Mercer (PA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Mercer.
Climate overview of Mercer
Mercer, Pennsylvania, United States of America, sees big temperature differences between seasons, with July peaking at 28°C (82°F) and January dropping to 1°C (34°F).
With around 1161 mm (46 in) of annual rain/snowfall, Mercer has a notably wet climate. However, this rain/snowfall is not evenly distributed — the city has warm summers and very cold winters. The wettest month is June.
Mercer Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Mercer - and find the best time to visit.
Monthly Temperature in Mercer
Visitors to Mercer can expect significant temperature changes throughout the year. Average daytime temperatures reach a comfortable 28°C (82°F) in July. In January, the coolest month of the year, temperatures drop to a very cold 1°C (34°F).
At night, temperatures range from around 15°C (59°F) in July to -9°C (16°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Mercer
Mercer is known for its substantial rain/snowfall, with annual precipitation reaching 1161 mm (46 in). Mercer experiences moderate seasonal variation in rainfall, with monthly averages ranging from 126 mm (5 in) in June, the wettest month, and 71 mm (2.8 in) in February, the driest month. For more details, please visit our Mercer Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Mercer
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: September
- Warmest weather: July and August
- Fewest rainy days: March, August, September and November
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -9°C (16°F).
Frequently asked questions about the climate in Mercer
What is the best time to visit Mercer?
September typically offers the most optimal weather in Mercer. In contrast, January, February, March, November and December tend to have less optimal conditions. Mercer has warm summers and very cold winters.
What temperatures can I expect in Mercer?
Daytime highs range from 1°C (34°F) in January to 28°C (82°F) in July. Nighttime lows range from -9°C (16°F) to 15°C (59°F). Temperatures vary considerably through the year.
How much rain does Mercer get?
Annual rainfall is around 1161 mm (46 in). June is the wettest month with 126 mm (5 in), while February is the driest with 71 mm (2.8 in).
Mercer 3-Day Forecast
Mercer (PA) 3-Day Forecast
Mercer on the map
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