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.

Wednesday
19th Aug
30

18

12

7
Thursday
20th Aug
25

18

0

5
Friday
21st Aug
28

16

9

8
Saturday
22nd Aug
26

17

6

6
Sunday
23rd Aug
27

18

7

5

5-day weather forecast updated at 04:01 on Wednesday 19th 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 Wednesday 19th August 2026

Expect scattered clouds in Allentown, Pennsylvania with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 7 (High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the west.

30
°C maximum temperature
18
°C minimum temperature
scattered clouds
12
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
M
moderate heat & humidity
12
kph wind from W

Allentown weather for Thursday 20th August 2026

Expect mostly cloudy with rain in Allentown, Pennsylvania with a maximum temperature of 25°C, maximum UV of 5 (Moderate) and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 64% chance of some rain and a light breeze of 7 kph from the north.

25
°C maximum temperature
18
°C minimum temperature
mostly cloudy with rain
0
hours of sunshine
5
UV index (Moderate)
64
% chance of some rain
<10
mm of rainfall expected
25
°C wind chill
7
kph wind from N

Allentown weather for Friday 21st August 2026

Expect broken clouds in Allentown, Pennsylvania with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 8 (Very High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 8 kph from the north.

28
°C maximum temperature
16
°C minimum temperature
broken clouds
9
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
8
kph wind from N

Allentown weather for Saturday 22nd August 2026

Expect isolated thunderstorms in Allentown, Pennsylvania with a maximum temperature of 26°C, 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 53% chance of some rain and a light breeze of 11 kph from the east.

26
°C maximum temperature
17
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
6
UV index (High)
53
% chance of some rain
<5
mm of rainfall expected
L
low heat & humidity
11
kph wind from E

Allentown weather for Sunday 23rd 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 7 hours of bright sunshine. There are 5-10 mm of rainfall expected with 66% chance of some rain and a gentle breeze of 14 kph from the west.