Observed 6:55 AM EDT at KMUI

Williamstown, PA weather

Clear and 33°0°.

Forecasts agree

Now 33°0°

Clear

Wind: Calm; Light through 8 PM
Dew point: 31°−1°; Dry, static shocks likely
Humidity: 92%; Air 33°0°, dew point 31°−1° · frost likely
UV index: 0Low; Moderate 12–3 PM · peak 3
Pressure: 30.51 inHg1033 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

14°8° cooler than this time yesterday (47°8° then, 33°0° now)

Good hours for

Above 50°10° today by 11 AM
High 62°17° today at 4 PM
Below 50°10° tonight after 8 PM
Fog Monday from 7 AM

This morningUp to 54°12° by 11 AM · Clear
This afternoonUp to 62°17° by 4 PM · Clear
TonightDown to 36°2° by 5 AM · Clear
Tomorrow morningUp to 55°13° by 11 AM · Clear
Tomorrow afternoonUp to 64°18° by 4 PM · Clear
Tomorrow nightDown to 37°3° by 5 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 8a	Sunny	34°1° (likely 34°1° to 40°4°)	34°1°	0%	1 mph2 km/h from SE, gusts 5 mph8 km/h	92%	0%	0
Sat 9a	Sunny	40°4° (likely 40°4° to 44°7°)	40°4°	0%	1 mph2 km/h from SE, gusts 4 mph6 km/h	82%	0%	0
Sat 10a	Sunny	49°9° (likely 49°9° to 52°11°)	49°9°	0%	0 mph0 km/h, gusts 3 mph5 km/h	63%	0%	1
Sat 11a	Sunny	54°12° (likely 52°11° to 56°13°)	54°12°	0%	0 mph0 km/h, gusts 4 mph7 km/h	52%	0%	2
Sat 12p	Sunny	57°14° (likely 55°13° to 58°14°)	57°14°	0%	0 mph0 km/h, gusts 5 mph7 km/h	49%	2%	3
Sat 1p	Sunny	59°15° (likely 57°14° to 59°15°)	59°15°	0%	1 mph2 km/h from S, gusts 5 mph8 km/h	44%	2%	3
Sat 2p	Sunny	60°16° (likely 58°14° to 60°16°)	60°16°	0%	2 mph3 km/h from S, gusts 4 mph7 km/h	41%	4%	3
Sat 3p	Sunny	61°16° (likely 58°14° to 61°16°)	61°16°	0%	1 mph2 km/h from SE, gusts 4 mph6 km/h	39%	6%	2
Sat 4p	Sunny	62°17° (likely 58°14° to 62°17°)	62°17°	0%	1 mph2 km/h from SE, gusts 4 mph6 km/h	36%	6%	1
Sat 5p	Sunny	60°16° (likely 56°13° to 60°16°)	60°16°	0%	1 mph2 km/h from S, gusts 4 mph7 km/h	39%	6%	0
Sat 6p	Clear	55°13° (likely 52°11° to 55°13°)	55°13°	0%	1 mph2 km/h from S, gusts 6 mph9 km/h	53%	0%	0
Sat 7p	Clear	50°10° (likely 48°9° to 50°10°)	50°10°	0%	0 mph0 km/h, gusts 5 mph7 km/h	61%	0%	0
Sat 8p	Clear	45°7° (likely 45°7° to 48°9°)	45°7°	0%	0 mph0 km/h, gusts 4 mph6 km/h	70%	0%	0
Sat 9p	Clear	43°6° (likely 43°6° to 47°8°)	43°6°	0%	0 mph0 km/h, gusts 4 mph7 km/h	73%	0%	0
Sat 10p	Clear	42°6° (likely 42°6° to 46°8°)	42°6°	0%	0 mph0 km/h, gusts 5 mph7 km/h	73%	0%	0
Sat 11p	Clear	41°5° (likely 41°5° to 46°8°)	41°5°	0%	0 mph0 km/h, gusts 5 mph7 km/h	79%	0%	0
Sun 12a	Clear	40°4° (likely 40°4° to 45°7°)	40°4°	0%	0 mph0 km/h, gusts 6 mph9 km/h	76%	0%	0
Sun 1a	Clear	39°4° (likely 39°4° to 44°7°)	39°4°	0%	0 mph0 km/h, gusts 7 mph12 km/h	79%	0%	0
Sun 2a	Clear	38°3° (likely 38°3° to 44°7°)	38°3°	0%	0 mph0 km/h, gusts 7 mph11 km/h	82%	0%	0
Sun 3a	Clear	37°3° (likely 37°3° to 43°6°)	37°3°	0%	0 mph0 km/h, gusts 6 mph10 km/h	85%	0%	0
Sun 4a	Clear	37°3° (likely 37°3° to 43°6°)	37°3°	0%	0 mph0 km/h, gusts 5 mph8 km/h	82%	0%	0
Sun 5a	Clear	36°2° (likely 36°2° to 42°6°)	36°2°	0%	0 mph0 km/h, gusts 5 mph7 km/h	85%	0%	0
Sun 6a	Clear	36°2° (likely 36°2° to 42°6°)	36°2°	0%	0 mph0 km/h, gusts 4 mph7 km/h	82%	0%	0
Sun 7a	Sunny	36°2° (likely 36°2° to 42°6°)	36°2°	0%	0 mph0 km/h, gusts 4 mph7 km/h	82%	0%	0
Sun 8a	Sunny	35°2° (likely 35°2° to 42°6°)	35°2°	0%	0 mph0 km/h, gusts 4 mph6 km/h	92%	0%	0
Sun 9a	Sunny	40°4° (likely 40°4° to 45°7°)	40°4°	0%	0 mph0 km/h, gusts 3 mph5 km/h	89%	0%	1
Sun 10a	Sunny	50°10° (likely 50°10° to 51°11°)	50°10°	0%	0 mph0 km/h, gusts 5 mph8 km/h	66%	0%	2
Sun 11a	Sunny	55°13° (likely 54°12° to 56°13°)	55°13°	0%	0 mph0 km/h, gusts 5 mph8 km/h	57%	2%	3
Sun 12p	Sunny	58°14° (likely 56°13° to 59°15°)	58°14°	0%	1 mph2 km/h from W, gusts 7 mph11 km/h	53%	2%	4
Sun 1p	Sunny	61°16° (likely 58°14° to 61°16°)	61°16°	0%	2 mph3 km/h from W, gusts 6 mph10 km/h	48%	3%	4
Sun 2p	Sunny	62°17° (likely 59°15° to 62°17°)	62°17°	0%	3 mph5 km/h from SW, gusts 8 mph12 km/h	46%	3%	4
Sun 3p	Sunny	63°17° (likely 59°15° to 63°17°)	63°17°	0%	2 mph3 km/h from SW, gusts 9 mph14 km/h	44%	1%	3
Sun 4p	Sunny	64°18° (likely 58°14° to 64°18°)	64°18°	0%	2 mph3 km/h from SW, gusts 9 mph14 km/h	43%	1%	2
Sun 5p	Sunny	62°17° (likely 58°14° to 62°17°)	62°17°	0%	2 mph3 km/h from SW, gusts 8 mph14 km/h	48%	0%	1
Sun 6p	Clear	57°14° (likely 53°12° to 57°14°)	57°14°	0%	1 mph2 km/h from SW, gusts 7 mph11 km/h	59%	0%	0
Sun 7p	Clear	52°11° (likely 49°9° to 52°11°)	52°11°	0%	0 mph0 km/h, gusts 5 mph8 km/h	71%	0%	0
Sun 8p	Clear	46°8° (likely 46°8° to 49°9°)	46°8°	0%	0 mph0 km/h, gusts 6 mph9 km/h	86%	0%	0
Sun 9p	Clear	45°7° (likely 45°7° to 48°9°)	45°7°	0%	0 mph0 km/h, gusts 5 mph9 km/h	86%	0%	0
Sun 10p	Clear	44°7° (likely 44°7° to 48°9°)	44°7°	0%	0 mph0 km/h, gusts 5 mph9 km/h	89%	0%	0
Sun 11p	Clear	43°6° (likely 43°6° to 47°8°)	43°6°	0%	0 mph0 km/h, gusts 6 mph9 km/h	93%	0%	0
Mon 12a	Clear	42°6° (likely 42°6° to 46°8°)	42°6°	0%	0 mph0 km/h, gusts 6 mph10 km/h	96%	4%	0
Mon 1a	Clear	41°5° (likely 41°5° to 46°8°)	41°5°	0%	1 mph2 km/h from W, gusts 5 mph8 km/h	96%	5%	0
Mon 2a	Clear	40°4° (likely 40°4° to 45°7°)	40°4°	0%	1 mph2 km/h from W, gusts 5 mph8 km/h	96%	6%	0
Mon 3a	Clear	39°4° (likely 39°4° to 44°7°)	39°4°	0%	1 mph2 km/h from W, gusts 3 mph5 km/h	96%	14%	0
Mon 4a	Clear	38°3° (likely 38°3° to 44°7°)	38°3°	0%	1 mph2 km/h from W, gusts 3 mph5 km/h	100%	10%	0
Mon 5a	Clear	37°3° (likely 36°2° to 43°6°)	37°3°	0%	1 mph2 km/h from NW, gusts 3 mph4 km/h	100%	12%	0
Mon 6a	Clear	36°2° (likely 36°2° to 42°6°)	36°2°	0%	1 mph2 km/h from NW, gusts 3 mph4 km/h	100%	15%	0
Mon 7a	Fog	35°2° (likely 35°2° to 41°5°)	35°2°	0%	1 mph2 km/h from NW, gusts 3 mph4 km/h	100%	23%	0

Days ahead

Tap a day for its hours and the official wording.

Today, Oct 24. Sunny. High 62°17°, low 34°1°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 34°1°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 45°7°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 36°2°
  Dry
Official NWS forecast
Today: Sunny, with a high near 62. Southeast wind around 2 mph.
Tonight: Patchy fog after 3am. Clear, with a low around 34. Southeast wind around 1 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
58°14°–62°17°
Low, likely
34°1°–39°4°
Wind
8 mph12 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 64°18°, low 35°2°. Dry. Mostly 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, 46°8°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 37°3°
  Dry
Official NWS forecast
Day: Patchy fog before 10am. Sunny, with a high near 64. Southwest wind 0 to 3 mph.
Night: Patchy fog after 10pm. Clear, with a low around 35. Southwest wind around 1 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–64°18°
Low, likely
35°2°–42°6°
Wind
7 mph11 km/h, gusts 13 mph21 km/h
UV peak
4
Monday, Oct 26. Fog. High 68°20°, low 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 40°4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 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. Northwest wind 1 to 5 mph.
Night: Mostly clear, with a low around 41.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–68°20°
Low, likely
37°3°–42°6°
Wind
8 mph12 km/h, gusts 16 mph25 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 62°17°, low 35°2°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 60°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 47°8°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 39°4°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 62.
Night: Mostly clear, with a low around 35.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
59°15°–62°17°
Low, likely
35°2°–45°7°
Wind
9 mph14 km/h, gusts 18 mph28 km/h
UV peak
4
Wednesday, Oct 28. Partly sunny. High 60°16°, low 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 38°3°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 57°14°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 50°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 44°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 60.
Night: Mostly cloudy, with a low around 40.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
56°13°–60°16°
Low, likely
35°2°–40°4°
Wind
8 mph13 km/h, gusts 21 mph33 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 68°20°, low 45°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 43°6°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  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 45.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–68°20°
Low, likely
41°5°–46°8°
Wind
8 mph13 km/h, gusts 24 mph39 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 69°21°, low 43°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 45°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 69.
Night: Mostly clear, with a low around 43.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
64°18°–70°21°
Low, likely
43°6°–49°9°
Wind
9 mph14 km/h, gusts 24 mph39 km/h
UV peak
3
Saturday, Oct 31. Cloudy. High 66°19°, low 46°8°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 44°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 47°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
59°15°–71°22°
Low, likely
37°3°–52°11°
Wind
9 mph14 km/h, gusts 29 mph46 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 63°17°, low 47°8°. Rain 0.01 in0.3 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 62°17°
  30% chance
3. Evening
  6 PM–midnight
  Cloudy, 55°13°
  30% chance
4. Overnight
  midnight–6 AM
  Partly cloudy, 50°10°
  30% 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
53°12°–67°19°
Low, likely
37°3°–52°11°
Wind
8 mph13 km/h, gusts 15 mph24 km/h
UV peak
3
Monday, Nov 2. Cloudy. High 63°17°, low 50°10°. Rain 0.11 in2.8 mm, 40% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 54°12°
  30% chance · 0.02 in0.5 mm
2. Afternoon
  noon–6 PM
  Drizzle, 63°17°
  30% chance · 0.01 in0.3 mm
3. Evening
  6 PM–midnight
  Cloudy, 53°12°
  30% 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.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
50°10°–70°21°
Low, likely
38°3°–56°13°
Wind
10 mph15 km/h, gusts 17 mph27 km/h
UV peak
2

10 days15 days30 days

The outlook

Today
Dry, high 62°, low 34°.
Tomorrow
Dry, high 64°, low 35°.
Monday
Dry, high 68°, low 41°, warming up.
Rest of week
Mostly dry, highs 60–69°.

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

Swatara Creek at Harper Tavern

13 mi

Below flood stage

Level: 0.7 ft
Flow: 217 cfs

Forecast peak 0.7 ft Sat 8 AM

Reading from Sat 6:15 AM · NWS gauge page

Swatara Creek near Hershey

20 mi

Below flood stage

Level: 1.8 ft
Flow: 318 cfs

Forecast peak 1.9 ft Sat 8 AM

Reading from Sat 5:45 AM · NWS gauge page

Susquehanna River at Sunbury

21 mi

Below flood stage

Level: 7.2 ft
Flow: 8,380 cfs

Forecast peak 7.2 ft Sat 8 AM

Reading from Sat 5:45 AM · NWS gauge page

Swatara Creek near Inwood

8.4 mi

Level: 2.4 ft
Flow: 105 cfs

Reading from Sat 6:15 AM · NWS gauge page

Sun & moon

Sun

Daylight: 10 h 46 min; Losing 2 min 30 s a day; shortest Dec 21, 1 h 30 min less
Golden hour: 5:35–6:30 PM; Morning 7:10–8:05 AM
Blue hour: 6:30–6:41 PM; Morning 6:59–7:10 AM; first light 6:59 AM

Stars tonight? Fair

Clear 6:41 PM–7 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

96% lit · growing

Today: sets 5:38 AM · rises 5:10 PM
Full moon: Oct 26
New moon: Nov 9

Looking southeast from Williamstown. The highest point on the skyline is about 1,600 ft, 1 mi away.Skyline from USGS elevation data, heights drawn up to 3× taller. Sky, sun and moon as they are now.

Williamstown, PA weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Swatara Creek at Harper Tavern

Swatara Creek near Hershey

Susquehanna River at Sunbury

Swatara Creek near Inwood

Sun & moon

Sun

Stars tonight? Fair

Moon