Monroe weather in August

In August, Monroe sees average daytime highs of 74°F and overnight lows near 54°F, with 1.8 in of rain across 5.7 wet days and about 14.1 hours of daylight. It is the 1st-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 75°F in the first days to 72°F by the end. The sky is clear or mostly clear about 46% of the time in August, and the air most often feels dry.

Daylight stretches from about 14 h 48 min at the start of August to 13 h 18 min by month's end. Set against the rest of the year, August is Monroe's 1st-clearest and 11th-windiest month. For the whole year in context, see Monroe's year-round climate.

Daytime high
74°
1st warmest
Overnight low
54°
11th coldest
Rainfall
1.8 in
5.7 wet days
Daylight
14 h 06 min
5:09 AM – 7:15 PM
Cloud cover
46%
1st clearest
Wind
4 mph
11th windiest
Solar energy
5.38 kWh/m²
Travel score
7.8
out of 10

Monroe is city in Snohomish County, Washington, United States.

Density
1,144/km²
people per km²
Founded
1903

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 75°F in the first days to 72°F by the end.

A typical August day in Monroe reaches about 74°F in the afternoon and slips back to 54°F overnight — a 20°F spread between the day's warmth and the night's chill. On most days the high lands between 65°F and 83°F. Set against its neighbours, August runs on par with July and about 6°F warmer than September.

40°50°60°70°80°151015202531
Avg high (°F)Avg low (°F)
17555
27555
37555
47555
57555
67555
77555
87555
97555
107555
117555
127455
137455
147455
157455
167455
177454
187454
197454
207454
217354
227354
237353
247353
257353
267353
277253
287253
297253
307252
317252

How August really feels in Monroe

Once humidity and wind are folded in, August 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

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

Monroe weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan45° / 36°9.01948.60.8
Feb48° / 36°6.115.52.99.91.5
Mar52° / 38°7.119.12.311.62.2
Apr57° / 41°5.916.70.313.43.4
May63° / 46°4.113.2014.95.1
Jun67° / 51°3.511.4015.75.9
Jul73° / 54°1.66.3015.47.6
Aug74° / 54°1.85.7014.17.8
Sep68° / 49°3.79.2012.46.5
Oct58° / 43°7.415.3010.63.8
Nov49° / 38°9.919.10.99.11.6
Dec44° / 35°8.718.73.98.30.6

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 46% of the time in August, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 15% of August, with mostly cloudy or overcast conditions the remaining 39%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16832
26832
36634
46634
56535
66535
76337
86238
96238
106139
116139
126040
136040
145941
155941
165842
175842
185941
195941
205941
215842
225842
235842
245842
255842
265842
275842
285842
295842
305842
315941

Chance of precipitation in August

Any precipitation

Monroe gets around 1.8 in of rain over 5.7 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 18% and peaks near 25% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
113
213
314
414
514
614
715
815
915
1016
1116
1217
1317
1417
1517
1618
1718
1818
1919
2019
2120
2220
2321
2422
2522
2623
2723
2824
2924
3025
3125

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the dry band about 57% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
152426
251436
351436
451436
550446
650446
750446
849446
949456
1049457
1149447
1249447
1350437
1450437
1552426
1653416
1754406
1855396
1957385
2058375
2159365
2261354
2362344
2464333
2565323
2667312
2767312
2869301
2970291
3070291
3171281

Wind in August

Winds average 4 mph in August.

Across August, daily wind ranges from about 4 mph on the calmest days to 4 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 48 min at the start of August to 13 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 90 minutes over August. Sunrise moves from 4:49 AM to 5:30 AM, and sunset from 7:39 PM to 6:46 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.84:497:39
214.84:507:38
314.84:517:36
414.74:527:35
514.74:547:33
614.64:557:32
714.64:567:30
814.54:587:29
914.54:597:27
1014.45:007:26
1114.45:027:24
1214.35:037:22
1314.35:057:21
1414.25:067:19
1514.25:077:17
1614.15:097:15
1714.15:107:13
1814.05:117:12
1913.95:137:10
2013.95:147:08
2113.85:167:06
2213.85:177:04
2313.75:187:02
2413.75:207:00
2513.65:216:58
2613.65:236:56
2713.55:246:54
2813.45:256:52
2913.45:276:50
3013.35:286:48
3113.35:306:46

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.38 kWh/m².

For context, solar energy here swings from a low near 0.86 kWh/m² to a high of 6.13 kWh/m² in July across the year — August's 5.38 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.0Intense
26.0Intense
36.0Bright
45.9Bright
55.9Bright
65.8Bright
75.8Bright
85.8Bright
95.7Bright
105.7Bright
115.6Bright
125.6Bright
135.5Bright
145.5Bright
155.5Bright
165.4Bright
175.4Bright
185.3Bright
195.3Bright
205.2Bright
215.2Bright
225.1Bright
235.1Bright
245.0Bright
255.0Bright
265.0Bright
274.9Bright
284.9Bright
294.8Bright
304.8Bright
314.7Bright
Planning a trip in August

Hazard calendar for Monroe

In seasonPeak

None of Monroe's seasonal hazards are active in August. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Monroe'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 August a good time to visit Monroe?

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

7.8
Sightseeing
1st-best month of the year
6.2
Beach & pool
1st-best month of the year

August is one of the better times to visit Monroe for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Monroe in August

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

In August, Monroe sees daytime highs around 74°F and nights near 54°F. Worth packing: light clothes and sun protection. About 6 days see rain.

light clothessun protection

UV index in Monroe in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Monroe 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 Monroe in August

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Monroe 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 Monroe?

Monroe sits at 47.9°N, 122.0°W, 72 ft above sea level, in United States. The nearest listed city is Silver Firs, 8.7 mi away.

Topography around Monroe

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

Within 2 miles, the terrain around Monroe has only modest variations in elevation — a maximum elevation change of 600 ft around an average of 138 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,808 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 10,427 ft.

The land around Monroe is covered by trees (49%) and grassland (28%) within 2 miles, trees (77%) within 10 miles, and trees (74%) within 50 miles.

2 miles
600 ft
10 miles
2,808 ft
50 miles
10,427 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Silver Firs 8.7 mi · Cottage Lake 9.3 mi · North Creek 9.9 mi · Mill Creek East 9.9 mi · Eastmont 9.9 mi · Mill Creek 11 mi · West Lake Stevens 11 mi · Lake Stevens 12 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 Monroe (47.8554°, -121.971°, elevation 72 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. 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).