Allentown weather live forecast

Today's maximum temperature in Allentown is expected to be 81°F. Select a day from the live weather forecast for Allentown, Pennsylvania, USA for more weather parameters.

Thursday
27th Aug
81

68

2

5
Friday
28th Aug
81

68

6

6
Saturday
29th Aug
82

64

9

6
Sunday
30th Aug
86

64

8

5
Monday
31st Aug
82

68

3

5

5-day weather forecast updated at 04:01 on Thursday 27th August 2026 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 Thursday 27th August 2026

Expect isolated thunderstorms in Allentown, Pennsylvania with a maximum temperature of 81°F, low levels of heat & humidity, maximum UV of 5 (Moderate) and 2 hours of bright sunshine. There are 20-30 mm of rainfall expected with 90% chance of some rain and a gentle breeze of 8 mph from the south.

81
°F maximum temperature
68
°F minimum temperature
isolated thunderstorms
2
hours of sunshine
5
UV index (Moderate)
90
% chance of some rain
<30
mm of rainfall expected
L
low heat & humidity
8
mph wind from S

Allentown weather for Friday 28th August 2026

Expect isolated thunderstorms in Allentown, Pennsylvania with a maximum temperature of 81°F, low levels of heat & humidity, maximum UV of 6 (High) and 6 hours of bright sunshine. There are 2-5 mm of rainfall expected with 28% chance of some rain and little or no wind of 3 mph from the north-west.

81
°F maximum temperature
68
°F minimum temperature
isolated thunderstorms
6
hours of sunshine
6
UV index (High)
28
% chance of some rain
<5
mm of rainfall expected
L
low heat & humidity
3
mph wind from NW

Allentown weather for Saturday 29th August 2026

Expect broken clouds in Allentown, Pennsylvania with a maximum temperature of 82°F, low levels of heat & humidity, maximum UV of 6 (High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and little or no wind of 4 mph from the north.

82
°F maximum temperature
64
°F minimum temperature
broken clouds
9
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
L
low heat & humidity
4
mph wind from N

Allentown weather for Sunday 30th August 2026

Expect broken clouds in Allentown, Pennsylvania with a maximum temperature of 86°F, moderate levels of heat & humidity, maximum UV of 5 (Moderate) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 mph from the south-west.

86
°F maximum temperature
64
°F minimum temperature
broken clouds
8
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
M
moderate heat & humidity
7
mph wind from SW

Allentown weather for Monday 31st August 2026

Expect broken clouds in Allentown, Pennsylvania with a maximum temperature of 82°F, low levels of heat & humidity, maximum UV of 5 (Moderate) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 5 mph from the west.