Contents
- Weather in April
- Frequently asked questions
- Average temperature in April
- Average pressure in April
- Average wind speed in April
- Average humidity in April
- Average rainfall in April
- Average rainfall days in April
- Average snowfall in April
- Average snowfall days in April
- Average daylight in April
- Average sunshine in April
- Average sunshine days in April
- Average UV index in April
- Average cloud cover in April
- Average visibility in April
Weather in April
Temperature
The beginning of April signals a rise in the average high-temperature, moving from a cool 51.4°F (10.8°C) in March to a refreshing 61.3°F (16.3°C). In the month of April, the temperature generally rests at an average low of 41.5°F (5.3°C).Humidity
In April, the average relative humidity is 52%.Rainfall
In Mattawa, in April, during 8.8 rainfall days, 0.39" (10mm) of precipitation is typically accumulated. In Mattawa, during the entire year, the rain falls for 86.4 days and collects up to 6.38" (162mm) of precipitation.Snowfall
January through April, September, November and December are months with snowfall. April is the last month it regularly snows. During 0.4 snowfall days, in April, Mattawa aggregates 0.08" (2mm) of snow. In Mattawa, during the entire year, snow falls for 22.3 days and aggregates up to 10" (254mm) of snow.Daylight
In April, the average length of the day is 13h and 38min.On the first day of the month, sunrise is at 6:37 am and sunset at 7:29 pm. On the last day of April, sunrise is at 5:44 am and sunset at 8:08 pm PDT.
Sunshine
In Mattawa, the average sunshine in April is 10.3h.UV index
The average daily maximum UV index in April is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: In April, a daily maximum UV index of 4 leads to the following instructions:
Prioritize safety - Recommendations to avert sunburn are shared. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in April?
What is the average humidity in April?
How much does it rain in April?
What is the last month it snows?
What is the average length of the day in April?
What time are sunrise and sunset in April?
How many hours of sunshine does Mattawa have in April?
What is the UV index reading in April?
Average temperature in April
Mattawa, WA
- Average high temperature in April: 61.3°F
The warmest months (with the highest average high temperature) are July and August (88.3°F).
The month with the lowest average high temperature is December (34.5°F).
- Average low temperature in April: 41.5°F
The month with the highest average low temperature is August (61.5°F).
The coldest month (with the lowest average low temperature) is December (24.3°F).
Average pressure in April
Mattawa, WA
- Average pressure in April: 29.99"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in April
Mattawa, WA
- Average wind speed in April: 7.6mph
The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest month (with the lowest average wind speed) is December (4.7mph).
Average humidity in April
Mattawa, WA
- Average humidity in April: 52%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is July (37%).
Average rainfall in April
Mattawa, WA
- Average rainfall in April: 0.39"
The wettest months (with the highest rainfall) are January and December (0.87").
The driest month (with the least rainfall) is August (0.2").
Average rainfall days in April
Mattawa, WA
- Average rainfall days in April: 8.8 days
The month with the highest number of rainy days is March (10.6 days).
The month with the least rainy days is August (3.5 days).
Average snowfall in April
Mattawa, WA
- Average snowfall in April: 0.08"
The month with the highest snowfall is December (3.43").
The months with the least snowfall are May, June, July, August and October (0").
Average snowfall days in April
Mattawa, WA
- Average snowfall days in April: 0.4 days
The month with the highest number of snowfall days is December (6.5 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in April /
Average sunshine in April
Mattawa, WA
- Average daylight in April: 13h and 4min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in April: 10h and 2min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).
Average sunshine days in April
Mattawa, WA
- Average sunshine days in April: 19 days
The months with the most sunshine days are July and August (25.8 days).
The month with the least sunshine days is February (16 days).
Average UV index in April
Mattawa, WA
- Average UV index in April: 4
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in April
Mattawa, WA
- Average cloud cover in April: 32
The month with the most cloud cover is January (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 10).
Average visibility in April
Mattawa, WA
- Average visibility in April: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (5mi).
Mattawa, Washington, USA
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