Allentown weather live forecast

Today's maximum temperature in Allentown is expected to be 27°C. Select a day from the live weather forecast for Allentown, Pennsylvania, USA for more weather parameters.

Monday
31st Aug
27

20

3

5
Tuesday
1st Sep
30

20

4

7
Wednesday
2nd Sep
29

20

2

5
Thursday
3rd Sep
31

21

7

5
Friday
4th Sep
27

19

4

7

5-day weather forecast updated at 04:01 on Monday 31st 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 Monday 31st August 2026

Expect isolated thunderstorms in Allentown, Pennsylvania with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 5 (Moderate) and 3 hours of bright sunshine. There are 2-5 mm of rainfall expected with 43% chance of some rain and little or no wind of 5 kph from the south.

27
°C maximum temperature
20
°C minimum temperature
isolated thunderstorms
3
hours of sunshine
5
UV index (Moderate)
43
% chance of some rain
<5
mm of rainfall expected
L
low heat & humidity
5
kph wind from S

Allentown weather for Tuesday 1st September 2026

Expect isolated thunderstorms in Allentown, Pennsylvania with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 7 (High) and 4 hours of bright sunshine. There are 0-2 mm of rainfall expected with 44% chance of some rain and a light breeze of 11 kph from the west.

30
°C maximum temperature
20
°C minimum temperature
isolated thunderstorms
4
hours of sunshine
7
UV index (High)
44
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
11
kph wind from W

Allentown weather for Wednesday 2nd September 2026

Expect isolated thunderstorms in Allentown, Pennsylvania with a maximum temperature of 29°C, moderate levels of heat & humidity, maximum UV of 5 (Moderate) and 2 hours of bright sunshine. There are 10-20 mm of rainfall expected with 70% chance of some rain and a light breeze of 8 kph from the south.

29
°C maximum temperature
20
°C minimum temperature
isolated thunderstorms
2
hours of sunshine
5
UV index (Moderate)
70
% chance of some rain
<20
mm of rainfall expected
M
moderate heat & humidity
8
kph wind from S

Allentown weather for Thursday 3rd September 2026

Expect sunshine and showers in Allentown, Pennsylvania with a maximum temperature of 31°C, moderate levels of heat & humidity, maximum UV of 5 (Moderate) and 7 hours of bright sunshine. There are 2-5 mm of rainfall expected with 49% chance of some rain and a light breeze of 11 kph from the west.

31
°C maximum temperature
21
°C minimum temperature
sunshine and showers
7
hours of sunshine
5
UV index (Moderate)
49
% chance of some rain
<5
mm of rainfall expected
M
moderate heat & humidity
11
kph wind from W

Allentown weather for Friday 4th September 2026

Expect mostly cloudy with light rain in Allentown, Pennsylvania with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 7 (High) and 4 hours of bright sunshine. There are 2-5 mm of rainfall expected with 39% chance of some rain and a light breeze of 12 kph from the north-west.