Ontario
California, USA
Long-term weather forecast
Long-term weather forecast

March weather forecast and climate
Ontario, CA

A clear street near the luxurious residential estate in Ontario, California, with a scenic background of a hilly landscape, the clear blue sky
A clear street near the luxurious residential estate in Ontario, California, with a scenic background of a hilly landscape, the clear blue sky
March, the first month of the spring, in Ontario, is an agreeable month, with temperature in the range of an average high of 68.4°F (20.2°C) and an average low of 46.9°F (8.3°C).

Temperature

In Ontario, the average high-temperature is relatively the same as in February - an agreeable 68.4°F (20.2°C). In March, the average low-temperature is 46.9°F (8.3°C).

Humidity

Months with the highest humidity are March and May, with an average relative humidity of 54%.

Rainfall

In Ontario, during 7.1 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. Throughout the year, in Ontario, there are 49.6 rainfall days, and 7.8" (198mm) of precipitation is accumulated.

Snowfall

January, March through December are months without snowfall.

Daylight

The average length of the day in March is 12h.

Sunshine

In Ontario, the average sunshine in March is 9h.

UV index

In Ontario, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV rays for the ordinary person.
Note: In March, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.

What is the temperature in March in Ontario?

In March, in Ontario, the average high-temperature is 68.4°F (20.2°C), and the average low-temperature is 46.9°F (8.3°C).

What is the most humid month in Ontario?

March and May, with an average relative humidity of 54%, are most humid months in Ontario, California.

What is the average humidity in March in Ontario?

The average relative humidity in March in Ontario, California, is 54%.

How much does it rain in Ontario in March?

In Ontario, in March, it is raining for 7.1 days, with typically 0.79" (20mm) of accumulated precipitation.

Does it snow in Ontario in March?

In March, it doesn't snow. February is the latest month when it typically snows.

When it does not snow in Ontario?

January, March through December are months without snowfall.

How many hours of daylight does Ontario have in March?

In March, the average length of the day in Ontario, California, is 12h.

How long on average sun shines in March in Ontario?

In March, the average sunshine in Ontario is 9h.

How high is the UV index in March in Ontario?

In Ontario, the average daily maximum UV index in March is 5. A UV Index reading of 3 to 5 represents a medium health risk from unsafe exposure to the Sun's UV rays.
Average temperature in March - Ontario, CA
  • Average high temperature in March: 20.2°C

The warmest month (with the highest average high temperature) is August (32.8°C).
The month with the lowest average high temperature is December (16.7°C).

  • Average low temperature in March: 8.3°C

The month with the highest average low temperature is August (18.8°C).
The coldest month (with the lowest average low temperature) is December (7.5°C).

Average humidity in March - Ontario, CA
  • Average humidity in March: 54%

Months with the highest relative humidity are March and May (54%).
The month with the lowest relative humidity is August (42%).

Average rainfall in March - Ontario, CA
  • Average rainfall in March: 20mm

The wettest month (with the highest rainfall) is February (45mm).
The driest month (with the lowest rainfall) is June (1mm).

Average rainfall days in March - Ontario, CA
  • Average rainfall days in March: 7.1 days

The month with the highest number of rainy days is March (7.1 days).
The month with the lowest number of rainy days is June (1.2 days).

Average snowfall days in March - Ontario, CA
  • Average snowfall days in March: 0 days

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

Average daylight in March / Average sunshine in March - Ontario, CA
  • Average daylight in March: 12h

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

  • Average sunshine in March: 9h

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

Average UV index in March - Ontario, CA
  • Average UV index in March: 5

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).