April weather forecast and climate
Boise, ID

The golden fall season in Boise, Idaho, with the tall city buildings
The golden fall season in Boise, Idaho, with the tall city buildings
April is a mild spring month in Boise, Idaho, with average temperature varying between 56.7°F (13.7°C) and 38.1°F (3.4°C).

Temperature

In April, the average high-temperature marginally rises, from a chilly 48.9°F (9.4°C) in March, to a mild 56.7°F (13.7°C). The average low-temperature, is 38.1°F (3.4°C).

Humidity

In April, the average relative humidity is 57%.

Rainfall

In April, in Boise, Idaho, the rain falls for 13.9 days. Throughout April, 1.3" (33mm) of precipitation is accumulated. In Boise, during the entire year, the rain falls for 116.8 days and collects up to 15.08" (383mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. April is the last month it regularly snows. During 0.4 snowfall days, Boise aggregates 0.08" (2mm) of snow. Throughout the year, in Boise, there are 31.4 snowfall days, and 21.3" (541mm) of snow is accumulated.

Daylight

In April, the average length of the day is 13.5h.

Sunshine

The average sunshine in Boise is 9.5h.

UV index

The average daily maximum UV index in Boise, Idaho, is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to the UV radiation for ordinary individuals.
Note: In April, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in April in Boise?

In April, in Boise, the average high-temperature is 56.7°F (13.7°C), and the average low-temperature is 38.1°F (3.4°C).

What is the average humidity in April in Boise?

In April, the average relative humidity in Boise, Idaho, is 57%.

How many days does it rain in April in Boise?

In Boise, Idaho, during April, the rain falls for 13.9 days and regularly aggregates up to 1.3" (33mm) of precipitation.

What is the last month it snows in Boise?

April is the last month it regularly snows. During 0.4 snowfall days, in April, Boise aggregates 0.08" (2mm) of snow.

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

In April, the average length of the day in Boise, Idaho, is 13.5h.

How many hours of sunshine does Boise have in April?

In Boise, Idaho, the average sunshine in April is 9.5h.

How high is the UV index in April in Boise?

In April, the average daily maximum UV index in Boise, Idaho, is 3. A UV Index reading of 3 to 5 represents a moderate vulnerability from the exposure to the Sun's UV rays.
Average temperature in April - Boise, ID
  • Average high temperature in April: 13.7°C

The warmest month (with the highest average high temperature) is July (31°C).
The month with the lowest average high temperature is December (1.5°C).

  • Average low temperature in April: 3.4°C

The month with the highest average low temperature is August (16.3°C).
The coldest month (with the lowest average low temperature) is December (-4.9°C).

Average pressure in April - Boise, ID
  • Average pressure in April: 1015.3mbar

The month with the highest atmospheric pressure is January (1024.4mbar).
The month with the lowest atmospheric pressure is June (1012.6mbar).

Average wind speed in April - Boise, ID
  • Average wind speed in April: 11.4km/h

The windiest month (with the highest average wind speed) is April (11.4km/h).
The calmest month (with the lowest average wind speed) is January (8.4km/h).

Average humidity in April - Boise, ID
  • Average humidity in April: 57%

The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is July (30%).

Average rainfall in April - Boise, ID
  • Average rainfall in April: 33mm

The wettest month (with the highest rainfall) is March (56mm).
The driest month (with the least rainfall) is July (5mm).

Average rainfall days in April - Boise, ID
  • Average rainfall days in April: 13.9 days

The month with the highest number of rainy days is March (16.2 days).
The month with the least rainy days is July (4.5 days).

Average snowfall in April - Boise, ID
  • Average snowfall in April: 2mm

The month with the highest snowfall is December (169mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

Average snowfall days in April - Boise, ID
  • Average snowfall days in April: 0.4 days

The month with the highest number of snowfall days is December (9.2 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in April / Average sunshine in April - Boise, ID
  • Average daylight in April: 13.5h

The month with the longest days is June (Average daylight: 15.4h).
The month with the shortest days is December (Average daylight: 9h).

  • Average sunshine in April: 9.5h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 5.5h).

Average sunshine days in April - Boise, ID
  • Average sunshine days in April: 14.3 days

The month with the most sunshine days is July (23.6 days).
The month with the least sunshine days is March (12.1 days).

Average UV index in April - Boise, ID
  • Average UV index in April: 3

The month with the highest UV index is July (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in April - Boise, ID
  • Average cloud cover in April: 30

The month with the most cloud cover is December (Cloud cover 42).
The month with the least cloud cover is July (Cloud cover 8).

Average visibility in April - Boise, ID
  • Average visibility in April: 10km

Months with the highest visibility are March, April, May, June, July, August, September, October and November (10km).
The month with the lowest visibility is January (8km).