Allentown weather live forecast

Today's maximum temperature in Allentown is expected to be 30°C. Select a day from the live weather forecast for Allentown, Pennsylvania, USA for more weather parameters.

Tuesday
1st Sep
30

20

5

5
Wednesday
2nd Sep
24

19

0

2
Thursday
3rd Sep
31

20

5

4
Friday
4th Sep
28

18

4

7
Saturday
5th Sep
26

15

8

6

5-day weather forecast updated at 04:01 on Tuesday 1st September 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 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 5 (Moderate) and 5 hours of bright sunshine. There are 5-10 mm of rainfall expected with 59% chance of some rain and a light breeze of 11 kph from the west.

30
°C maximum temperature
20
°C minimum temperature
isolated thunderstorms
5
hours of sunshine
5
UV index (Moderate)
59
% chance of some rain
<10
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 24°C, maximum UV of 2 (Low) and no hours of bright sunshine. There are 10-20 mm of rainfall expected with 63% chance of some rain and a light breeze of 9 kph from the east.

24
°C maximum temperature
19
°C minimum temperature
isolated thunderstorms
0
hours of sunshine
2
UV index (Low)
63
% chance of some rain
<20
mm of rainfall expected
0
no heat & humidity
9
kph wind from E

Allentown weather for Thursday 3rd September 2026

Expect isolated thunderstorms in Allentown, Pennsylvania with a maximum temperature of 31°C, moderate levels of heat & humidity, maximum UV of 4 (Moderate) and 5 hours of bright sunshine. There are 5-10 mm of rainfall expected with 77% chance of some rain and a light breeze of 12 kph from the west.

31
°C maximum temperature
20
°C minimum temperature
isolated thunderstorms
5
hours of sunshine
4
UV index (Moderate)
77
% chance of some rain
<10
mm of rainfall expected
M
moderate heat & humidity
12
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 28°C, low levels of heat & humidity, maximum UV of 7 (High) and 4 hours of bright sunshine. There are 0-2 mm of rainfall expected with 31% chance of some rain and a gentle breeze of 13 kph from the north-west.

28
°C maximum temperature
18
°C minimum temperature
mostly cloudy with light rain
4
hours of sunshine
7
UV index (High)
31
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
13
kph wind from NW

Allentown weather for Saturday 5th September 2026

Expect scattered clouds in Allentown, Pennsylvania with a maximum temperature of 26°C, maximum UV of 6 (High) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the north.