Arlington weather in April

In April, Arlington sees average daytime highs of 56°F and overnight lows near 42°F, with 5.6 in of precipitation across 16.4 wet days and about 13.4 hours of daylight. It is the 7th-warmest and 7th-wettest month of the year here.

Highs climb over the month, from about 53°F in the first days to 59°F by the end. The sky is clear or mostly clear about 16% of the time in April, and the air most often feels dry.

Daylight stretches from about 12 h 30 min at the start of April to 14 h 12 min by month's end. Set against the rest of the year, April is Arlington's 7th-clearest and 6th-windiest month. For the whole year in context, see Arlington's year-round climate.

Daytime high
56°
7th warmest
Overnight low
42°
6th coldest
Precipitation
5.6 in
16.4 wet days
Daylight
13 h 24 min
5:26 AM – 6:51 PM
Cloud cover
71%
7th clearest
Wind
5 mph
6th windiest
Solar energy
4.29 kWh/m²
Travel score
3.2
out of 10

Arlington is city in northern Snohomish County, Washington, United States.

Density
790/km²
people per km²
Founded
1903

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 53°F in the first days to 59°F by the end.

A typical April day in Arlington reaches about 56°F in the afternoon and slips back to 42°F overnight — a 14°F spread between the day's warmth and the night's chill. On most days the high lands between 49°F and 65°F. Set against its neighbours, April runs about 5°F warmer than March and about 6°F cooler than May.

30°40°50°60°70°80°151015202530
Avg high (°F)Avg low (°F)
15340
25340
35340
45440
55440
65440
75441
85441
95541
105541
115541
125541
135542
145642
155642
165642
175642
185642
195742
205743
215743
225743
235843
245843
255843
265844
275844
285944
295944
305944

How April really feels in Arlington

Once humidity and wind are folded in, April averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

April sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Arlington weather by month

How April compares with the rest of the year at a glance. April is the 7th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan44° / 36°9.319.15.38.60.6
Feb47° / 36°6.115.54.59.91.2
Mar51° / 38°7.619.63.711.61.9
Apr56° / 42°5.616.4113.43.2
May62° / 47°3.812.10.114.95.0
Jun66° / 51°2.89.8015.86.0
Jul72° / 55°1.35.2015.57.8
Aug73° / 55°1.65.5014.17.8
Sep67° / 50°3.48.8012.46.5
Oct57° / 44°7.214.9010.63.7
Nov48° / 38°10.419.22.291.4
Dec43° / 35°9.319.26.18.20.4

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 16% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 15% of April, with mostly cloudy or overcast conditions the remaining 69%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12773
22773
32773
42674
52674
62674
72674
82674
92674
102773
112773
122872
132971
143070
153169
163268
173268
183367
193367
203466
213565
223565
233565
243466
253565
263565
273664
283664
293763
303664

Chance of precipitation in April

Any precipitationSnow

Arlington gets around 5.6 in of rain and snow over 16.4 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 55% and peaks near 59% on the wettest days, and about 1 day brings snow. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)Snow chance (%)
1598
2597
3587
4587
5586
6586
7586
8585
9585
10585
11574
12574
13574
14563
15563
16553
17552
18542
19542
20532
21531
22521
23511
24511
25501
26501
27491
28491
29480
30470

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

Most of April feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, April lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100

Wind in April

Winds average 5 mph in April.

Across April, daily wind ranges from about 5 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 30 min at the start of April to 14 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 102 minutes over April. Sunrise moves from 5:57 AM to 5:00 AM, and sunset from 6:29 PM to 7:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.55:576:29
212.65:556:30
312.65:536:32
412.75:516:33
512.85:496:35
612.85:476:36
712.95:456:38
812.95:436:39
913.05:416:41
1013.15:396:42
1113.15:376:44
1213.25:346:45
1313.25:326:47
1413.35:306:48
1513.45:286:50
1613.45:266:51
1713.55:246:52
1813.55:226:54
1913.65:216:55
2013.65:196:57
2113.75:176:58
2213.85:157:00
2313.85:137:01
2413.95:117:03
2513.95:097:04
2614.05:077:06
2714.05:057:07
2814.15:047:09
2914.15:027:10
3014.25:007:12

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 4.29 kWh/m².

For context, solar energy here swings from a low near 0.83 kWh/m² to a high of 6.16 kWh/m² in July across the year — April's 4.29 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
13.6Moderate
23.6Moderate
33.7Moderate
43.7Moderate
53.8Moderate
63.8Moderate
73.9Moderate
83.9Moderate
94.0Moderate
104.0Bright
114.0Bright
124.1Bright
134.2Bright
144.2Bright
154.3Bright
164.3Bright
174.4Bright
184.4Bright
194.5Bright
204.5Bright
214.6Bright
224.6Bright
234.7Bright
244.7Bright
254.8Bright
264.8Bright
274.9Bright
284.9Bright
294.9Bright
305.0Bright
Planning a trip in April

Hazard calendar for Arlington

In seasonPeak

In April, Arlington sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Arlington's rainy season runs October–April, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is April a good time to visit Arlington?

Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

3.2
Sightseeing
7th-best month of the year
0.0
Beach & pool
7th-best month of the year

April is a weaker month for outdoor sightseeing in Arlington.

What to pack for Arlington in April

From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In April, Arlington sees daytime highs around 56°F and nights near 42°F. Pack rain gear. Worth having: a warm layer. About 16 days see rain.

rain geara warm layer

Sea temperature near Arlington in April

The nearest coast averages about 48°F in April — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 35 mi away) is warmest in August at about 53°F and coldest in February near 46°F.

The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.

45°50°55°JanFebMarAprMayJunJulAugSepOctNovDecbracing
Sea temperature (°F)Comfort
Jan46Bracing
Feb46Bracing
Mar47Bracing
Apr48Bracing
May50Bracing
Jun52Bracing
Jul53Bracing
Aug53Bracing
Sep53Bracing
Oct50Bracing
Nov49Bracing
Dec47Bracing

UV index in Arlington in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Arlington peaks around July 17 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 18 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 17UV 8Dec 18UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar4Moderate
Apr5Moderate
May7High
Jun6High
Jul8Very high
Aug6High
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Arlington in April

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where April falls, not just the annual average.

Air quality in Arlington is worst in August — around 20 µg/m³ PM2.5 (moderate), about 3.1× the cleanest month (December, 6 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodGoodModerateGoodModerateGoodAug 2119 µg/m³Dec 157 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb10Good
Mar12Moderate
Apr12Good
May13Moderate
Jun11Good
Jul10Good
Aug20Moderate
Sep18Moderate
Oct11Good
Nov7Good
Dec6Good
Location & terrain

Where is Arlington?

Arlington sits at 48.2°N, 122.1°W, 115 ft above sea level, in United States. The nearest listed city is Marysville, 11 mi away.

Topography around Arlington

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Arlington.

Within 2 miles, the terrain around Arlington has only modest variations in elevation — a maximum elevation change of 479 ft around an average of 157 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,297 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 10,755 ft.

The land around Arlington is covered by trees (51%) and grassland (32%) within 2 miles, trees (76%) within 10 miles, and trees (66%) and water (21%) within 50 miles.

2 miles
479 ft
10 miles
3,297 ft
50 miles
10,755 ft
treesgrasslandcroplandartificial surfacesbare terrainsnow and icewater
April weather nearby: Marysville 11 mi · Lake Stevens 13 mi · West Lake Stevens 14 mi · Everett 16 mi · Mount Vernon 18 mi · Mukilteo 19 mi · Eastmont 21 mi · Silver Firs 23 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Arlington (48.1987°, -122.1251°, elevation 115 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).