May weather forecast
Watertown, WI

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Weather in May

May raises the curtain for the summer season in Watertown by extending the warmth of April. Outdoor activities become more possible with the weather growing increasingly pleasant. A leap in temperature is evident as the range shifts from 47.8°F (8.8°C) to 65.8°F (18.8°C). May's longer daylight hours invite the residents to bask in the sun's glow and explore the city's grandeur. Still, an umbrella becomes a necessary accessory as rainfall becomes more frequent.

Temperature

In Watertown, stepping into May brings a temperature increase, moving up from April's cool 53.2°F (11.8°C) to a comfortable 65.8°F (18.8°C). Watertown in May experiences a low-temperature average of 47.8°F (8.8°C).

Humidity

In May, the average relative humidity is 79%.

Rainfall

In Watertown, in May, during 14.4 rainfall days, 1.3" (33mm) of precipitation is typically accumulated. In Watertown, Wisconsin, during the entire year, the rain falls for 113.9 days and collects up to 11.57" (294mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. May is the last month it regularly snows. During 0.2 snowfall days, in May, Watertown aggregates 0.04" (1mm) of snow. In Watertown, Wisconsin, during the entire year, snow falls for 45 days and aggregates up to 5.51" (140mm) of snow.

Daylight

In Watertown, Wisconsin, the average length of the day in May is 14h and 42min.
On the first day of the month, sunrise is at 5:47 am and sunset at 7:56 pm. On the last day of May, sunrise is at 5:17 am and sunset at 8:27 pm CDT.

Sunshine

In Watertown, the average sunshine in May is 8.6h.

UV index

May through August, with an average maximum UV index of 5, are months with the highest UV index. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for average individuals.
Note: In May, the maximum UV index of 5 suggests these recommendations:
Put precautions into practice - Protective measures against sun-induced damage are advised. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.

Frequently asked questions

What is the average May temperature in Watertown?

During May, Watertown experiences an average high-temperature of 65.8°F (18.8°C) and a low-temperature of 47.8°F (8.8°C).

What is the average humidity in May in Watertown?

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

How many days does it rain in May in Watertown?

In Watertown, Wisconsin, in May, during 14.4 rainfall days, 1.3" (33mm) of precipitation is typically accumulated.

What is the last month it snows in Watertown?

May is the last month it regularly snows in Watertown. During 0.2 snowfall days, in May, Watertown aggregates 0.04" (1mm) of snow.

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

In May, the average day length in Watertown is 14h and 42min.

What time are sunrise and sunset in May in Watertown?

In May, on the first day of the month, sunrise is at 5:47 am and sunset at 7:56 pm. On the last day of the month, in Watertown, sunrise is at 5:17 am and sunset at 8:27 pm CDT.

How long on average sun shines in May in Watertown?

In May, the average sunshine duration in Watertown, Wisconsin, is 8.6h.

When is the highest UV index in Watertown?

The months with the highest UV index are May through August, with an average maximum UV index of 5.

What is the UV index intensity in May in Watertown?

In Watertown, the average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Watertown, WI

Average temperature in May - Watertown, WI
  • Average high temperature in May: 65.8°F

The warmest month (with the highest average high temperature) is July (78.6°F).
The month with the lowest average high temperature is January (23.7°F).

  • Average low temperature in May: 47.8°F

The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (11.7°F).

Average pressure in May
Watertown, WI

Average pressure in May - Watertown, WI
  • Average pressure in May: 29.96"Hg

The months with the highest atmospheric pressure are January and February (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in May
Watertown, WI

Average wind speed in May - Watertown, WI
  • Average wind speed in May: 8.6mph

The windiest month (with the highest average wind speed) is April (10mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).

Average humidity in May
Watertown, WI

Average humidity in May - Watertown, WI
  • Average humidity in May: 79%

The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is April (76%).

Average rainfall in May
Watertown, WI

Average rainfall in May - Watertown, WI
  • Average rainfall in May: 1.3"

The wettest month (with the highest rainfall) is July (1.54").
The driest months (with the least rainfall) are February and December (0.47").

Average rainfall days in May
Watertown, WI

Average rainfall days in May - Watertown, WI
  • Average rainfall days in May: 14.4 days

The month with the highest number of rainy days is May (14.4 days).
The month with the least rainy days is February (3 days).

Average snowfall in May
Watertown, WI

Average snowfall in May - Watertown, WI
  • Average snowfall in May: 0.04"

The month with the highest snowfall is January (1.61").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in May
Watertown, WI

Average snowfall days in May - Watertown, WI
  • Average snowfall days in May: 0.2 days

The month with the highest number of snowfall days is January (12.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in May /
Average sunshine in May
Watertown, WI

Average daylight in May / Average sunshine in May - Watertown, WI
  • Average daylight in May: 14h and 4min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in May: 8h and 4min

The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).

Average sunshine days in May
Watertown, WI

Average sunshine days in May - Watertown, WI
  • Average sunshine days in May: 14.2 days

The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is July (12.4 days).

Average UV index in May
Watertown, WI

Average UV index in May - Watertown, WI
  • Average UV index in May: 5

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).

Average cloud cover in May
Watertown, WI

Average cloud cover in May - Watertown, WI
  • Average cloud cover in May: 43

The month with the most cloud cover is January (Cloud cover 65).
The months with the least cloud cover are July, August and September (Cloud cover 34).

Average visibility in May
Watertown, WI

Average visibility in May - Watertown, WI
  • Average visibility in May: 6mi

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

Watertown, Wisconsin, USA

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