April weather forecast
Rialto, CA

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Weather in April

April in Rialto, California, is an agreeable spring month, with an average temperature fluctuating between 48.2°F (9°C) and 71.8°F (22.1°C).

Temperature

As Rialto, California, steps into April, the average high-temperature is measured at a pleasant 71.8°F (22.1°C), displaying minor differences from March's 66.9°F (19.4°C). April presents a pronounced divergence from daily peak temperatures, with the average low-temperature of 48.2°F (9°C).

Humidity

In Rialto, the average relative humidity in April is 50%.

Rainfall

In Rialto, during April, the rain falls for 5.2 days and regularly aggregates up to 0.59" (15mm) of precipitation. In Rialto, during the entire year, the rain falls for 43.5 days and collects up to 5.43" (138mm) of precipitation.

Snowfall

In Rialto, California, snow does not fall in January, March through December.

Daylight

In Rialto, the average length of the day in April is 13h and 4min.
On the first day of April, sunrise is at 6:35 am and sunset at 7:10 pm. On the last day of the month, sunrise is at 6:00 am and sunset at 7:33 pm PDT.

Sunshine

The average sunshine in April in Rialto is 11.4h.

UV index

In Rialto, California, the average daily maximum UV index in April is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.
Note: In April, an average UV index of 5 transforms into the following instructions:
Make use of precautions - Suggestions to resist sunburn are communicated. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
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Frequently asked questions

What is the temperature in April in Rialto?

Rialto in April has an average high-temperature of 71.8°F (22.1°C) and an average low-temperature of 48.2°F (9°C).

What is the average humidity in April in Rialto?

The average relative humidity in April in Rialto is 50%.

How many days does it rain in April in Rialto?

In Rialto, during April, the rain falls for 5.2 days and regularly aggregates up to 0.59" (15mm) of precipitation.

When it does not snow in Rialto?

January, March through December are months without snowfall.

What is the average length of the day in April in Rialto?

In April, the average day length is 13h and 4min.

When is the sunrise / sunset in April in Rialto?

On the first day of April in Rialto, California, sunrise is at 6:35 am and sunset at 7:10 pm. On the last day of the month, sunrise is at 6:00 am and sunset at 7:33 pm PDT.

How many hours of sunshine does Rialto have in April?

In Rialto, California, the average sunshine duration in April is 11.4h.

How high is the UV index in April in Rialto?

The average daily maximum UV index in April is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in April
Rialto, CA

Average temperature in April - Rialto, CA
  • Average high temperature in April: 71.8°F

The warmest month (with the highest average high temperature) is August (91.9°F).
The month with the lowest average high temperature is December (59.9°F).

  • Average low temperature in April: 48.2°F

The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is February (43.3°F).

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Average pressure in April
Rialto, CA

Average pressure in April - Rialto, CA
  • Average pressure in April: 29.94"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).

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Average wind speed in April
Rialto, CA

Average wind speed in April - Rialto, CA
  • Average wind speed in April: 6.2mph

The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).

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Average humidity in April
Rialto, CA

Average humidity in April - Rialto, CA
  • Average humidity in April: 50%

The months with the highest relative humidity are February and March (52%).
The month with the lowest relative humidity is August (38%).

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Average rainfall in April
Rialto, CA

Average rainfall in April - Rialto, CA
  • Average rainfall in April: 0.59"

The wettest months (with the highest rainfall) are February and December (1.14").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in April
Rialto, CA

Average rainfall days in April - Rialto, CA
  • Average rainfall days in April: 5.2 days

The month with the highest number of rainy days is December (5.5 days).
The month with the least rainy days is June (1.3 days).

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Average snowfall days in April
Rialto, CA

Average snowfall days in April - Rialto, CA
  • Average snowfall days in April: 0 days

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

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Average daylight in April /
Average sunshine in April
Rialto, CA

Average daylight in April / Average sunshine in April - Rialto, CA
  • Average daylight in April: 13h and 1min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in April: 11h and 2min

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 54min).

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Average sunshine days in April
Rialto, CA

Average sunshine days in April - Rialto, CA
  • Average sunshine days in April: 24.9 days

The month with the most sunshine days is June (27.8 days).
The month with the least sunshine days is February (22.6 days).

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Average UV index in April
Rialto, CA

Average UV index in April - Rialto, CA
  • Average UV index in April: 5

The months with the highest UV index are 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 April
Rialto, CA

Average cloud cover in April - Rialto, CA
  • Average cloud cover in April: 16

The month with the most cloud cover is December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in April
Rialto, CA

Average visibility in April - Rialto, CA
  • Average visibility in April: 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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Rialto, California, USA

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