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.

Friday
18th Sep
28

17

6

7
Saturday
19th Sep
22

14

2

6
Sunday
20th Sep
22

16

0

1
Monday
21st Sep
21

16

1

1
Tuesday
22nd Sep
16

12

1

1

5-day weather forecast updated at 04:01 on Friday 18th 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 Friday 18th September 2026

Expect broken clouds in Allentown, Pennsylvania with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 7 (High) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the north.

28
°C maximum temperature
17
°C minimum temperature
broken clouds
6
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
L
low heat & humidity
12
kph wind from N

Allentown weather for Saturday 19th September 2026

Expect broken clouds in Allentown, Pennsylvania with a maximum temperature of 22°C, maximum UV of 6 (High) and 2 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the south-east.

22
°C maximum temperature
14
°C minimum temperature
broken clouds
2
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
22
°C wind chill
10
kph wind from SE

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 95% chance of some rain and a light breeze of 11 kph from the south-east.

22
°C maximum temperature
16
°C minimum temperature
isolated thunderstorms
0
hours of sunshine
1
UV index (Low)
95
% chance of some rain
<30
mm of rainfall expected
22
°C wind chill
11
kph wind from SE

Allentown weather for Monday 21st September 2026

Expect mostly cloudy with light rain in Allentown, Pennsylvania with a maximum temperature of 21°C, maximum UV of 1 (Low) and 1 hour of bright sunshine. There are 0-2 mm of rainfall expected with 48% chance of some rain and a light breeze of 12 kph from the north-east.

21
°C maximum temperature
16
°C minimum temperature
mostly cloudy with light rain
1
hour of sunshine
1
UV index (Low)
48
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
12
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 1 hour of bright sunshine. There are 5-10 mm of rainfall expected with 60% chance of some rain and a gentle breeze of 16 kph from the north-east.