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

May 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
May, the last month of the spring, in Flagstaff, is an agreeable month, with average temperature ranging between min 35.1°F (1.7°C) and max 68.2°F (20.1°C).

Temperature

In May, the average high-temperature rises, from a mild 58.3°F (14.6°C) in April, to an agreeable 68.2°F (20.1°C). The average low-temperature, in Flagstaff, is 35.1°F (1.7°C).

Humidity

In May, the average relative humidity is 39.4%.

Rainfall

In May, the rain falls for 4.5 days. Throughout May, 0.6" (16mm) of precipitation is accumulated. In Flagstaff, during the entire year, the rain falls for 87.7 days and collects up to 21.9" (555.3mm) of precipitation.

Snowfall

Months with snowfall in Flagstaff are January through May, October through December. May is the last month it regularly snows in Flagstaff. During 0.8 snowfall days, in May, Flagstaff aggregates 0.7" (17.8mm) of snow. In Flagstaff, during the entire year, snow falls for 34.9 days, and aggregates up to 101.7" (2583.3mm) of snow.

Daylight

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

Sunshine

In Flagstaff, the average sunshine in May is 11.9h.

UV index

In May, the average daily maximum UV index is 10. A UV Index of 8 to 10 symbolizes a very high health vulnerability from unsafe exposure to the UV radiation for average individuals.
Note: In May, the average maximum UV index of 10 translate into the following recommendations:
Take extra precautions. Protection against sun damage is required. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in May in Flagstaff?

In Flagstaff, Arizona, in May, the average high-temperature is 68.2°F (20.1°C), and the average low-temperature is 35.1°F (1.7°C).

What is the average humidity in May in Flagstaff?

In Flagstaff, the average relative humidity in May is 39.4%.

How much does it rain in Flagstaff in May?

In May, in Flagstaff, the rain falls for 4.5 days. Throughout May, 0.6" (16mm) of precipitation is accumulated.

What is the last month it snows in Flagstaff?

May is the last month it regularly snows in Flagstaff. During 0.8 snowfall days, in May, Flagstaff aggregates 0.7" (17.8mm) of snow.

How many hours of daylight does Flagstaff have in May?

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

How many hours of sunshine does Flagstaff have in May?

The average sunshine in May is 11.9h.

What is the UV index intensity in May in Flagstaff?

In Flagstaff, the average daily maximum UV index in May is 10. A UV Index of 8 to 10 symbolizes a very high health threat from the exposure to the Sun's UV radiation.
Average temperature in May - Flagstaff, AZ
  • Average high temperature in May: 68.1°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 May: 35°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 May - Flagstaff, AZ
  • Average humidity in May: 39.4%

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 May - Flagstaff, AZ
  • Average rainfall in May: 0.6"

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 May - Flagstaff, AZ
  • Average rainfall days in May: 4.5 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 May - Flagstaff, AZ
  • Average snowfall in May: 0.7"

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 May - Flagstaff, AZ
  • Average snowfall days in May: 0.8 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 May / Average sunshine in May - Flagstaff, AZ
  • Average daylight in May: 14h

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 May: 11.9h

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 May - Flagstaff, AZ
  • Average UV index in May: 10

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).