Flagstaff
Arizona, USA
Long-term weather forecast
Long-term weather forecast

April weather forecast and climate
Flagstaff, AZ

A close-up of the brown iconic clock tower in the city of Flagstaff, Arizona, with the street signs of Birch Avenue and San Francisco Street
A close-up of the brown iconic clock tower in the city of Flagstaff, Arizona, with the street signs of Birch Avenue and San Francisco Street
April in Flagstaff, Arizona, is a moderate spring month, with average temperature varying between 28.6°F (-1.9°C) and 58.3°F (14.6°C).

Temperature

In Flagstaff, the average high-temperature slightly increases, from a cool 50.4°F (10.2°C) in March, to a moderate 58.3°F (14.6°C). In April, the average low-temperature is 28.6°F (-1.9°C).

Humidity

The average relative humidity in Flagstaff is 46.5%.

Rainfall

In Flagstaff, during April, the rain falls for 5.8 days and regularly aggregates up to 1.1" (29.2mm) of precipitation. Throughout the year, there are 87.7 rainfall days, and 21.9" (555.3mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall.

Daylight

In Flagstaff, the average length of the day is 13.1h.

Sunshine

The average sunshine in Flagstaff is 10.7h.

UV index

The average daily maximum UV index in Flagstaff is 8. A UV Index of 8 to 10 symbolizes a very high threat to health from the exposure to the Sun's UV radiation for the ordinary person.
Note: In April, the average maximum UV index of 8 translate into the following recommendations:
Take special precautions, as unprotected eyes and skin can be burned and damaged quickly. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in April in Flagstaff?

In Flagstaff, in April, the average high-temperature is 58.3°F (14.6°C), and the average low-temperature is 28.6°F (-1.9°C).

What is the average humidity in April in Flagstaff?

The average relative humidity in April is 46.5%.

How much does it rain in Flagstaff in April?

In Flagstaff, Arizona, in April, it is raining for 5.8 days, with typically 1.1" (29.2mm) of accumulated precipitation.

How many days does it snow in April in Flagstaff?

In Flagstaff, in April, snow falls for 3 days, with typically accumulated 7.1" (180.3mm) of snow.

How many hours of daylight does Flagstaff have in April?

In April, the average length of the day is 13.1h.

How long on average sun shines in April in Flagstaff?

In Flagstaff, Arizona, the average sunshine in April is 10.7h.

What is the UV index intensity in April in Flagstaff?

The average daily maximum UV index in April in Flagstaff, Arizona, is 8. A UV Index estimate of 8 to 10 represents a very high health threat from unsafe exposure to the Sun's UV rays.
Average temperature in April - Flagstaff, AZ
  • Average high temperature in April: 58.2°F

The warmest month (with the highest average high temperature) is July (81.2°F).
Months with the lowest average high temperature are January and December (42.5°F).

  • Average low temperature in April: 28.5°F

The month with the highest average low temperature is July (50.9°F).
The coldest month (with the lowest average low temperature) is December (16.8°F).

Average humidity in April - Flagstaff, AZ
  • Average humidity in April: 46.5%

The month with the highest relative humidity is January (61.9%).
The month with the lowest relative humidity is June (33.6%).

Average rainfall in April - Flagstaff, AZ
  • Average rainfall in April: 1.2"

The wettest month (with the highest rainfall) is August (3.1").
The driest month (with the lowest rainfall) is June (0.4").

Average rainfall days in April - Flagstaff, AZ
  • Average rainfall days in April: 5.8 days

The month with the highest number of rainy days is August (14 days).
The month with the lowest number of rainy days is June (2.6 days).

Average snowfall in April - Flagstaff, AZ
  • Average snowfall in April: 7.1"

The month with the highest snowfall is January (23.2").
Months with the lowest snowfall are June, July, August and September (0").

Average snowfall days in April - Flagstaff, AZ
  • Average snowfall days in April: 3 days

The month with the highest number of snowfall days is January (7.5 days).
Months with the lowest number of snowfall days are June, July, August and September (0 days).

Average daylight in April / Average sunshine in April - Flagstaff, AZ
  • Average daylight in April: 13.1h

The month with the longest days is June (Average daylight: 14.5h).
The month with shortest days is December (Average daylight: 9.8h).

  • Average sunshine in April: 10.7h

The month with most sunshine is June (Average sunshine: 12.4h).
The month with least sunshine is December (Average sunshine: 7.1h).

Average UV index in April - Flagstaff, AZ
  • Average UV index in April: 8

The month with the highest UV index is July (UV index 12).
Months with the lowest UV index are January and December (UV index 3).