May weather forecast and climate
Fontana, CA

Weather in May

May, the last month of the spring, in Fontana, is a moderately hot month, with average temperature varying between 76.6°F (24.8°C) and 54°F (12.2°C).

Temperature

In Fontana, the average high-temperature in May is essentially the same as in April - a warm 76.6°F (24.8°C). The average low-temperature, in Fontana, is 54°F (12.2°C).

Humidity

February, March and May, with an average relative humidity of 52%, are most humid months in Fontana, California.

Rainfall

In Fontana, it is raining for 3.6 days, with typically 0.2" (5mm) of accumulated precipitation. Throughout the year, there are 48.1 rainfall days, and 6.89" (175mm) of precipitation is accumulated.

Snowfall

January, March through December are months without snowfall in Fontana.

Daylight

In Fontana, California, the average length of the day is 14h.

Sunshine

In Fontana, the average sunshine is 11.8h.

UV index

The average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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 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 Fontana?

In May, the average high-temperature is 76.6°F (24.8°C), and the average low-temperature is 54°F (12.2°C).

What are the most humid months in Fontana?

February, March and May, with an average relative humidity of 52%, are most humid months in Fontana.

What is the average humidity in May in Fontana?

The average relative humidity in May in Fontana, California, is 52%.

How many days does it rain in May in Fontana?

In Fontana, California, during May, the rain falls for 3.6 days and regularly aggregates up to 0.2" (5mm) of precipitation.

When it does not snow in Fontana?

January, March through December are months without snowfall in Fontana.

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

In Fontana, California, the average length of the day in May is 14h.

How long on average sun shines in May in Fontana?

In May, the average sunshine in Fontana, California, is 11.8h.

What is the UV index reading in May in Fontana?

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

Average temperature in May
Fontana, CA

Average temperature in May - Fontana, CA
  • Average high temperature in May: 76.6°F

The warmest month (with the highest average high temperature) is August (92.1°F).
The month with the lowest average high temperature is December (60.8°F).

  • Average low temperature in May: 54°F

The month with the highest average low temperature is August (67.3°F).
The coldest months (with the lowest average low temperature) are February and December (44.2°F).

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Average pressure in May
Fontana, CA

Average pressure in May - Fontana, CA
  • Average pressure in May: 29.9"

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

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Average wind speed in May
Fontana, CA

Average wind speed in May - Fontana, CA
  • Average wind speed in May: 6mph

The windiest months (with the highest average wind speed) are April and May (6mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).

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Average humidity in May
Fontana, CA

Average humidity in May - Fontana, CA
  • Average humidity in May: 52%

Months with the highest relative humidity are February, March and May (52%).
The month with the lowest relative humidity is August (39%).

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Average rainfall in May
Fontana, CA

Average rainfall in May - Fontana, CA
  • Average rainfall in May: 0.2"

The wettest month (with the highest rainfall) is February (1.57").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in May
Fontana, CA

Average rainfall days in May - Fontana, CA
  • Average rainfall days in May: 3.6 days

The month with the highest number of rainy days is March (7.5 days).
The month with the least rainy days is June (1.2 days).

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Average snowfall days in May
Fontana, CA

Average snowfall days in May - Fontana, CA
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is February (0.1 days).
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 May /
Average sunshine in May
Fontana, CA

Average daylight in May / Average sunshine in May - Fontana, CA
  • Average daylight in May: 14h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in May: 11.8h

Months with the most sunshine are June, July and August (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6.9h).

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Average sunshine days in May
Fontana, CA

Average sunshine days in May - Fontana, CA
  • Average sunshine days in May: 26.3 days

The month with the most sunshine days is June (28.3 days).
The month with the least sunshine days is February (21.1 days).

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Average UV index in May
Fontana, CA

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

Months with the highest UV index are 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
Fontana, CA

Average cloud cover in May - Fontana, CA
  • Average cloud cover in May: 12

Months with the most cloud cover are February, March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 4).

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Average visibility in May
Fontana, CA

Average visibility in May - Fontana, CA
  • Average visibility in May: 6mi

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

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