The best times to visit Iselin for ideal weather are

April 16th to June 24th

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.

 

 


Other Iselin Travel Info

Weather in Iselin

Temperature

Average temperatures in Iselin vary drastically. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a fair chance of precipitation about half of the year. The area is less temperate than some — in the 32nd percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Iselin, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally mid July where highs are regularly around 89.9°F (32.2°C) with temperatures rarely dropping below 72.4°F (22.4°C) at night.

Iselin Temperatures (Fahrenheit)

Key
High
Average
Low

Iselin Temperatures (Celsius)

Key
High
Average
Low

“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Iselin Perceived Temperature (F)

Key
High
Average
Low

Iselin Perceived Temperature (C)

Key
High
Average
Low

 

Average Iselin Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 40.5 31.9 24.7
Feb 41.7 32.5 25
Mar 52.6 42.1 33.9
Apr 67.4 55 45.6
May 77.7 65.5 55.5
Jun 83.8 73.3 64.8
Jul 88.8 78.8 70.3
Aug 86 76.5 68.1
Sep 80 70 61.7
Oct 68.2 58.3 49.6
Nov 57.3 48 40.1
Dec 49.3 41.3 34.7

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 4.7 -0.1 -4.1
Feb 5.4 0.3 -3.9
Mar 11.4 5.6 1.1
Apr 19.7 12.8 7.6
May 25.4 18.6 13.1
Jun 28.8 22.9 18.2
Jul 31.6 26 21.3
Aug 30 24.7 20.1
Sep 26.7 21.1 16.5
Oct 20.1 14.6 9.8
Nov 14.1 8.9 4.5
Dec 9.6 5.2 1.5

 


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Iselin are April, August, and then October. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around mid October. For example, on the week of October 15th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in mid December with an average of 3 days of significant precipitation the week of December 17th.

When can you find snow in Iselin? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Iselin.

Key
Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Iselin (in).

Key
Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 15% 0 2.3
Feb 20% 0 2.6
Mar 19% 0 3.2
Apr 9% 0 1.3
May 15% 0 3.2
Jun 23% 0 4.1
Jul 13% 0 2.3
Aug 10% 0 1.5
Sep 12% 0 1.5
Oct 10% 0 1.3
Nov 12% 0 1.9
Dec 23% 0 3.6

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 15 0 5.8
Feb 20 0 6.6
Mar 19 0 8.1
Apr 9 0 3.3
May 15 0 8.1
Jun 23 0 10.4
Jul 13 0 5.8
Aug 10 0 3.8
Sep 12 0 3.8
Oct 10 0 3.3
Nov 12 0 4.8
Dec 23 0 9.1

 

Humidity and Wind

Iselin has some comfortably humid months, with slightly drier months on the other side of the year. The least humid month is April (41.5% relative humidity), and the most humid month is December (58.5%).

Wind in Iselin is usually calm. The windiest month is April, followed by February and March. April’s average wind speed of around 6.8 knots (7.8 MPH or 12.6 KPH) is considered “a light breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in mid February where average top sustained speeds reach 16.5 knots, which is considered a moderate breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Iselin.

Key
Avg. Relative Humidity

Wind

The graph below shows wind speed (max and average) in knots.

Key
Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 6.7 Light breeze 14 Significant breeze
Feb 6.8 Light breeze 14.6 Significant breeze
Mar 6.8 Light breeze 14 Significant breeze
Apr 6.8 Light breeze 14.8 Significant breeze
May 5.4 Light breeze 12.7 Significant breeze
Jun 5 Light breeze 12.1 Significant breeze
Jul 4.6 Light breeze 11.5 Significant breeze
Aug 4.2 Light breeze 11.1 Significant breeze
Sep 4.6 Light breeze 10.9 Significant breeze
Oct 5.1 Light breeze 12.2 Significant breeze
Nov 5.3 Light breeze 12.8 Significant breeze
Dec 5.9 Light breeze 13.5 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 47.3%
Feb 47.6%
Mar 45.2%
Apr 41.5%
May 51.2%
Jun 56.1%
Jul 52%
Aug 51.9%
Sep 56%
Oct 55.3%
Nov 51%
Dec 58.5%

 

Is it Safe to Travel to Iselin?

Our best data indicates this area is generally safe. As of Dec 04, 2023 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Dec 04, 2023.


 

The Busiest and Least Crowded Months

The busiest month for tourism in Iselin, NJ, US is July, followed by September and August. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Iselin in December. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month

 

Most Popular Months to Visit

Key
Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is slightly extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 83 in December means 83% of the tourists vs. July.

 

 

Overall Iselin Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderate. Highs range from 82.4°F (28°C) and 42.6°F (5.9°C) with far warmer temperatures in the later months. Rain is somewhat common with 3 to 6 days of significant precipitation per month. Spring is fairly slow for tourism, which makes it a good time for those looking for deals.

Summer (June through August)

The middle-year months have very comfortable weather with high temperatures that are quite warm. These months see moderate precipitation with 3 to 7 days of precipitation per month. June – August is the busiest season for tourism in Iselin, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 86.5°F (30.3°C) and 51°F (10.6°C), which will feel comfortable given the humidity and wind. It rains or snows a normal amount: 3 to 4 days per month. Tourism is the second busiest during these months due to the weather, so hotels may be slightly higher priced.

Winter (December through February)

Weather is far too cold this time of year in Iselin to be enjoyable for warm weather travelers. The average high during this season is between 50.8°F (10.4°C) and 37.3°F (2.9°C). On average, it rains or snows a fair amount: 5 to 7 times per month. These times of year are the slowest with tourists.

 

Best Times to Travel› the United States › Iselin, NJ, US