South Plainfield (NJ) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit South Plainfield.
Climate overview of South Plainfield
Temperatures in South Plainfield, New Jersey, United States of America, vary greatly throughout the year. July is the hottest month at 31°C (88°F), while January is the coldest at 5°C (41°F).
The city has a wet climate, receiving around 1227 mm (48 in) of rain/snowfall per year. Despite the high annual total, it has very warm summers and cold winters. June is the wettest month. July is the sunniest month, averaging 9.0 hours of sunshine per day.
South Plainfield Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in South Plainfield - and find the best time to visit.
Monthly Temperature in South Plainfield
The climate in South Plainfield is known for significant temperature differences throughout the year, making the weather dynamic. On average, daytime temperatures range from a very warm 31°C (88°F) in July to a chilly 5°C (41°F) in January.
Nighttime temperatures range from 19°C (66°F) in July to -5°C (23°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in South Plainfield
South Plainfield has a notably wet climate with abundant precipitation, recording 1227 mm (48 in) of rain/snowfall per year. The amount of precipitation varies moderately throughout the year. The wettest month, June, sees around 125 mm (4.9 in) of rainfall, perfect for those who enjoy a bit of rain now and then. The driest month, November, still receives a respectable 76 mm (3 in) of rainfall. For more details, please visit our South Plainfield 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 South Plainfield
In South Plainfield, summer days are longer and more sunny, with daily sunshine hours peaking at 9.0 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 4.7 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in South Plainfield by Month
The relative humidity is high throughout the year in South Plainfield.
The city experiences its highest humidity in September, reaching 68%. In April, the humidity drops to its lowest level at 55%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit South Plainfield
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May and September
- Warmest weather: July and August
- Most sunshine: May, June, July and August
- Fewest rainy days: February, March, September and November
- Seasonal pattern: Very warm summers and cold winters
- Coldest conditions: January, with freezing nights around -5°C (23°F).
Frequently asked questions about the climate in South Plainfield
What is the best time to visit South Plainfield?
May and September typically offer the most optimal weather in South Plainfield. In contrast, January, February, March and December tend to have less optimal conditions. South Plainfield has very warm summers and cold winters.
What temperatures can I expect in South Plainfield?
Daytime highs range from 5°C (41°F) in January to 31°C (88°F) in July. Nighttime lows range from -5°C (23°F) to 19°C (66°F). Temperatures vary considerably through the year.
How much rain does South Plainfield get?
Annual rainfall is around 1227 mm (48 in). June is the wettest month with 125 mm (4.9 in), while November is the driest with 76 mm (3 in).
How sunny is South Plainfield?
South Plainfield receives around 2,544 hours of sunshine per year. July is the sunniest month with 271 hours, while December is the cloudiest with just 141 hours. Overall, South Plainfield enjoys abundant sunshine.
South Plainfield 3-Day Forecast
South Plainfield on the map
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