Allentown weather live forecast

Today's maximum temperature in Allentown is expected to be 22°C. Select a day from the live weather forecast for Allentown, Pennsylvania, USA for more weather parameters.

Sunday
20th Sep
22

17

0

1
Monday
21st Sep
20

15

4

5
Tuesday
22nd Sep
16

12

0

1
Wednesday
23rd Sep
17

12

0

3
Thursday
24th Sep
18

11

0

6

5-day weather forecast updated at 04:01 on Sunday 20th 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 Sunday 20th September 2026

Expect isolated thunderstorms in Allentown, Pennsylvania with a maximum temperature of 22°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 20-30 mm of rainfall expected with 98% chance of some rain and a light breeze of 12 kph from the south-east.

22
°C maximum temperature
17
°C minimum temperature
isolated thunderstorms
0
hours of sunshine
1
UV index (Low)
98
% chance of some rain
<30
mm of rainfall expected
22
°C wind chill
12
kph wind from SE

Allentown weather for Monday 21st September 2026

Expect broken clouds in Allentown, Pennsylvania with a maximum temperature of 20°C, maximum UV of 5 (Moderate) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the north-east.

20
°C maximum temperature
15
°C minimum temperature
broken clouds
4
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
13
kph wind from NE

Allentown weather for Tuesday 22nd September 2026

Expect mostly cloudy with rain in Allentown, Pennsylvania with a maximum temperature of 16°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 68% chance of some rain and a gentle breeze of 15 kph from the north-east.

16
°C maximum temperature
12
°C minimum temperature
mostly cloudy with rain
0
hours of sunshine
1
UV index (Low)
68
% chance of some rain
<10
mm of rainfall expected
0
no heat & humidity
15
kph wind from NE

Allentown weather for Wednesday 23rd September 2026

Expect mostly cloudy with light rain in Allentown, Pennsylvania with a maximum temperature of 17°C, maximum UV of 3 (Moderate) and no hours of bright sunshine. There are 0-2 mm of rainfall expected with 22% chance of some rain and a gentle breeze of 18 kph from the north-east.

17
°C maximum temperature
12
°C minimum temperature
mostly cloudy with light rain
0
hours of sunshine
3
UV index (Moderate)
22
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
18
kph wind from NE

Allentown weather for Thursday 24th September 2026

Expect overcast skies in Allentown, Pennsylvania with a maximum temperature of 18°C, maximum UV of 6 (High) and no hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 16 kph from the north-east.