Live Weather & Forecast
Weather in Allentown
Pennsylvania, United States · Real-time conditions & 3-day outlook
5°C
Feels like 4°C
41°F / Feels 39°F
Sunny
Allentown, Pennsylvania
🌞 Daytime
Updated: 2026-04-12 08:00
Humidity
65%
Wind
5.4 km/h ENE
Wind Gust
7.1 km/h
Pressure
1034 mb
Visibility
16 km
UV Index
0.6
(Low)
Precipitation
0 mm
Cloud Cover
0%
Dew Point
-1.6°C
Wind Degree
72°
Air Quality Index
US EPA: Good
UK DEFRA: Low (1)
CO
194.9 μg/m³
NO₂
6.7 μg/m³
O₃
88 μg/m³
SO₂
4.2 μg/m³
PM 2.5
6.1 μg/m³
PM 10
6.9 μg/m³
Weather Alerts 1
Met
· Minor · Expected
Frost Advisory issued April 11 at 1:54PM EDT until April 12 at 8:00AM EDT by NWS Mount Holly NJ
* WHAT...Temperatures as low as 36 will result in frost formation. * WHERE...Berks, Western Chester, and Western Montgomery Counties. * WHEN...From 2 AM to 8 AM EDT Sunday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.
Take steps now to protect tender plants from the cold.
Today's Hourly Forecast
24-hour breakdown for Allentown, Pennsylvania
12 AM
9°
Clear
1 AM
8°
Clear
2 AM
7°
Clear
3 AM
6°
Clear
4 AM
5°
Clear
5 AM
4°
Clear
6 AM
4°
Clear
7 AM
4°
Sunny
8 AM
5°
Sunny
9 AM
8°
Sunny
10 AM
10°
Sunny
11 AM
13°
Sunny
12 PM
14°
Sunny
1 PM
16°
Sunny
2 PM
18°
Sunny
3 PM
20°
Sunny
4 PM
21°
Sunny
5 PM
17°
Sunny
6 PM
15°
Cloudy
7 PM
13°
Partly Cloudy
8 PM
11°
Cloudy
9 PM
10°
Clear
10 PM
9°
Partly Cloudy
11 PM
8°
Clear
3-Day Forecast
Daily overview for Allentown, Pennsylvania
Today
Sunny
22°
/
3°
🌧️ 0% chance of rain
💧 Avg. humidity: 51%
💨 Max wind: 17.6 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.6
🌅 Sunrise: 06:28 AM
🌇 Sunset: 07:39 PM
🌙 Waning Crescent
🌑 Moon: 33% lit
Mon, Apr 13
Overcast
22°
/
6°
🌧️ 0% chance of rain
💧 Avg. humidity: 84%
💨 Max wind: 28.8 km/h
🌧️ Total precip: 0.03 mm
☀️ UV Index: 1
🌅 Sunrise: 06:26 AM
🌇 Sunset: 07:40 PM
🌙 Waning Crescent
🌑 Moon: 23% lit
Tue, Apr 14
Partly Cloudy
26°
/
15°
🌧️ 0% chance of rain
💧 Avg. humidity: 75%
💨 Max wind: 22 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.9
🌅 Sunrise: 06:25 AM
🌇 Sunset: 07:41 PM
🌙 Waning Crescent
🌑 Moon: 15% lit
Best Time to Visit Allentown
Plan your trip to Allentown, United States around the most favorable weather conditions.
Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
Frequently Asked Questions
What is the current weather in Allentown?
Current conditions in Allentown: Sunny, temperature 5°C, humidity 65%.
What is the best time to visit Allentown?
The best time to visit Allentown is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Allentown?
Allentown is located at approximately 40.6° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Allentown?
The wettest period in Allentown is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Allentown?
For visits to Allentown during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Allentown in?
Allentown is located in United States, in the state of Pennsylvania.
What are the public holidays in Allentown in 2026?
View the 2026 public holidays for Allentown on our Holidays page.
What are the GPS coordinates used for the weather forecast in Allentown?
The weather forecast for Allentown uses coordinates 40.6022, -75.4713.