Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
The start of May signals an increase in the average high-temperature, moving from a moderate 58.3°F (14.6°C) in April to an agreeable 68.2°F (20.1°C). Throughout the month of May, Iselin observes an average nighttime temperature of 54°F (12.2°C).Humidity
In May, the average relative humidity is 76%.Rainfall
In May, the rain falls for 12.2 days. Throughout May, 0.94" (24mm) of precipitation is accumulated. Throughout the year, in Iselin, there are 110.2 rainfall days, and 8.9" (226mm) of precipitation is accumulated.Snowfall
In Iselin, New Jersey, snow does not fall in May through October.Daylight
In May, the average length of the day in Iselin is 14h and 28min.On the first day of the month, sunrise is at 5:55 am and sunset at 7:53 pm. On the last day of May, in Iselin, sunrise is at 5:28 am and sunset at 8:21 pm EDT.
Sunshine
In Iselin, the average sunshine in May is 8.8h.UV index
In May, the average daily maximum UV index in Iselin is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.Note: A maximum daily UV index of 5 during May morphs into the following directions:
Take necessary precautions - Suggestions to elude sunburn are provided. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in May in Iselin?
What is the average humidity in May in Iselin?
How many days does it rain in May in Iselin?
When it does not snow in Iselin?
Does it snow in Iselin in May?
How many hours of daylight does Iselin have in May?
When are sunrise and sunset in May in Iselin?
How long on average sun shines in May in Iselin?
What is the UV index reading in May in Iselin?
Average temperature in May
Iselin, NJ
- Average high temperature in May: 68.2°F
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (36.5°F).
- Average low temperature in May: 54°F
The month with the highest average low temperature is July (68.9°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure in May
Iselin, NJ
- Average pressure in May: 30.01"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in May
Iselin, NJ
- Average wind speed in May: 7.5mph
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 humidity in May
Iselin, NJ
- Average humidity in May: 76%
The month with the highest relative humidity is February (77%).
The month with the lowest relative humidity is August (72%).
Average rainfall in May
Iselin, NJ
- Average rainfall in May: 0.94"
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 in May
Iselin, NJ
- Average rainfall days in May: 12.2 days
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 in May
Iselin, NJ
- Average snowfall in May: 0"
The month with the highest snowfall is March (0.83").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Iselin, NJ
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (4.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Iselin, NJ
- Average daylight in May: 14h and 3min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in May: 8h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in May
Iselin, NJ
- Average sunshine days in May: 15.8 days
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 in May
Iselin, NJ
- Average UV index in May: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in May
Iselin, NJ
- Average cloud cover in May: 44
The months with the most cloud cover are February, March and December (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 30).
Average visibility in May
Iselin, NJ
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Iselin, New Jersey, USA
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