Monthly weather forecast and climate
Iselin, NJ

January, like December, in Iselin, New Jersey, is another cold winter month, with average temperature ranging between min 25.7°F (-3.5°C) and max 36.5°F (2.5°C). The coldest month is January, with an average high-temperature of 36.5°F (2.5°C) and an average low-temperature of 25.7°F (-3.5°C). Weather in January »

February, the last month of the winter, in Iselin, is also a wintry month, with average temperature ranging between max 39.2°F (4°C) and min 27.3°F (-2.6°C). In Iselin, the average high-temperature is almost the same as in January - a still wintry 39.2°F (4°C). Weather in February »

March, the first month of the spring, in Iselin, is a chilly month, with average temperature varying between 34.3°F (1.3°C) and 46.9°F (8.3°C). In Iselin, the average high-temperature marginally rises, from a wintry 39.2°F (4°C) in February, to a frosty 46.9°F (8.3°C). Weather in March »

April is a mild spring month in Iselin, New Jersey, with average temperature fluctuating between 44.1°F (6.7°C) and 58.3°F (14.6°C). In Iselin, the average high-temperature rises, from a frosty 46.9°F (8.3°C) in March, to a moderate 58.3°F (14.6°C). Weather in April »

May, the last month of the spring, in Iselin, is a pleasant month, with average temperature varying between 54°F (12.2°C) and 68.2°F (20.1°C). In Iselin, the average high-temperature in May rises, from a mild 58.3°F (14.6°C) in April, to a pleasant 68.2°F (20.1°C). Weather in May »

The first month of the summer, June, is a warm month in Iselin, New Jersey, with average temperature ranging between min 62.1°F (16.7°C) and max 76.8°F (24.9°C). In June, the average high-temperature marginally rises, from a pleasant 68.2°F (20.1°C) in May, to a moderately hot 76.8°F (24.9°C). Weather in June »

July, the same as June, is another warm summer month in Iselin, New Jersey, with average temperature fluctuating between 68.9°F (20.5°C) and 83.1°F (28.4°C). July is the warmest month, with an average high-temperature of 83.1°F (28.4°C) and an average low-temperature of 68.9°F (20.5°C). The average heat index in July is estimated at a tropical 89.4°F (31.9°C). Weather in July »

The last month of the summer, August, is another warm month in Iselin, New Jersey, with average temperature fluctuating between 68.4°F (20.2°C) and 81.9°F (27.7°C). In August, the average high-temperature is almost the same as in July - a still moderately hot 81.9°F (27.7°C). Weather in August »

September, the first month of the autumn, in Iselin, is also a moderately hot month, with average temperature varying between 61.2°F (16.2°C) and 75.2°F (24°C). In Iselin, the average high-temperature marginally drops, from 81.9°F (27.7°C) in August, to a still warm 75.2°F (24°C). Weather in September »

October, the same as September, is another enjoyable autumn month in Iselin, New Jersey, with average temperature fluctuating between 50.9°F (10.5°C) and 63.3°F (17.4°C). In October, the average high-temperature decreases, from a warm 75.2°F (24°C) in September, to an enjoyable 63.3°F (17.4°C). Weather in October »

November, the last month of the autumn, in Iselin, is also a fresh month, with average temperature fluctuating between 51.3°F (10.7°C) and 39.7°F (4.3°C). In Iselin, the average high-temperature drops, from an enjoyable 63.3°F (17.4°C) in October, to a cool 51.3°F (10.7°C). Weather in November »

December, the first month of the winter, in Iselin, is also a wintry month, with average temperature varying between 32.9°F (0.5°C) and 42.4°F (5.8°C). In December, the average high-temperature slightly decreases, from a cool 51.3°F (10.7°C) in November, to a cold 42.4°F (5.8°C). Weather in December »

What is the coldest month in Iselin?

With an average high-temperature of 36.5°F (2.5°C) and an average low-temperature of 25.7°F (-3.5°C), January is the coldest month in Iselin.

How many days does it rain in Iselin?

Throughout the year, there are 110.2 rainfall days, and 8.9" (226mm) of precipitation is accumulated.

When does it snow in Iselin?

January through April, November and December are months with snowfall.

How many days does it snow in Iselin?

Throughout the year, there are 14.5 snowfall days, and 1.85" (47mm) of snow is accumulated.

What is the month with the lowest UV index in Iselin?

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the most humid month in Iselin?

With an average relative humidity of 77%, February is the most humid month in Iselin.

What is the month with the least sunshine in Iselin?

February has the least sunshine of the year in Iselin, New Jersey, with an average of 4.7h of sunshine.

What is the snowiest month in Iselin?

March is the month with the most snowfall in Iselin, New Jersey. Snow falls for 3 days and accumulates 0.83" (21mm) of snow.

When it does not snow in Iselin?

May through October are months without snowfall.

When are the longest days in Iselin?

June has the longest days of the year, with an average of 15h of daylight.

What are the months with the highest UV index in Iselin?

Months with the highest UV index in Iselin are June through August, with an average maximum UV index of 6.

What is the warmest month in Iselin?

July is the warmest month, with an average high-temperature of 83.1°F (28.4°C) and an average low-temperature of 68.9°F (20.5°C).

What is the rainiest month in Iselin?

July is the month with the most rainfall in Iselin. Rain falls for 12.7 days and accumulates 1.22" (31mm) of precipitation.

What month has the most sunshine in Iselin?

July has the most sunshine of the year, with an average of 10.6h of sunshine.

What is the least humid month in Iselin?

The least humid month in Iselin, New Jersey, is August, with an average relative humidity of 72%.

What is the driest month in Iselin?

September is the month with the least rainfall. Rain falls for 9.6 days and accumulates 0.39" (10mm) of precipitation.

What is the month with the shortest days in Iselin?

The month with the shortest days in Iselin, New Jersey, is December, with an average of 9.3h of daylight.
Average temperature - Iselin, NJ
Average pressure - Iselin, NJ

The month with the highest atmospheric pressure is November (30.11").
The month with the lowest atmospheric pressure is June (29.93").

Average wind speed - Iselin, NJ

The windiest months (with the highest average wind speed) are January and March (9.6mph).
The calmest month (with the lowest average wind speed) is July (6.3mph).

Average rainfall - Iselin, NJ

The wettest month (with the highest rainfall) is July (1.22").
The driest month (with the least rainfall) is September (0.39").

Average rainfall days - Iselin, NJ

The month with the highest number of rainy days is July (12.7 days).
The month with the least rainy days is January (4.9 days).

Average snowfall - Iselin, NJ
Average snowfall days - Iselin, NJ

The month with the highest number of snowfall days is February (4.2 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight / Average sunshine - Iselin, NJ

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.3h).

The month with the most sunshine is July (Average sunshine: 10.6h).
The month with the least sunshine is February (Average sunshine: 4.7h).

Average sunshine days - Iselin, NJ

The month with the most sunshine days is January (22.6 days).
The month with the least sunshine days is July (14.8 days).

Average UV index - Iselin, NJ
Average visibility - Iselin, NJ

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).