Jamestown
Rhode Island, USA
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
Jamestown, RI

May, the last month of the spring, in Jamestown, is a comfortable month, with average temperature varying between 50.7°F (10.4°C) and 62.6°F (17°C).

Temperature

In Jamestown, the average high-temperature increases, from a cool 53.2°F (11.8°C) in April, to a comfortable 62.6°F (17°C). In May, in Jamestown, the average low-temperature is 50.7°F (10.4°C).

Humidity

In May, the average relative humidity in Jamestown is 79%.

Rainfall

In Jamestown, during 14.8 rainfall days, 2.09" (53mm) of precipitation is typically accumulated. Throughout the year, in Jamestown, there are 148.1 rainfall days, and 29.65" (753mm) of precipitation is accumulated.

Snowfall

January through March, May, November and December are months with snowfall in Jamestown. May is the first month it typically snows. Throughout May, in the average 0.2 snowfall days, it receives 0.08" (2mm) of snow. Throughout the year, there are 22.9 snowfall days, and 8.78" (223mm) of snow is accumulated.

Ocean temperature

In Jamestown, in May, the average water temperature is 51.6°F (10.9°C).
Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

The average length of the day in May is 14.5h.

Sunshine

In May, the average sunshine is 8.5h.

UV index

In Jamestown, Rhode Island, the average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to the Sun's UV rays for the average person.
Note: In May, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in May in Jamestown?

In May, in Jamestown, the average high-temperature is 62.6°F (17°C), and the average low-temperature is 50.7°F (10.4°C).

What is the average humidity in May in Jamestown?

In May, the average relative humidity in Jamestown is 79%.

How many days does it rain in May in Jamestown?

In May, in Jamestown, Rhode Island, the rain falls for 14.8 days. Throughout May, 2.09" (53mm) of precipitation is accumulated.

When does it start snowing in Jamestown?

May is the first month it typically snows in Jamestown. Throughout May, in the average 0.2 snowfall days, it receives 0.08" (2mm) of snow.

What is the ocean temperature in May in Jamestown?

In May, the average ocean temperature is 51.6°F (10.9°C). Swimming in 51.6°F (10.9°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the average length of the day in May in Jamestown?

In May, the average length of the day in Jamestown, Rhode Island, is 14.5h.

How long on average sun shines in May in Jamestown?

In Jamestown, Rhode Island, the average sunshine in May is 8.5h.

How high is the UV index in May in Jamestown?

In Jamestown, the average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV radiation.
Average temperature in May - Jamestown, RI
  • Average high temperature in May: 62.6°F

The warmest month (with the highest average high temperature) is July (78.3°F).
The month with the lowest average high temperature is January (36.1°F).

  • Average low temperature in May: 50.7°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).

Average humidity in May - Jamestown, RI
  • Average humidity in May: 79%

The month with the highest relative humidity is June (81%).
The month with the lowest relative humidity is March (73%).

Average rainfall in May - Jamestown, RI
  • Average rainfall in May: 2.09"

The wettest month (with the highest rainfall) is October (3.27").
The driest month (with the lowest rainfall) is September (1.42").

Average rainfall days in May - Jamestown, RI
  • Average rainfall days in May: 14.8 days

The month with the highest number of rainy days is April (15.6 days).
The month with the lowest number of rainy days is January (8.3 days).

Average snowfall in May - Jamestown, RI
  • Average snowfall in May: 0.08"

The month with the highest snowfall is February (2.76").
Months with the lowest snowfall are April, June, July, August, September and October (0").

Average snowfall days in May - Jamestown, RI
  • Average snowfall days in May: 0.2 days

The month with the highest number of snowfall days is January (6.6 days).
Months with the lowest number of snowfall days are June, July, August, September and October (0 days).

Average sea temperature in May - Jamestown, RI
  • Average sea temperature in May: 51.5°F

The best month for swimming (with the highest average sea temperature) is August (69.6°F).
The coldest month (with the lowest average sea temperature) is February (38.1°F).

Average daylight in May / Average sunshine in May - Jamestown, RI
  • Average daylight in May: 14.5h

The month with the longest days is June (Average daylight: 15.1h).
The month with shortest days is December (Average daylight: 9.2h).

  • Average sunshine in May: 8.5h

The month with most sunshine is August (Average sunshine: 10.5h).
The month with least sunshine is February (Average sunshine: 4.8h).

Average UV index in May - Jamestown, RI
  • Average UV index in May: 5

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, March and December (UV index 2).