Morrisville weather in August

In August, Morrisville sees average daytime highs of 87°F and overnight lows near 70°F, with 4.4 in of rain across 12.4 wet days and about 13.4 hours of daylight. It is the 2nd-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 87°F through the month. The sky is clear or mostly clear about 29% of the time in August, and the air most often feels oppressive.

Daylight stretches from about 13 h 48 min at the start of August to 12 h 48 min by month's end. Set against the rest of the year, August is Morrisville's 10th-clearest and 12th-windiest month. For the whole year in context, see Morrisville's year-round climate.

Daytime high
87°
2nd warmest
Overnight low
70°
11th coldest
Rainfall
4.4 in
12.4 wet days
Daylight
13 h 24 min
5:38 AM – 7:00 PM
Cloud cover
59%
10th clearest
Wind
5 mph
12th windiest
Solar energy
5.36 kWh/m²
Travel score
4.5
out of 10

Morrisville is town in Wake County, North Carolina, United States.

Density
1,062/km²
people per km²
Founded
1852

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 87°F through the month.

A typical August day in Morrisville reaches about 87°F in the afternoon and slips back to 70°F overnight — a 16°F spread between the day's warmth and the night's chill. On most days the high lands between 80°F and 93°F. Set against its neighbours, August runs about 2°F cooler than July and about 6°F warmer than September.

60°70°80°90°100°151015202531
Avg high (°F)Avg low (°F)
18872
28872
38871
48871
58871
68771
78771
88771
98771
108771
118771
128771
138771
148771
158771
168771
178770
188770
198770
208770
218670
228670
238670
248670
258669
268669
278669
288669
298569
308569
318568

How August really feels in Morrisville

Once humidity and wind are folded in, August averages 22 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
22
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

The story in August is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Morrisville weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan51° / 34°3.79.31.29.82.7
Feb55° / 36°3.291.310.63.4
Mar62° / 42°4.110.40.511.75.4
Apr72° / 51°3.59.1012.96.8
May79° / 60°3.510.4013.96.6
Jun86° / 68°4.112.1014.44.8
Jul89° / 72°4.615.2014.23.7
Aug87° / 70°4.412.4013.44.5
Sep81° / 64°4.710.2012.26.3
Oct72° / 53°3.17.2011.17.2
Nov62° / 42°3.37.70.110.15.7
Dec54° / 37°3.69.10.69.63.4

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 29% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 23% of August, with mostly cloudy or overcast conditions the remaining 49%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14852
25050
35050
45050
55149
65149
75149
85149
95149
105149
115149
125248
135149
145149
155248
165248
175149
185149
195149
205149
215149
225149
235149
245149
255149
265149
275149
285149
295149
305149
315248

Chance of precipitation in August

Any precipitation

Morrisville gets around 4.4 in of rain over 12.4 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 41% and peaks near 49% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
149
248
347
447
546
646
745
845
944
1044
1144
1243
1343
1442
1542
1641
1741
1840
1940
2039
2138
2238
2337
2437
2536
2636
2736
2836
2936
3036
3136

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the oppressive band about 43% of days. Sticky, muggy-or-worse air turns up on roughly 78% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1141129532
2141129532
3151129522
4151230502
5151230502
6151330492
7151331482
8141331482
9141332472
10141333472
11141333462
12141334462
13141334452
14141335452
15141435442
16141435432
17141536432
18151536422
19151536412
20151637401
21161637391
22161637391
23161637381
24171737371
25181737361
26181836361
27191836351
282101935331
292101935331
302111935321
313112034311

Wind in August

Winds average 5 mph in August, the calmest month.

Across August, 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.

0246810151015202531
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
315calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 48 min at the start of August to 12 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 60 minutes over August. Sunrise moves from 5:26 AM to 5:50 AM, and sunset from 7:16 PM to 6:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.85:267:16
213.85:277:15
313.85:287:15
413.75:297:14
513.75:307:13
613.75:307:12
713.75:317:11
813.65:327:10
913.65:337:08
1013.65:347:07
1113.55:347:06
1213.55:357:05
1313.55:367:04
1413.45:377:03
1513.45:387:02
1613.45:387:00
1713.35:396:59
1813.35:406:58
1913.35:416:57
2013.25:426:55
2113.25:426:54
2213.25:436:53
2313.15:446:51
2413.15:456:50
2513.15:466:49
2613.05:466:47
2713.05:476:46
2812.95:486:45
2912.95:496:43
3012.95:506:42
3112.85:506:40

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.36 kWh/m².

For context, solar energy here swings from a low near 2.26 kWh/m² to a high of 6.17 kWh/m² in June across the year — August's 5.36 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.6Bright
45.6Bright
55.6Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.4Bright
135.4Bright
145.4Bright
155.4Bright
165.4Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.3Bright
225.3Bright
235.2Bright
245.2Bright
255.2Bright
265.1Bright
275.1Bright
285.1Bright
295.0Bright
305.0Bright
315.0Bright
Planning a trip in August

Is August a good time to visit Morrisville?

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

4.5
Sightseeing
8th-best month of the year
6.3
Beach & pool
3rd-best month of the year

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

What to pack for Morrisville in August

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

In August, Morrisville sees daytime highs around 87°F and nights near 70°F. Pack light clothes. Worth having: rain gear and sun protection. About 12 days see rain.

light clothesrain gearsun protection

UV index in Morrisville in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Morrisville peaks around July 13 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 2 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJul 13UV 9Dec 20UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr7High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep7High
Oct5Moderate
Nov3Moderate
Dec2Moderate

Air quality in Morrisville 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 Morrisville is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (November, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1718 µg/m³Nov 238 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb10Good
Mar12Moderate
Apr12Moderate
May13Moderate
Jun16Moderate
Jul18Moderate
Aug16Moderate
Sep12Good
Oct9Good
Nov8Good
Dec8Good
Location & terrain

Where is Morrisville?

Morrisville sits at 35.8°N, 78.8°W, 302 ft above sea level, in United States. The nearest listed city is Cary, 3.1 mi away.

Topography around Morrisville

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

Within 2 miles, the terrain around Morrisville has only modest variations in elevation — a maximum elevation change of 220 ft around an average of 348 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 617 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,122 ft.

The land around Morrisville is covered by trees (56%) and artificial surfaces (27%) within 2 miles, trees (72%) within 10 miles, and trees (76%) within 50 miles.

2 miles
220 ft
10 miles
617 ft
50 miles
1,122 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Cary 3.1 mi · Apex 6.2 mi · West Raleigh 9.3 mi · Raleigh 11 mi · Holly Springs 12 mi · Durham 12 mi · Garner 14 mi · Chapel Hill 14 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 Morrisville (35.8235°, -78.8256°, elevation 302 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).