SW, gusts 7 mph11 km/h	46%	5%	3
Sun 5p	Sunny	64°18° (likely 59°15° to 64°18°)	64°18°	0%	2 mph3 km/h from SW, gusts 7 mph11 km/h	45%	2%	1
Sun 6p	Clear	60°16° (likely 55°13° to 60°16°)	60°16°	0%	0 mph0 km/h, gusts 6 mph10 km/h	53%	0%	0
Sun 7p	Clear	56°13° (likely 51°11° to 56°13°)	56°13°	0%	0 mph0 km/h, gusts 4 mph6 km/h	62%	0%	0
Sun 8p	Clear	53°12° (likely 49°9° to 53°12°)	53°12°	0%	0 mph0 km/h, gusts 3 mph5 km/h	71%	1%	0
Sun 9p	Clear	47°8° (likely 46°8° to 48°9°)	47°8°	0%	0 mph0 km/h, gusts 5 mph7 km/h	86%	1%	0
Sun 10p	Clear	44°7° (likely 44°7° to 46°8°)	44°7°	0%	0 mph0 km/h, gusts 5 mph8 km/h	93%	0%	0
Sun 11p	Clear	44°7° (likely 42°6° to 45°7°)	44°7°	0%	1 mph2 km/h from S, gusts 5 mph9 km/h	93%	1%	0
Mon 12a	Clear	43°6° (likely 41°5° to 44°7°)	43°6°	0%	1 mph2 km/h from SW, gusts 6 mph9 km/h	96%	0%	0
Mon 1a	Clear	43°6° (likely 40°4° to 44°7°)	43°6°	0%	1 mph2 km/h from SW, gusts 6 mph9 km/h	93%	1%	0
Mon 2a	Clear	42°6° (likely 40°4° to 44°7°)	42°6°	0%	1 mph2 km/h from SW, gusts 5 mph8 km/h	96%	1%	0
Mon 3a	Clear	41°5° (likely 38°3° to 44°7°)	41°5°	0%	1 mph2 km/h from SW, gusts 3 mph5 km/h	100%	1%	0

Days ahead

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

Today, Oct 24. Mostly sunny. High 62°17°, low 36°2°. Typical 62°17° / 43°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 47°8°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 37°3°
  Dry
Official NWS forecast
Today: Sunny, with a high near 62. East wind around 2 mph.
Tonight: Mostly clear, with a low around 36. Wind around 0 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
59°15°–62°17°
Low, likely
33°1°–38°3°
Typical high / low
62°17° / 43°6°
Wind
7 mph11 km/h
UV peak
4
Tomorrow, Oct 25. Fog. High 65°18°, low 37°3°. Typical 62°17° / 42°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 35°2°
  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, 41°5°
  Dry
Official NWS forecast
Day: Areas of fog between 9am and 10am. Sunny, with a high near 65. West wind around 2 mph.
Night: Areas of fog between 10pm and 5am. Clear, with a low around 37. Southwest wind around 1 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
61°16°–65°18°
Low, likely
35°2°–39°4°
Typical high / low
62°17° / 42°6°
Wind
7 mph11 km/h
UV peak
4
Monday, Oct 26. Fog. High 68°20°, low 45°7°. Typical 62°17° / 42°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 40°4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 48°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy fog before 9am. Sunny, with a high near 68.
Night: Mostly clear, with a low around 45.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
66°19°–68°20°
Low, likely
37°3°–45°7°
Typical high / low
62°17° / 42°6°
Wind
9 mph15 km/h, gusts 15 mph24 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 63°17°, low 40°4°. Typical 61°16° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 51°10°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 41°5°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 63.
Night: Mostly clear, with a low around 40.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–64°18°
Low, likely
40°4°–47°8°
Typical high / low
61°16° / 42°6°
Wind
10 mph16 km/h, gusts 22 mph35 km/h
UV peak
4
Wednesday, Oct 28. Partly sunny. High 62°17°, low 44°7°. Typical 61°16° / 41°5°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 40°4°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 59°15°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 50°10°
  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 62.
Night: Mostly cloudy, with a low around 44.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
57°14°–62°17°
Low, likely
37°3°–44°7°
Typical high / low
61°16° / 41°5°
Wind
8 mph13 km/h, gusts 19 mph30 km/h
UV peak
4
Thursday, Oct 29. Mostly sunny. High 68°20°, low 48°9°. Typical 61°16° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 44°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 68.
Night: Mostly clear, with a low around 48.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–68°20°
Low, likely
41°5°–48°9°
Typical high / low
61°16° / 41°5°
Wind
9 mph14 km/h, gusts 24 mph39 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 70°21°, low 46°8°. Typical 60°16° / 41°5°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 46°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 70.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
65°18°–71°22°
Low, likely
43°6°–49°9°
Typical high / low
60°16° / 41°5°
Wind
9 mph15 km/h, gusts 22 mph36 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 67°19°, low 45°7°. Typical 60°16° / 40°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 48°9°
  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.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
60°16°–72°22°
Low, likely
42°6°–49°9°
Typical high / low
60°16° / 40°4°
Wind
8 mph13 km/h, gusts 17 mph28 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 65°18°, low 49°9°. Typical 60°16° / 40°4°. Rain 0.01 in0.3 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 56°13°
  20% chance
4. Overnight
  midnight–6 AM
  Cloudy, 57°14°
  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.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
57°14°–69°21°
Low, likely
45°7°–53°12°
Typical high / low
60°16° / 40°4°
Wind
11 mph18 km/h, gusts 25 mph40 km/h
UV peak
1
Monday, Nov 2. Cloudy. High 66°19°, low 56°13°. Typical 59°15° / 40°4°. Rain 0.19 in4.8 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 59°15°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 66°19°
  20% chance · 0.09 in2.2 mm
3. Evening
  6 PM–midnight
  Cloudy, 59°15°
  20% chance · 0.04 in0.9 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
63°17°–71°22°
Low, likely
53°12°–58°14°
Typical high / low
59°15° / 40°4°
Wind
18 mph29 km/h, gusts 35 mph56 km/h
UV peak
2

10 days15 days30 days

The outlook

Today
Dry, high 62°, low 36°.
Tomorrow
Dry, high 65°, low 37°, warming up.
Monday
Dry, high 68°, low 45°, warming up.
Rest of week
Mostly dry, highs 62–70°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (CTP) (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

Susquehanna River at Marietta

15 mi

Below flood stage

Level: 34.4 ft
Flow: 13,700 cfs

Forecast peak 34.4 ft Sat 8 AM

Reading from Sat 2:30 AM · NWS gauge page

Central PA Dams Indian Rock Dam on Codorus Creek

3.6 mi

Below flood stage

Level: 373 ft

Reading from Sat 3 AM · NWS gauge page

Codorus Creek near York

5.0 mi

Level: 2.1 ft
Flow: 74 cfs

Reading from Sat 2 AM · NWS gauge page

Codorus Creek at Spring Grove

7.5 mi

Level: 0.8 ft
Flow: 16 cfs

Reading from Sat 3 AM · NWS gauge page

For your home

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

Heating this week

About 65% less heating than a typical week.

This week 33Typical 95

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 34°F).

Open the windows?

Today, 2:00 PM–5:00 PM

Good stretch to open the windows.

Is this typical?

Millers 4 NE · official normals 1991–2020 · records 1988–2026

Oct 24, 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).

−7°−4°SunOct 18
−4°−2°MonOct 19
+4°+2°TueOct 20
±0°WedOct 21
±0°ThuOct 22
—FriOct 23
—SatOct 24

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

Sun & moon

Sun

Daylight: 10 h 48 min; Losing 2 min 25 s a day; shortest Dec 21, 1 h 27 min less
Golden hour: 5:37–6:31 PM; Morning 7:09–8:04 AM
Blue hour: 6:31–6:42 PM; Morning 6:59–7:09 AM; first light 6:59 AM

Stars tonight? Good

Mostly clear 4:35–6:59 AM; moon 96% lit, sets 5:38 AM.

Moon

Waxing gibbous

96% lit · growing

Today: sets 5:38 AM · rises 5:11 PM
Full moon: Oct 26
New moon: Nov 9

Looking southeast from Jacobus. The highest point on the skyline is about 4,200 ft, 28 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.