May weather forecast
Riverdale, CA

Weather in May

The last month of the spring, May, is another warm month in Riverdale, California, with an average temperature ranging between max 82.8°F (28.2°C) and min 57°F (13.9°C).

Temperature

In Riverdale, the average high-temperature in May slightly increases from a warm 74.8°F (23.8°C) in April to a still moderately hot 82.8°F (28.2°C). The average low-temperature, in Riverdale, is 57°F (13.9°C).

Heat index

In May, the average heat index is computed to be 82.4°F (28°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
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 'apparent temperature', 'felt air temperature', 'feels like', or 'real feel', 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 (wind, metabolic differences, clothing). 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.

Humidity

In May, the average relative humidity in Riverdale is 43%.

Rainfall

In Riverdale, California, it is raining for 4 days, with typically 0.51" (13mm) of accumulated precipitation. Throughout the year, in Riverdale, California, there are 58.2 rainfall days, and 9.29" (236mm) of precipitation is accumulated.

Daylight

In Riverdale, the average length of the day in May is 14h and 7min.
On the first day of the month, sunrise is at 6:05 am and sunset at 7:47 pm. On the last day of May, in Riverdale, sunrise is at 5:43 am and sunset at 8:11 pm PDT.

Sunshine

The average sunshine in May in Riverdale, California, is 11.6h.

UV index

The average daily maximum UV index in May in Riverdale, California, is 6. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 6 in May interpret into the following advice:
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. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in May in Riverdale?

In May, in Riverdale, California, the average high-temperature is 82.8°F (28.2°C), and the average low-temperature is 57°F (13.9°C). in May, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines air temperature and relative humidity, is computed to be 82.4°F (28°C).

What is the average humidity in May in Riverdale?

In Riverdale, the average relative humidity in May is 43%.

How many days does it rain in May in Riverdale?

In Riverdale, California, in May, it is raining for 4 days, with typically 0.51" (13mm) of accumulated precipitation.

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

In Riverdale, the average day length in May is 14h and 7min.

When is the sunrise / sunset in May in Riverdale?

In May, on the first day of the month, sunrise is at 6:05 am and sunset at 7:47 pm. On the last day of the month, in Riverdale, California, sunrise is at 5:43 am and sunset at 8:11 pm PDT.

How long on average sun shines in May in Riverdale?

The average sunshine duration in May is 11.6h.

How high is the UV index in May in Riverdale?

In Riverdale, California, the average daily maximum UV index in May is 6. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Riverdale, CA

Average temperature in May - Riverdale, CA
  • Average high temperature in May: 82.8°F

The warmest month (with the highest average high temperature) is July (102.2°F).
The month with the lowest average high temperature is December (57.2°F).

  • Average low temperature in May: 57°F

The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is December (43°F).

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Average pressure in May
Riverdale, CA

Average pressure in May - Riverdale, CA
  • Average pressure in May: 29.94"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

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Average wind speed in May
Riverdale, CA

Average wind speed in May - Riverdale, CA
  • Average wind speed in May: 6.6mph

The windiest month (with the highest average wind speed) is June (7.1mph).
The calmest months (with the lowest average wind speed) are January and November (4.8mph).

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Average humidity in May
Riverdale, CA

Average humidity in May - Riverdale, CA
  • Average humidity in May: 43%

The months with the highest relative humidity are January and December (66%).
The month with the lowest relative humidity is July (30%).

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Average rainfall in May
Riverdale, CA

Average rainfall in May - Riverdale, CA
  • Average rainfall in May: 0.51"

The wettest months (with the highest rainfall) are January, February and March (1.54").
The driest month (with the least rainfall) is August (0.08").

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Average rainfall days in May
Riverdale, CA

Average rainfall days in May - Riverdale, CA
  • Average rainfall days in May: 4 days

The month with the highest number of rainy days is March (9.6 days).
The month with the least rainy days is August (0.8 days).

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Average daylight in May /
Average sunshine in May
Riverdale, CA

Average daylight in May / Average sunshine in May - Riverdale, CA
  • Average daylight in May: 14h and 7min

The month with the longest days is June (Average daylight: 14h and 37min).
The month with the shortest days is December (Average daylight: 9h and 43min).

  • Average sunshine in May: 11h and 36min

The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).

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Average sunshine days in May
Riverdale, CA

Average sunshine days in May - Riverdale, CA
  • Average sunshine days in May: 26.4 days

The month with the most sunshine days is August (29.3 days).
The month with the least sunshine days is February (19.4 days).

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Average UV index in May
Riverdale, CA

Average UV index in May - Riverdale, CA
  • Average UV index in May: 6

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

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Average cloud cover in May
Riverdale, CA

Average cloud cover in May - Riverdale, CA
  • Average cloud cover in May: 15

The months with the most cloud cover are March and December (Cloud cover 28).
The month with the least cloud cover is August (Cloud cover 4).

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Average visibility in May
Riverdale, CA

Average visibility in May - Riverdale, CA
  • 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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