Allentown weather live forecast

Today's maximum temperature in Allentown is expected to be 28°C. Select a day from the live weather forecast for Allentown, Pennsylvania, USA for more weather parameters.

Sunday
30th Aug
28

16

3

3
Monday
31st Aug
25

20

1

5
Tuesday
1st Sep
32

20

5

7
Wednesday
2nd Sep
27

21

4

6
Thursday
3rd Sep
30

22

5

7

5-day weather forecast updated at 04:01 on Sunday 30th 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 Sunday 30th August 2026

Expect isolated thunderstorms in Allentown, Pennsylvania with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 3 (Moderate) and 3 hours of bright sunshine. There are 2-5 mm of rainfall expected with 44% chance of some rain and a gentle breeze of 13 kph from the south-west.

28
°C maximum temperature
16
°C minimum temperature
isolated thunderstorms
3
hours of sunshine
3
UV index (Moderate)
44
% chance of some rain
<5
mm of rainfall expected
L
low heat & humidity
13
kph wind from SW

Allentown weather for Monday 31st August 2026

Expect isolated thunderstorms in Allentown, Pennsylvania with a maximum temperature of 25°C, maximum UV of 5 (Moderate) and 1 hour of bright sunshine. There are 10-20 mm of rainfall expected with 40% chance of some rain and little or no wind of 5 kph from the north-east.

25
°C maximum temperature
20
°C minimum temperature
isolated thunderstorms
1
hour of sunshine
5
UV index (Moderate)
40
% chance of some rain
<20
mm of rainfall expected
0
no heat & humidity
5
kph wind from NE

Allentown weather for Tuesday 1st September 2026

Expect isolated thunderstorms in Allentown, Pennsylvania with a maximum temperature of 32°C, moderate levels of heat & humidity, maximum UV of 7 (High) and 5 hours of bright sunshine. There are 2-5 mm of rainfall expected with 41% chance of some rain and a light breeze of 12 kph from the west.

32
°C maximum temperature
20
°C minimum temperature
isolated thunderstorms
5
hours of sunshine
7
UV index (High)
41
% chance of some rain
<5
mm of rainfall expected
M
moderate heat & humidity
12
kph wind from W

Allentown weather for Wednesday 2nd September 2026

Expect mostly cloudy with rain in Allentown, Pennsylvania with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 6 (High) and 4 hours of bright sunshine. There are 5-10 mm of rainfall expected with 69% chance of some rain and little or no wind of 6 kph from the south-east.

27
°C maximum temperature
21
°C minimum temperature
mostly cloudy with rain
4
hours of sunshine
6
UV index (High)
69
% chance of some rain
<10
mm of rainfall expected
L
low heat & humidity
6
kph wind from SE

Allentown weather for Thursday 3rd 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 5 hours of bright sunshine. There are 10-20 mm of rainfall expected with 53% chance of some rain and a light breeze of 11 kph from the west.