May weather forecast and climate
Rochester, NY

Amazing High Falls in Rochester, New York, USA
Amazing High Falls in Rochester, New York, USA

Weather in May

May, the last month of the spring, in Rochester, is an enjoyable month, with average temperature fluctuating between 48°F (8.9°C) and 63.9°F (17.7°C).

Temperature

In May, the average high-temperature rises, from a cool 51.4°F (10.8°C) in April, to an enjoyable 63.9°F (17.7°C). In Rochester, in May, the average low-temperature is 48°F (8.9°C).

Humidity

In Rochester, New York, the average relative humidity in May is 78%.

Rainfall

The month with the most rainfall is May when the rain falls for 16.8 days and typically aggregates up to 2.99" (76mm) of precipitation.

Snowfall

Months with snowfall in Rochester are January through May, October through December. May is the last month it regularly snows. During 0.4 snowfall days, Rochester aggregates 0.35" (9mm) of snow. Throughout the year, in Rochester, there are 70.9 snowfall days, and 27.44" (697mm) of snow is accumulated.

Ocean temperature

In Rochester, New York, the average seawater temperature is 42.6°F (5.9°C).
Note: Swimming in 42.6°F (5.9°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.

Daylight

The average length of the day in Rochester is 14.7h.

Sunshine

The average sunshine in Rochester is 9.3h.

UV index

In Rochester, the average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to the UV radiation for the average person.
Note: In May, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in May in Rochester?

In May, the average relative humidity in Rochester is 78%.

What is the wettest month in Rochester?

The month with the most rainfall in Rochester is May when the rain falls for 16.8 days and typically aggregates up to 2.99" (76mm) of precipitation.

How many days does it rain in May in Rochester?

In Rochester, New York, during May, the rain falls for 16.8 days and regularly aggregates up to 2.99" (76mm) of precipitation.

What is the last month it snows in Rochester?

May is the last month it regularly snows. During 0.4 snowfall days, in May, Rochester aggregates 0.35" (9mm) of snow.

How cold is the water in May in Rochester?

In Rochester, New York, in May, the average water temperature is 42.6°F (5.9°C). Swimming in 42.6°F (5.9°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

How many hours of daylight does Rochester have in May?

In Rochester, the average length of the day in May is 14.7h.

How long on average sun shines in May in Rochester?

In May, the average sunshine in Rochester, New York, is 9.3h.

How high is the UV index in May in Rochester?

The average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in May
Rochester, NY

Average temperature in May - Rochester, NY
  • Average high temperature in May: 63.9°F

The warmest month (with the highest average high temperature) is July (77.9°F).
The month with the lowest average high temperature is January (29.3°F).

  • Average low temperature in May: 48°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).

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Average pressure in May
Rochester, NY

Average pressure in May - Rochester, NY
  • Average pressure in May: 29.98"

The month with the highest atmospheric pressure is November (30.09").
The month with the lowest atmospheric pressure is June (29.92").

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Average wind speed in May
Rochester, NY

Average wind speed in May - Rochester, NY
  • Average wind speed in May: 8mph

The windiest month (with the highest average wind speed) is January (11.6mph).
The calmest month (with the lowest average wind speed) is July (7mph).

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Average humidity in May
Rochester, NY

Average humidity in May - Rochester, NY
  • Average humidity in May: 78%

Months with the highest relative humidity are January and February (84%).
Months with the lowest relative humidity are August and September (76%).

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Average rainfall in May
Rochester, NY

Average rainfall in May - Rochester, NY
  • Average rainfall in May: 2.99"

The wettest month (with the highest rainfall) is May (2.99").
The driest month (with the least rainfall) is September (1.85").

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Average rainfall days in May
Rochester, NY

Average rainfall days in May - Rochester, NY
  • Average rainfall days in May: 16.8 days

The month with the highest number of rainy days is August (18.7 days).
The month with the least rainy days is February (7.8 days).

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Average snowfall in May
Rochester, NY

Average snowfall in May - Rochester, NY
  • Average snowfall in May: 0.35"

The month with the highest snowfall is February (7.01").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in May
Rochester, NY

Average snowfall days in May - Rochester, NY
  • Average snowfall days in May: 0.4 days

The month with the highest number of snowfall days is January (17.6 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in May
Rochester, NY

Average sea temperature in May - Rochester, NY
  • Average sea temperature in May: 42.7°F

The best month for swimming (with the highest average sea temperature) is August (73°F).
The coldest month (with the lowest average sea temperature) is March (35.8°F).

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Average daylight in May /
Average sunshine in May
Rochester, NY

Average daylight in May / Average sunshine in May - Rochester, NY
  • Average daylight in May: 14.7h

The month with the longest days is June (Average daylight: 15.3h).
The month with the shortest days is December (Average daylight: 9h).

  • Average sunshine in May: 9.3h

The month with the most sunshine is July (Average sunshine: 10.6h).
Months with the least sunshine are January and February (Average sunshine: 2.7).

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Average sunshine days in May
Rochester, NY

Average sunshine days in May - Rochester, NY
  • Average sunshine days in May: 12.6 days

The month with the most sunshine days is September (13.9 days).
The month with the least sunshine days is February (6.7 days).

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Average UV index in May
Rochester, NY

Average UV index in May - Rochester, NY
  • Average UV index in May: 5

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in May
Rochester, NY

Average cloud cover in May - Rochester, NY
  • Average cloud cover in May: 39

The month with the most cloud cover is January (Cloud cover 74).
The month with the least cloud cover is August (Cloud cover 28).

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Average visibility in May
Rochester, NY

Average visibility in May - Rochester, NY
  • Average visibility in May: 6mi

Months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January and February (5mi).

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