April weather forecastUnalaska, AK
April
Weather in April
April's weather marks a noticeable transition from winter to spring in Unalaska with temperatures gradually rising to high 30s°F and low rainfall of 2.44" (62mm). The increased daylight hours encourage outdoor activities while the expanded sunshine length adds a warming effect. The wind speed slows down by comparison to previous months. Advancing into spring, humidity levels take a slight upward turn. Despite the lengthening of daylight, the UV index remains on the lower side, providing safer outdoor conditions.Temperature
In April, the average high-temperature registers at a still wintry 37.4°F (3°C), nearly identical to March's 34.7°F (1.5°C). Unalaska experiences an average nighttime temperature of 33.4°F (0.8°C) in April, reflecting a minor difference from the day's peak.Humidity
In Unalaska, the average relative humidity in April is 84%.Rainfall
In Unalaska, in April, during 15.8 rainfall days, 2.44" (62mm) of precipitation is typically accumulated. In Unalaska, during the entire year, the rain falls for 198.8 days and collects up to 33.78" (858mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Unalaska, in April, snow falls for 12.2 days, with typically accumulated 4.09" (104mm) of snow. Throughout the year, there are 78.3 snowfall days, and 30.39" (772mm) of snow is accumulated.Ocean temperature
In April, the average ocean temperature is 39°F (3.9°C).Note: In swimming scenarios, this is an immediate danger to life. Breathing becomes uncontrollable instantly, obstructing any form of clear thinking. A specialized swimsuit is indispensable to lessen thermal leakage.
Daylight
In April, the average length of the day is 14h and 6min.On the first day of the month, sunrise is at 8:36 am and sunset at 9:43 pm. On the last day of April, sunrise is at 7:29 am and sunset at 10:36 pm AKDT.
Sunshine
In Unalaska, the average sunshine in April is 4.4h.UV index
February through April and November, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In April, the average maximum UV index of 1 translates into the following recommendations:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Unalaska, AK
- Average high temperature in April: 37.4°F
The warmest month (with the highest average high temperature) is August (53.2°F).
The month with the lowest average high temperature is March (34.7°F).
- Average low temperature in April: 33.4°F
The month with the highest average low temperature is August (49.6°F).
The coldest month (with the lowest average low temperature) is March (30.7°F).
Average pressure in April
Unalaska, AK
- Average pressure in April: 29.72"Hg
The month with the highest atmospheric pressure is July (29.98"Hg).
The month with the lowest atmospheric pressure is January (29.5"Hg).
Average wind speed in April
Unalaska, AK
- Average wind speed in April: 14.4mph
The windiest months (with the highest average wind speed) are November and December (16.5mph).
The calmest month (with the lowest average wind speed) is July (9.1mph).
Average humidity in April
Unalaska, AK
- Average humidity in April: 84%
The month with the highest relative humidity is July (91%).
The months with the lowest relative humidity are November and December (80%).
Average rainfall in April
Unalaska, AK
- Average rainfall in April: 2.44"
The wettest month (with the highest rainfall) is December (4.21").
The driest month (with the least rainfall) is July (1.85").
Average rainfall days in April
Unalaska, AK
- Average rainfall days in April: 15.8 days
The month with the highest number of rainy days is October (21.8 days).
The month with the least rainy days is February (11.1 days).
Average snowfall in April
Unalaska, AK
- Average snowfall in April: 4.09"
The month with the highest snowfall is January (6.97").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in April
Unalaska, AK
- Average snowfall days in April: 12.2 days
The month with the highest number of snowfall days is January (14.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in April
Unalaska, AK
- Average sea temperature in April: 39°F
The best month for swimming (with the highest average sea temperature) is August (50.1°F).
The coldest month (with the lowest average sea temperature) is February (38.8°F).
Average daylight in April /
Average sunshine in April
Unalaska, AK
- Average daylight in April: 14h and 6min
The month with the longest days is June (Average daylight: 17h and 0min).
The month with the shortest days is December (Average daylight: 7h and 30min).
- Average sunshine in April: 4h and 24min
The month with the most sunshine is June (Average sunshine: 5h and 48min).
The month with the least sunshine is December (Average sunshine: 2h and 0min).
Average sunshine days in April
Unalaska, AK
- Average sunshine days in April: 3.8 days
The month with the most sunshine days is August (9.7 days).
The month with the least sunshine days is April (3.8 days).
Average UV index in April
Unalaska, AK
- Average UV index in April: 1
The months with the highest UV index are July and August (UV index 3).
The months with the lowest UV index are February, March, April and November (UV index 1).
Average cloud cover in April
Unalaska, AK
- Average cloud cover in April: 73
The month with the most cloud cover is July (Cloud cover 74).
The months with the least cloud cover are September and October (Cloud cover 66).
Average visibility in April
Unalaska, AK
- Average visibility in April: 5mi
The months with the highest visibility are May, June, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March, April, July and December (5mi).
