May weather forecast
Houston, TX

A beautiful park in Root square overlooking the central business district of Houston, Texas, USA
A beautiful park in Root square overlooking the central business district of Houston, Texas, USA

Weather in May

The last month of the spring, May, is another warm month in Houston, Texas, with an average temperature ranging between min 70°F (21.1°C) and max 85.8°F (29.9°C).

Temperature

In May, the average high-temperature slightly increases from 78.8°F (26°C) in April to a still moderately hot 85.8°F (29.9°C). In May, the average low-temperature is 70°F (21.1°C).

Heat index

The average heat index in May is evaluated at a torrid 96.4°F (35.8°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'apparent temperature', 'feels like', or 'felt air temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (pregnancy, clothing, metabolic differences). Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 99.5°F (37.5°C) to 100.9°F (38.3°C), thermal conditions are potentially life-threatening.

Humidity

The average relative humidity in May in Houston is 74%.

Rainfall

In May, in Houston, Texas, the rain falls for 14.8 days. Throughout May, 4.45" (113mm) of precipitation is accumulated. In Houston, during the entire year, the rain falls for 180.5 days and collects up to 35.35" (898mm) of precipitation.

Snowfall

In Houston, snow does not fall in February through November.

Daylight

In May, the average length of the day is 13h and 40min.
On the first day of the month, sunrise is at 6:38 am and sunset at 7:58 pm. On the last day of May, sunrise is at 6:21 am and sunset at 8:16 pm CDT.

Sunshine

In May, the average sunshine is 9.3h.

UV index

The months with the highest UV index are May through August, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for the ordinary person.
Note: In May, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in May in Houston?

In May, the average high-temperature is 85.8°F (29.9°C), and the average low-temperature is 70°F (21.1°C). In May, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is evaluated at 96.4°F (35.8°C).

What is the average humidity in May in Houston?

In Houston, Texas, the average relative humidity in May is 74%.

How much does it rain in Houston in May?

In Houston, Texas, in May, it is raining for 14.8 days, with typically 4.45" (113mm) of accumulated precipitation.

When it does not snow in Houston?

In Houston, Texas, snow does not fall in February through November.

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

In May, the average day length is 13h and 40min.

What time are sunrise and sunset in May in Houston?

In May, on the first day of the month, sunrise is at 6:38 am and sunset at 7:58 pm. On the last day of the month, in Houston, sunrise is at 6:21 am and sunset at 8:16 pm CDT.

How many hours of sunshine does Houston have in May?

In May, the average sunshine duration in Houston is 9.3h.

When is the highest UV index in Houston?

May through August, with an average maximum UV index of 7, are months with the highest UV index in Houston.

What is the UV index reading in May in Houston?

The average daily maximum UV index in May in Houston is 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to Sun's UV rays.

Average temperature in May
Houston, TX

Average temperature in May - Houston, TX
  • Average high temperature in May: 85.8°F

The warmest month (with the highest average high temperature) is August (94.3°F).
The month with the lowest average high temperature is January (61.3°F).

  • Average low temperature in May: 70°F

The month with the highest average low temperature is August (77.5°F).
The coldest month (with the lowest average low temperature) is January (46°F).

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Average pressure in May
Houston, TX

Average pressure in May - Houston, TX
  • Average pressure in May: 29.95"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed in May
Houston, TX

Average wind speed in May - Houston, TX
  • Average wind speed in May: 8mph

The windiest month (with the highest average wind speed) is April (8.6mph).
The calmest month (with the lowest average wind speed) is September (5.9mph).

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Average humidity in May
Houston, TX

Average humidity in May - Houston, TX
  • Average humidity in May: 74%

The month with the highest relative humidity is February (78%).
The months with the lowest relative humidity are August and October (70%).

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Average rainfall in May
Houston, TX

Average rainfall in May - Houston, TX
  • Average rainfall in May: 4.45"

The wettest month (with the highest rainfall) is September (4.49").
The driest month (with the least rainfall) is February (1.77").

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Average rainfall days in May
Houston, TX

Average rainfall days in May - Houston, TX
  • Average rainfall days in May: 14.8 days

The month with the highest number of rainy days is September (19.5 days).
The month with the least rainy days is January (11.8 days).

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Average snowfall in May
Houston, TX

Average snowfall in May - Houston, TX
  • Average snowfall in May: 0"

The month with the highest snowfall is December (0.08").
The months with the least snowfall are February, March, April, May, June, July, August, September, October and November (0").

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Average snowfall days in May
Houston, TX

Average snowfall days in May - Houston, TX
  • Average snowfall days in May: 0 days

The months with the highest number of snowfall days are January and December (0.1 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October and November (0 days).

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Average daylight in May /
Average sunshine in May
Houston, TX

Average daylight in May / Average sunshine in May - Houston, TX
  • Average daylight in May: 13h and 40min

The month with the longest days is June (Average daylight: 14h and 2min).
The month with the shortest days is December (Average daylight: 10h and 16min).

  • Average sunshine in May: 9.3h

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

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Average sunshine days in May
Houston, TX

Average sunshine days in May - Houston, TX
  • Average sunshine days in May: 14.2 days

The month with the most sunshine days is January (16.3 days).
The month with the least sunshine days is September (7.9 days).

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Average UV index in May
Houston, TX

Average UV index in May - Houston, TX
  • Average UV index in May: 7

The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in May
Houston, TX

Average cloud cover in May - Houston, TX
  • Average cloud cover in May: 39

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in May
Houston, TX

Average visibility in May - Houston, TX
  • 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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