UTC Offset
UTC-04:00
Iselin, United States Snapshot 2026
Where is Iselin?
Iselin, United States
- Continent
- Americas
- Country
- United States
- City
- Iselin
- Population
- 18.7K
- Elevation
- 19 m
- Coordinates
- 40.58°, -74.32°
Iselin is a city in United States with a population of approximately 18.7K. Average temperatures range from -2°C (28°F) in January to 30°C (86°F) in July. The best time to visit is May, June, August, September.
Time in Iselin right now
Open full time & time zone page 13:48 48
Monday, June 15, 2026
IANA time zone
America/New_York
Daylight saving
DST in effect
EST / EDT
Next DST change
November 1
backward -1h
Live weather in Iselin
Daylight in Iselin today
View full sunrise & sunset page Sunrise
Sunset
Day length
15h 04m
Climate normals for Iselin
Long-term monthly averages based on historical data.
January
Poor 
February
Poor March
Poor April
Fair May best
Excellent June best
Excellent July
Good August best
Excellent September best
Excellent October
Good November
Fair December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 5°C / -2°C | 1°C / -7°C | 10days (84 mm) Wet | 6h Fair | 67% Muggy | 2.4 Moderate | Poor | View Details |
| February | 7°C / -1°C | 3°C / -6°C | 9days (90 mm) Wet | 6.6h Fair | 69% Muggy | 3.4 Moderate | Poor | View Details |
| March | 11°C / 2°C | 8°C / -2°C | 10days (102 mm) Wet | 8h Good | 66% Muggy | 4.6 Moderate | Poor | View Details |
| April | 17°C / 7°C | 15°C / 4°C | 11days (101 mm) Wet | 8.7h Good | 67% Muggy | 5.3 High | Fair | View Details |
| May best | 22°C / 12°C | 21°C / 11°C | 12days (104 mm) Wet | 9.2h Good | 72% Muggy | 6.2 High | Excellent | View Details |
| June best | 27°C / 18°C | 28°C / 18°C | 11days (82 mm) Wet | 11.1h Excellent | 70% Muggy | 6.9 High | Excellent | View Details |
| July | 30°C / 22°C | 33°C / 24°C | 14days (129 mm) Wet | 11.4h Excellent | 72% Muggy | 7.3 Very High | Good | View Details |
| August best | 29°C / 20°C | 31°C / 22°C | 12days (97 mm) Wet | 10.3h Excellent | 73% Muggy | 6.6 High | Excellent | View Details |
| September best | 25°C / 17°C | 26°C / 17°C | 9days (90 mm) Wet | 8.5h Good | 74% Muggy | 5 Moderate | Excellent | View Details |
| October | 19°C / 12°C | 18°C / 10°C | 9days (99 mm) Wet | 7.3h Good | 73% Muggy | 4.2 Moderate | Good | View Details |
| November | 12°C / 5°C | 9°C / 1°C | 8days (74 mm) Wet | 7h Good | 69% Muggy | 2.9 Moderate | Fair | View Details |
| December | 7°C / 0°C | 3°C / -4°C | 10days (98 mm) Wet | 5.7h Fair | 72% Muggy | 2.1 Moderate | Poor | View Details |
Monthly Temperatures
HighLow
Line chart showing monthly temperatures. Jan: 5°C / -2°C . Feb: 7°C / -1°C . Mar: 11°C / 2°C . Apr: 17°C / 7°C . May: 22°C / 12°C . Jun: 27°C / 18°C . Jul: 30°C / 22°C . Aug: 29°C / 20°C . Sep: 25°C / 17°C . Oct: 19°C / 12°C . Nov: 12°C / 5°C . Dec: 7°C / 0°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 84 mm. Feb: 90 mm. Mar: 102 mm. Apr: 101 mm. May: 104 mm. Jun: 82 mm. Jul: 129 mm. Aug: 97 mm. Sep: 90 mm. Oct: 99 mm. Nov: 74 mm. Dec: 98 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 67%. Feb: 69%. Mar: 66%. Apr: 67%. May: 72%. Jun: 70%. Jul: 72%. Aug: 73%. Sep: 74%. Oct: 73%. Nov: 69%. Dec: 72%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 19 km/h . Feb: 19 km/h . Mar: 21 km/h . Apr: 20 km/h . May: 17 km/h . Jun: 16 km/h . Jul: 14 km/h . Aug: 14 km/h . Sep: 15 km/h . Oct: 17 km/h . Nov: 18 km/h . Dec: 18 km/h .
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 3°C . Feb: 4°C . Mar: 7°C . Apr: 11°C . May: 17°C . Jun: 23°C . Jul: 28°C . Aug: 27°C . Sep: 24°C . Oct: 18°C . Nov: 11°C . Dec: 5°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 3. Mar: UV 5. Apr: UV 5. May: UV 6. Jun: UV 7. Jul: UV 7. Aug: UV 7. Sep: UV 5. Oct: UV 4. Nov: UV 3. Dec: UV 2.
Frequently Asked Questions
Iselin has a population of approximately 18.7K.
The best months to visit Iselin are May, June, August, September, when temperatures are pleasant and rainfall is lower.
Iselin receives approximately 1150mm of rainfall annually across 125 rainy days.
Iselin is located in United States, in the Americas region.
Iselin sits at an elevation of 19 m (62 ft) above sea level.