Allentown weather live forecast

Today's maximum temperature in Allentown is expected to be 55°F. Select a day from the live weather forecast for Allentown, Pennsylvania, USA for more weather parameters.

Friday
19th Dec
55

27

2

1
Saturday
20th Dec
34

27

5

2
Sunday
21st Dec
41

25

7

1
Monday
22nd Dec
34

23

4

1
Tuesday
23rd Dec
36

27

0

1

5-day weather forecast updated at 04:02 on Friday 19th December 2025 GMT

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The 5-day weather forecast for Pennsylvania (Allentown) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Allentown weather forecast by day

Below are the detailed weather forecasts for Allentown for the next 5 days.

Allentown weather for Friday 19th December 2025

Expect mostly cloudy with rain in Allentown, Pennsylvania with a maximum temperature of 55°F, maximum UV of 1 (Low) and 2 hours of bright sunshine. There are 10-20 mm of rainfall expected with 79% chance of some rain and a fresh breeze of 19 mph from the west.

55
°F maximum temperature
27
°F minimum temperature
mostly cloudy with rain
2
hours of sunshine
1
UV index (Low)
79
% chance of some rain
<20
mm of rainfall expected
55
°F wind chill
19
mph wind from W

Allentown weather for Saturday 20th December 2025

Expect broken clouds in Allentown, Pennsylvania with a maximum temperature of 34°F, maximum UV of 2 (Low) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 14 mph from the west.

34
°F maximum temperature
27
°F minimum temperature
broken clouds
5
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
25
°F wind chill
14
mph wind from W

Allentown weather for Sunday 21st December 2025

Expect scattered clouds in Allentown, Pennsylvania with a maximum temperature of 41°F, maximum UV of 1 (Low) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 15 mph from the west.

41
°F maximum temperature
25
°F minimum temperature
scattered clouds
7
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
34
°F wind chill
15
mph wind from W

Allentown weather for Monday 22nd December 2025

Expect broken clouds in Allentown, Pennsylvania with a maximum temperature of 34°F, maximum UV of 1 (Low) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 10 mph from the north-west.

34
°F maximum temperature
23
°F minimum temperature
broken clouds
4
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
25
°F wind chill
10
mph wind from NW

Allentown weather for Tuesday 23rd December 2025

Expect overcast skies in Allentown, Pennsylvania with a maximum temperature of 36°F, maximum UV of 1 (Low) and no hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 8 mph from the south-west.