Northglenn weather in August

In August, Northglenn sees average daytime highs of 84°F and overnight lows near 57°F, with 1.6 in of rain across 7.3 wet days and about 13.6 hours of daylight. It is the 2nd-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 84°F through the month. The sky is clear or mostly clear about 42% of the time in August, and the air most often feels dry.

Daylight stretches from about 14 h 06 min at the start of August to 13 hours by month's end. Set against the rest of the year, August is Northglenn's 6th-clearest and 12th-windiest month. For the whole year in context, see Northglenn's year-round climate.

Daytime high
84°
2nd warmest
Overnight low
57°
11th coldest
Rainfall
1.6 in
7.3 wet days
Daylight
13 h 36 min
5:16 AM – 6:52 PM
Cloud cover
48%
6th clearest
Wind
4 mph
12th windiest
Solar energy
6.52 kWh/m²
Travel score
6.1
out of 10

Northglenn is city in Adams and Weld counties in Colorado, United States.

Density
2,032/km²
people per km²
Founded
1969

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 84°F through the month.

A typical August day in Northglenn reaches about 84°F in the afternoon and slips back to 57°F overnight — a 27°F spread between the day's warmth and the night's chill. On most days the high lands between 75°F and 92°F. Set against its neighbours, August runs about 2°F cooler than July and about 7°F warmer than September.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
18559
28559
38559
48559
58559
68558
78558
88558
98558
108558
118458
128458
138458
148458
158457
168457
178457
188457
198457
208457
218457
228457
238457
248456
258456
268356
278356
288356
298356
308355
318255

How August really feels in Northglenn

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.

Northglenn weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan41° / 18°0.84.74.89.50.2
Feb44° / 20°0.85.65.510.41.0
Mar54° / 27°1.77.6511.73.5
Apr60° / 34°2.79.94.3134.9
May69° / 44°3.311.90.714.26.1
Jun80° / 53°2.19.2014.86.6
Jul86° / 59°1.78.5014.55.2
Aug84° / 57°1.67.3013.66.1
Sep77° / 49°1.56.10.412.37.6
Oct64° / 37°1.66.32.110.96.4
Nov51° / 26°1.15.84.69.82.9
Dec41° / 18°0.84.64.79.20.3

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 42% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 26% of August, with mostly cloudy or overcast conditions the remaining 31%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16238
26337
36337
46436
56535
66535
76733
86733
96733
106832
116931
126931
136931
146931
157030
167030
177030
187030
197030
207030
217030
227030
237030
247030
257030
267129
277129
287129
297228
307228
317228

Chance of precipitation in August

Any precipitation

Northglenn gets around 1.6 in of rain over 7.3 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 23% and peaks near 30% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
130
230
329
429
528
628
727
827
927
1026
1125
1225
1324
1423
1523
1622
1721
1821
1920
2020
2120
2219
2319
2418
2518
2618
2717
2817
2917
3017
3118

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 86% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
173243
273243
374242
474242
575232
677221
777221
878211
979201
1080191
1183170
1284160
1385150
1486140
1587130
1688120
1788120
1889110
1990100
2090100
219190
229280
239280
249370
259370
269370
279460
289460
299550
309550
319550

Wind in August

Winds average 4 mph in August, the calmest month.

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 06 min at the start of August to 13 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over August. Sunrise moves from 5:02 AM to 5:31 AM, and sunset from 7:10 PM to 6:29 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.15:027:10
214.15:037:09
314.15:047:08
414.05:057:07
514.05:067:06
614.05:077:04
713.95:087:03
813.95:097:02
913.95:107:01
1013.85:117:00
1113.85:126:58
1213.75:136:57
1313.75:146:56
1413.75:156:54
1513.65:156:53
1613.65:166:52
1713.55:176:50
1813.55:186:49
1913.55:196:47
2013.45:206:46
2113.45:216:44
2213.35:226:43
2313.35:236:41
2413.35:246:40
2513.25:256:38
2613.25:266:37
2713.15:276:35
2813.15:286:34
2913.15:296:32
3013.05:306:31
3113.05:316:29

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 6.52 kWh/m².

For context, solar energy here swings from a low near 2.49 kWh/m² to a high of 7.42 kWh/m² in June across the year — August's 6.52 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.8Intense
26.8Intense
36.8Intense
46.8Intense
56.8Intense
66.7Intense
76.7Intense
86.7Intense
96.7Intense
106.7Intense
116.7Intense
126.7Intense
136.6Intense
146.6Intense
156.6Intense
166.6Intense
176.5Intense
186.5Intense
196.5Intense
206.5Intense
216.4Intense
226.4Intense
236.4Intense
246.3Intense
256.3Intense
266.3Intense
276.2Intense
286.2Intense
296.2Intense
306.1Intense
316.1Intense
Planning a trip in August

Is August a good time to visit Northglenn?

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

6.1
Sightseeing
4th-best month of the year
7.6
Beach & pool
1st-best month of the year

August is a reasonable time to visit Northglenn for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Northglenn in August

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

In August, Northglenn sees daytime highs around 84°F and nights near 57°F. Pack light clothes and sun protection. About 7 days see rain.

light clothessun protection

UV index in Northglenn in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Northglenn peaks around July 12 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJul 12UV 11Dec 23UV 2
UV index (midday)Level
Jan2Low
Feb4Moderate
Mar7High
Apr6High
May7Very high
Jun10Extreme
Jul11Extreme
Aug10Very high
Sep7Very high
Oct5High
Nov3Moderate
Dec2Low

Air quality in Northglenn 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 Northglenn is worst in August — around 21 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (May, 13 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateAug 1620 µg/m³May 1113 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb15Moderate
Mar16Moderate
Apr13Moderate
May13Moderate
Jun14Moderate
Jul14Moderate
Aug21Moderate
Sep13Moderate
Oct15Moderate
Nov15Moderate
Dec16Moderate
Location & terrain

Where is Northglenn?

Northglenn sits at 39.9°N, 105.0°W, 5,377 ft above sea level, in United States. The nearest listed city is Thornton, 1.2 mi away.

Topography around Northglenn

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

Within 2 miles, the terrain around Northglenn has only modest variations in elevation — a maximum elevation change of 394 ft around an average of 5,364 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 951 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 9,708 ft.

The land around Northglenn is covered by artificial surfaces (66%) within 2 miles, artificial surfaces (42%) and grassland (36%) within 10 miles, and grassland (42%) and trees (31%) within 50 miles.

2 miles
394 ft
10 miles
951 ft
50 miles
9,708 ft
treesgrasslandcroplandartificial surfacesbare terrainwatermoss and lichen
August weather nearby: Thornton 1.2 mi · Sherrelwood 3.1 mi · Westminster 4.3 mi · Broomfield 5.6 mi · Commerce City 6.2 mi · Arvada 8.1 mi · Lafayette 9.3 mi · Wheat Ridge 9.3 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 Northglenn (39.8855°, -104.9872°, elevation 5,377 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).