May weather forecast
Saint Peters, MO

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Weather in May

May presents an amalgamation of increased warmth and humidity in Saint Peters, Missouri. Marked increases in temperature and rising humidity levels characterize the advent of summer. This month stands out due to its peak temperature raising above 74.7°F (23.7°C) for the first time in the year. As daylight extends and sunshine becomes more prevalent, weather conditions become idyllic for outdoor pursuits. The weather patterns in May set the foundations for the hot summer weather that June carries forth.

Temperature

An increase in the average high-temperature marks May, moving from April's enjoyable 65.3°F (18.5°C) to a warm 74.7°F (23.7°C). In Saint Peters, the expected average low-temperature for May is a moderate 57°F (13.9°C).

Humidity

May is the most humid month, with an average relative humidity of 78%.

Rainfall

In May, the rain falls for 15.6 days. Throughout May, 2.44" (62mm) of precipitation is accumulated. Throughout the year, in Saint Peters, there are 133.4 rainfall days, and 20.98" (533mm) of precipitation is accumulated.

Snowfall

In Saint Peters, snow does not fall in April through October.

Daylight

In Saint Peters, the average length of the day in May is 14h and 19min.
On the first day of May, sunrise is at 6:03 am and sunset at 7:55 pm. On the last day of the month, sunrise is at 5:39 am and sunset at 8:21 pm CDT.

Sunshine

In May, the average sunshine in Saint Peters is 9.6h.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily high UV index of 6 during May translates into the following recommendations:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
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Frequently asked questions

What are the temperatures in Saint Peters in May?

In Saint Peters, in May, the average high-temperature is 74.7°F (23.7°C), and the average low-temperature is 57°F (13.9°C).

What is the most humid month in Saint Peters?

May is the most humid month, with an average relative humidity of 78%.

What is the average humidity in May in Saint Peters?

In May, the average relative humidity in Saint Peters, Missouri, is 78%.

How many days does it rain in May in Saint Peters?

In May, in Saint Peters, Missouri, the rain falls for 15.6 days. Throughout May, 2.44" (62mm) of precipitation is accumulated.

When it does not snow in Saint Peters?

April through October are months without snowfall.

What is the average length of the day in May in Saint Peters?

In May, the average day length is 14h and 19min.

When are sunrise and sunset in May in Saint Peters?

In May, on the first day of the month, sunrise is at 6:03 am and sunset at 7:55 pm. On the last day of the month, in Saint Peters, sunrise is at 5:39 am and sunset at 8:21 pm CDT.

How many hours of sunshine does Saint Peters have in May?

In May, the average sunshine duration in Saint Peters, Missouri, is 9.6h.

When is the highest UV index in Saint Peters?

The months with the highest UV index are May through August, with an average maximum UV index of 6.

What is the UV index intensity in May in Saint Peters?

In Saint Peters, the average daily maximum UV index in May is 6. A UV Index value of 6 to 7 symbolizes a high health threat from 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
Saint Peters, MO

Average temperature in May - Saint Peters, MO
  • Average high temperature in May: 74.7°F

The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is January (37.4°F).

  • Average low temperature in May: 57°F

The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (23.9°F).

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Average pressure in May
Saint Peters, MO

Average pressure in May - Saint Peters, MO
  • Average pressure in May: 29.95"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in May
Saint Peters, MO

Average wind speed in May - Saint Peters, MO
  • Average wind speed in May: 7.1mph

The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest month (with the lowest average wind speed) is July (5.5mph).

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Average humidity in May
Saint Peters, MO

Average humidity in May - Saint Peters, MO
  • Average humidity in May: 78%

The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in May
Saint Peters, MO

Average rainfall in May - Saint Peters, MO
  • Average rainfall in May: 2.44"

The wettest month (with the highest rainfall) is April (2.48").
The driest month (with the least rainfall) is February (1.06").

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Average rainfall days in May
Saint Peters, MO

Average rainfall days in May - Saint Peters, MO
  • Average rainfall days in May: 15.6 days

The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is February (6.7 days).

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Average snowfall in May
Saint Peters, MO

Average snowfall in May - Saint Peters, MO
  • Average snowfall in May: 0"

The month with the highest snowfall is February (1.65").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in May
Saint Peters, MO

Average snowfall days in May - Saint Peters, MO
  • Average snowfall days in May: 0 days

The months with the highest number of snowfall days are January and February (5.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in May /
Average sunshine in May
Saint Peters, MO

Average daylight in May / Average sunshine in May - Saint Peters, MO
  • Average daylight in May: 14h and 2min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in May: 9h and 4min

The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).

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Average sunshine days in May
Saint Peters, MO

Average sunshine days in May - Saint Peters, MO
  • Average sunshine days in May: 13 days

The month with the most sunshine days is January (20.4 days).
The month with the least sunshine days is July (12.7 days).

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Average UV index in May
Saint Peters, MO

Average UV index in May - Saint Peters, MO
  • Average UV index in May: 6

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in May
Saint Peters, MO

Average cloud cover in May - Saint Peters, MO
  • Average cloud cover in May: 36

The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in May
Saint Peters, MO

Average visibility in May - Saint Peters, MO
  • 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).

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Saint Peters, Missouri, USA

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