Chestnut Hill weather in August

In August, Chestnut Hill sees average daytime highs of 80°F and overnight lows near 64°F, with 3.5 in of rain across 9.6 wet days and about 13.7 hours of daylight. It is the 2nd-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 82°F in the first days to 79°F by the end. The sky is clear or mostly clear about 33% of the time in August, and the air most often feels humid.

Daylight stretches from about 14 h 18 min at the start of August to 13 h 06 min by month's end. Set against the rest of the year, August is Chestnut Hill's 3rd-clearest and 12th-windiest month. For the whole year in context, see Chestnut Hill's year-round climate.

Daytime high
80°
2nd warmest
Overnight low
64°
11th coldest
Rainfall
3.5 in
9.6 wet days
Daylight
13 h 42 min
4:57 AM – 6:41 PM
Cloud cover
56%
3rd clearest
Wind
6 mph
12th windiest
Solar energy
5.21 kWh/m²
Travel score
6.6
out of 10

Chestnut Hill is village in Massachusetts.

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 82°F in the first days to 79°F by the end.

A typical August day in Chestnut Hill reaches about 80°F in the afternoon and slips back to 64°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 72°F and 89°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)
18265
28265
38265
48265
58265
68265
78265
88265
98265
108165
118165
128165
138164
148164
158164
168164
178064
188064
198064
208063
218063
228063
238063
248063
257962
267962
277962
287962
297962
307861
317861

How August really feels in Chestnut Hill

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.

Chestnut Hill 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
Jan36° / 22°3.49.75.79.30.0
Feb38° / 23°3.08.65.110.30.0
Mar46° / 30°4.310.94.711.61.1
Apr57° / 40°3.610.9113.13.9
May67° / 50°3.010.3014.46.0
Jun76° / 59°3.410.70156.6
Jul82° / 65°3.010.5014.86.0
Aug80° / 64°3.59.6013.76.6
Sep73° / 56°3.48.1012.37.1
Oct62° / 46°3.99.40.210.85.4
Nov51° / 36°3.49.10.89.62.5
Dec41° / 28°4.210.54.690.2

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 33% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 20% of August, with mostly cloudy or overcast conditions the remaining 47%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15248
25347
35347
45248
55248
65248
75149
85149
95149
105050
114951
125050
135050
145050
155050
165149
175149
185248
195248
205347
215347
225545
235545
245644
255644
265644
275644
285644
295644
305545
315545

Chance of precipitation in August

Any precipitation

Chestnut Hill gets around 3.5 in of rain over 9.6 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 31% and peaks near 35% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
135
235
335
435
535
635
735
835
935
1035
1135
1234
1334
1434
1534
1633
1733
1832
1931
2030
2130
2229
2328
2427
2527
2626
2726
2825
2925
3025
3125

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the humid band about 28% of days. Sticky, muggy-or-worse air turns up on roughly 30% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
11419292910
21419292810
31419282810
41519292810
51519292710
61519292710
71519292610
81519292610
91520292610
101520302510
11162030259
12162130259
13162130249
14162130248
15162230248
16162331237
17162331237
18172431226
19172431226
20182530216
21192530215
22202629205
23212728205
24212727195
25222826185
26232925185
27242925175
28252924175
29262924165
30272923165
31272922165

Wind in August

Winds average 6 mph in August, the calmest month.

Across August, daily wind ranges from about 6 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 18 min at the start of August to 13 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 72 minutes over August. Sunrise moves from 4:41 AM to 5:13 AM, and sunset from 7:01 PM to 6:16 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.34:417:01
214.34:426:59
314.34:436:58
414.24:446:57
514.24:456:56
614.14:466:55
714.14:476:53
814.14:486:52
914.04:496:51
1014.04:506:49
1113.94:516:48
1213.94:526:47
1313.94:546:45
1413.84:556:44
1513.84:566:42
1613.74:576:41
1713.74:586:39
1813.64:596:38
1913.65:006:36
2013.65:016:35
2113.55:026:33
2213.55:036:31
2313.45:046:30
2413.45:066:28
2513.35:076:26
2613.35:086:25
2713.25:096:23
2813.25:106:21
2913.15:116:20
3013.15:126:18
3113.15:136:16

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.21 kWh/m².

For context, solar energy here swings from a low near 1.62 kWh/m² to a high of 5.88 kWh/m² in July across the year — August's 5.21 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.4Bright
55.4Bright
65.4Bright
75.3Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.2Bright
135.2Bright
145.2Bright
155.2Bright
165.2Bright
175.2Bright
185.1Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.1Bright
245.0Bright
255.0Bright
265.0Bright
275.0Bright
284.9Bright
294.9Bright
304.9Bright
314.8Bright
Planning a trip in August

Hazard calendar for Chestnut Hill

In seasonPeak

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

Chestnut Hill 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 Chestnut Hill?

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

6.6
Sightseeing
2nd-best month of the year
6.7
Beach & pool
2nd-best month of the year

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

What to pack for Chestnut Hill in August

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

In August, Chestnut Hill sees daytime highs around 80°F and nights near 64°F. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near Chestnut Hill in August

The nearest coast averages about 66°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 15 mi away) is warmest in August at about 66°F and coldest in February near 38°F.

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

40°50°60°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°F)Comfort
Jan41Bracing
Feb38Bracing
Mar38Bracing
Apr42Bracing
May50Bracing
Jun58Bracing
Jul65Cool
Aug66Cool
Sep63Cool
Oct56Bracing
Nov50Bracing
Dec46Bracing

UV index in Chestnut Hill in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August 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 Chestnut Hill peaks around July 10 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighHighModerateLowJul 10UV 7Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar4Moderate
Apr5High
May7Very high
Jun7Very high
Jul7Very high
Aug5Moderate
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Chestnut Hill 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 Chestnut Hill is worst in July — around 16 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (November, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1516 µg/m³Nov 189 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar14Moderate
Apr14Moderate
May15Moderate
Jun15Moderate
Jul16Moderate
Aug14Moderate
Sep12Good
Oct10Good
Nov8Good
Dec10Good
Location & terrain

Where is Chestnut Hill?

Chestnut Hill sits at 42.3°N, 71.2°W, 197 ft above sea level, in United States. The nearest listed city is Brighton, 1.2 mi away.

Topography around Chestnut Hill

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

Within 2 miles, the terrain around Chestnut Hill has only modest variations in elevation — a maximum elevation change of 358 ft around an average of 174 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 633 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,234 ft.

The land around Chestnut Hill is covered by trees (67%) and artificial surfaces (24%) within 2 miles, trees (60%) and artificial surfaces (26%) within 10 miles, and trees (65%) and water (26%) within 50 miles.

2 miles
358 ft
10 miles
633 ft
50 miles
2,234 ft
treesgrasslandartificial surfaceswaterwetland
August weather nearby: Brighton 1.2 mi · Newton 2.5 mi · Brookline 2.5 mi · Jamaica Plain 2.5 mi · Allston 3.1 mi · Watertown 3.1 mi · Mission Hill 3.1 mi · Roslindale 3.7 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 Chestnut Hill (42.3306°, -71.1662°, elevation 197 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).