Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
Allentown (PA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Allentown.
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Climate overview of Allentown
The climate in Allentown, Pennsylvania, United States of America, is marked by large temperature swings across the seasons, ranging from 30°C (86°F) in July to 3°C (37°F) in January.
The city has a wet climate, receiving around 1294 mm (51 in) of rain/snowfall per year. Despite the high annual total, it has warm summers and cold winters. June is the wettest month.
Allentown Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Allentown - and find the best time to visit.
Monthly Temperature in Allentown
In Allentown, temperatures differ significantly between summer and winter months. On average, daytime temperatures range from a comfortable 30°C (86°F) in July to a chilly 3°C (37°F) in January.
Nighttime temperatures range from 19°C (66°F) in July to -6°C (21°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Allentown
Allentown experiences significant rain/snowfall throughout the year, averaging 1294 mm (51 in) of precipitation annually. The amount of precipitation varies moderately throughout the year. The wettest month, June, sees around 145 mm (5.7 in) of rainfall, perfect for those who enjoy a bit of rain now and then. The driest month, November, still receives a respectable 72 mm (2.8 in) of rainfall. For more details, please visit our Allentown Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Allentown
Daily percentage of sunshine
Humidity in Allentown by Month
The relative humidity is high throughout the year in Allentown.
The city experiences its highest humidity in September, reaching 74%. In April, the humidity drops to its lowest level at 61%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Allentown
Conditions in Allentown are generally most comfortable in May, June, August and September. They are typically least comfortable in January, February, March and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
cold
Feb
cold
Mar
cold
Apr
good
May
very good
Jun
very good
Jul
mixed
Aug
very good
Sep
very good
Oct
good
Nov
mixed
Dec
wet
- Best overall: May, June, August and September
- Warmest weather: July and August
- Fewest rainy days: February, March, September and November
- Seasonal pattern: Warm summers and cold winters
- Coldest conditions: January, with freezing nights around -6°C (21°F).
Frequently asked questions about the climate in Allentown
What is the best time to visit Allentown?
May, June, August and September typically offer the most optimal weather in Allentown. In contrast, January, February, March and December tend to have less optimal conditions. Allentown has warm summers and cold winters.
What temperatures can I expect in Allentown?
Daytime highs range from 3°C (37°F) in January to 30°C (86°F) in July. Nighttime lows range from -6°C (21°F) to 19°C (66°F). Temperatures vary considerably through the year.
How much rain does Allentown get?
Annual rainfall is around 1294 mm (51 in). June is the wettest month with 145 mm (5.7 in), while November is the driest with 72 mm (2.8 in).
Allentown 3-Day Forecast
Allentown on the map
Allentown is highlighted - select any city to see its climate.
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