Hillsborough weather in August

In August, Hillsborough sees average daytime highs of 83°F and overnight lows near 66°F, with 4.0 in of rain across 10.4 wet days and about 13.6 hours of daylight. It is the 2nd-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 85°F in the first days to 82°F by the end. The sky is clear or mostly clear about 28% of the time in August, and the air most often feels muggy.

Daylight stretches from about 14 h 12 min at the start of August to 13 hours by month's end. Set against the rest of the year, August is Hillsborough's 4th-clearest and 12th-windiest month. For the whole year in context, see Hillsborough's year-round climate.

Daytime high
83°
2nd warmest
Overnight low
66°
11th coldest
Rainfall
4.0 in
10.4 wet days
Daylight
13 h 36 min
5:14 AM – 6:51 PM
Cloud cover
59%
4th clearest
Wind
5 mph
12th windiest
Solar energy
5.19 kWh/m²
Travel score
5.8
out of 10

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 85°F in the first days to 82°F by the end.

A typical August day in Hillsborough reaches about 83°F in the afternoon and slips back to 66°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 75°F and 91°F. Set against its neighbours, August runs about 2°F cooler than July and about 7°F warmer than September.

50°60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18568
28568
38568
48568
58567
68467
78467
88467
98467
108467
118467
128467
138367
148367
158366
168366
178366
188366
198366
208366
218365
228265
238265
248265
258265
268265
278265
288264
298264
308164
318164

How August really feels in Hillsborough

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.

Hillsborough weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan39° / 25°3.39.14.39.40.0
Feb42° / 26°3.093.710.40.3
Mar50° / 33°4.210.63.311.72.2
Apr62° / 43°3.710.70.4135.0
May71° / 53°3.611.7014.26.3
Jun81° / 62°4.311.5014.86.0
Jul85° / 68°4.211.3014.65.0
Aug83° / 66°4.010.4013.65.8
Sep76° / 59°4.19.2012.36.9
Oct65° / 47°3.78.60.110.96.0
Nov53° / 38°3.07.90.59.73.2
Dec44° / 30°4.09.62.69.20.6

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 21% of August, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14852
24852
34852
44852
54753
64753
74753
84753
94753
104753
114753
124753
134753
144753
154753
164852
174852
184951
194951
205050
215149
225149
235050
245149
255149
265149
275149
285149
295149
305050
315149

Chance of precipitation in August

Any precipitation

Hillsborough gets around 4.0 in of rain over 10.4 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 34% and peaks near 38% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
138
238
337
437
537
637
737
838
938
1038
1138
1238
1338
1437
1537
1637
1736
1835
1934
2033
2132
2231
2330
2429
2528
2628
2727
2827
2927
3027
3127

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the muggy band about 28% of days. Sticky, muggy-or-worse air turns up on roughly 39% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
11117273014
21117273014
31217272914
41217272914
51217272915
61317262915
71317262915
81317262915
91316273014
101416262914
111416263014
121416263013
131416263013
141416273013
151416273012
161417272912
171517272912
181518272911
191518272811
201618272810
211719272810
221720262710
23182026279
24192125269
25202125259
26212224249
27222224249
28232223239
29232323229
30242322229
31252322219

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 14 h 12 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 72 minutes over August. Sunrise moves from 4:59 AM to 5:29 AM, and sunset from 7:10 PM to 6:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.24:597:10
214.15:007:09
314.15:017:08
414.15:027:07
514.05:037:05
614.05:047:04
714.05:057:03
813.95:067:02
913.95:077:01
1013.95:086:59
1113.85:096:58
1213.85:106:57
1313.75:116:55
1413.75:126:54
1513.75:136:53
1613.65:146:51
1713.65:156:50
1813.55:166:48
1913.55:176:47
2013.55:186:45
2113.45:196:44
2213.45:206:42
2313.35:216:41
2413.35:226:39
2513.25:236:38
2613.25:246:36
2713.25:256:35
2813.15:266:33
2913.15:276:31
3013.05:286:30
3113.05:296:28

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.19 kWh/m².

For context, solar energy here swings from a low near 1.77 kWh/m² to a high of 5.99 kWh/m² in June across the year — August's 5.19 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.5Bright
55.4Bright
65.4Bright
75.4Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.2Bright
135.2Bright
145.2Bright
155.2Bright
165.1Bright
175.1Bright
185.1Bright
195.1Bright
205.1Bright
215.0Bright
225.0Bright
235.0Bright
245.0Bright
255.0Bright
265.0Bright
274.9Bright
284.9Bright
294.9Bright
304.8Bright
314.8Bright
Planning a trip in August

Hazard calendar for Hillsborough

In seasonPeak

In August, Hillsborough sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.

Hillsborough sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is August a good time to visit Hillsborough?

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

5.8
Sightseeing
5th-best month of the year
6.8
Beach & pool
1st-best month of the year

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

What to pack for Hillsborough in August

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

In August, Hillsborough sees daytime highs around 83°F and nights near 66°F. Pack light clothes. Worth having: rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near Hillsborough in August

The nearest coast averages about 74°F in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 40 mi away) is warmest in August at about 74°F and coldest in February near 40°F.

It's comfortable for a long swim from Jun 30 to Sep 27 — about 3 months when the water holds above 68°F.

40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°F)Comfort
Jan43Bracing
Feb40Bracing
Mar41Bracing
Apr46Bracing
May55Bracing
Jun65Cool
Jul72Refreshing
Aug74Refreshing
Sep71Refreshing
Oct64Cool
Nov55Bracing
Dec49Bracing

UV index in Hillsborough 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 Hillsborough peaks around July 11 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJul 11UV 8Dec 21UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun8Very high
Jul8Very high
Aug6High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Hillsborough 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 Hillsborough is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (November, 9 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1518 µg/m³Nov 149 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb13Moderate
Mar14Moderate
Apr14Moderate
May16Moderate
Jun17Moderate
Jul18Moderate
Aug15Moderate
Sep13Moderate
Oct10Good
Nov9Good
Dec10Good
Location & terrain

Where is Hillsborough?

Hillsborough sits at 40.5°N, 74.6°W, 85 ft above sea level, in United States. The nearest listed city is Somerset, 7.5 mi away.

Topography around Hillsborough

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

Within 2 miles, the terrain around Hillsborough has only modest variations in elevation — a maximum elevation change of 161 ft around an average of 105 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 673 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,962 ft.

The land around Hillsborough is covered by trees (56%) and grassland (29%) within 2 miles, trees (64%) and grassland (22%) within 10 miles, and trees (61%) within 50 miles.

2 miles
161 ft
10 miles
673 ft
50 miles
1,962 ft
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Somerset 7.5 mi · North Brunswick 8.1 mi · Bridgewater 8.7 mi · Princeton 9.3 mi · New Brunswick 9.3 mi · Warren Township 11 mi · East Brunswick 12 mi · Edison 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 Hillsborough (40.4776°, -74.6268°, elevation 85 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).