New Haven weather in August

In August, New Haven sees average daytime highs of 81°F and overnight lows near 63°F, with 3.4 in of rain across 10.1 wet days and about 13.6 hours of daylight. It is the 2nd-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 81°F through the month. The sky is clear or mostly clear about 36% of the time in August, and the air most often feels humid.

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 New Haven's 2nd-clearest and 12th-windiest month. For the whole year in context, see New Haven's year-round climate.

Daytime high
81°
2nd warmest
Overnight low
63°
11th coldest
Rainfall
3.4 in
10.1 wet days
Daylight
13 h 42 min
5:54 AM – 7:34 PM
Cloud cover
55%
2nd clearest
Wind
6 mph
12th windiest
Solar energy
5.48 kWh/m²
Travel score
6.5
out of 10

New Haven is city in Indiana.

Density
614/km²
people per km²
Founded
1839

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 81°F through the month.

A typical August day in New Haven reaches about 81°F in the afternoon and slips back to 63°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 73°F and 88°F. Set against its neighbours, August runs about 2°F cooler than July and about 6°F warmer than September.

50°60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18265
28265
38264
48264
58264
68264
78264
88264
98264
108164
118164
128164
138164
148163
158163
168163
178163
188163
198163
208163
218163
228163
238163
248062
258062
268062
278062
288062
298062
308061
318061

How August really feels in New Haven

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.

New Haven 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
Jan33° / 20°2.810.25.99.40.0
Feb37° / 23°2.38.24.710.40.0
Mar48° / 31°3.310.63.111.71.7
Apr61° / 41°4.012.10.613.14.6
May71° / 52°4.113.1014.36.0
Jun80° / 62°4.012014.96.2
Jul83° / 65°3.411.1014.75.8
Aug81° / 63°3.410.1013.66.5
Sep75° / 56°2.58.2012.37.1
Oct63° / 45°2.990.210.95.6
Nov49° / 35°3.19.31.49.72.1
Dec38° / 26°2.79.74.19.10.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% 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 44%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15545
25644
35644
45644
55644
65545
75545
85545
95545
105545
115446
125545
135545
145545
155545
165545
175545
185644
195644
205644
215644
225644
235743
245644
255644
265743
275842
285842
295842
305842
315842

Chance of precipitation in August

Any precipitation

New Haven gets around 3.4 in of rain over 10.1 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 32% and peaks near 34% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
133
232
332
432
532
632
732
832
933
1033
1133
1234
1334
1434
1534
1634
1734
1834
1933
2033
2133
2233
2332
2432
2531
2630
2729
2828
2928
3027
3127

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 26% of days. Sticky, muggy-or-worse air turns up on roughly 35% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
110243022121
211243022121
311243022121
411253022121
512252922121
612252922111
713252822111
813252822111
913252723111
1014252723111
1114252623111
1215252624110
1315252524100
1415252525100
1515252525100
161525242690
171525242690
181525242790
191525242790
201524242880
211624242880
221623242880
231623242980
241723242870
251823242870
261923242870
272023242770
282123232760
292223232660
302323232660
312423222560

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 7 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
267calm
277calm
287calm
297calm
307calm
317calm

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 5:39 AM to 6:10 AM, and sunset from 7:53 PM to 7:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.25:397:53
214.25:407:52
314.25:417:51
414.15:427:49
514.15:437:48
614.05:447:47
714.05:457:46
814.05:467:45
913.95:477:43
1013.95:487:42
1113.95:497:41
1213.85:507:39
1313.85:517:38
1413.75:527:37
1513.75:537:35
1613.75:547:34
1713.65:567:32
1813.65:577:31
1913.55:587:29
2013.55:597:28
2113.46:007:26
2213.46:017:25
2313.46:027:23
2413.36:037:22
2513.36:047:20
2613.26:057:19
2713.26:067:17
2813.16:077:15
2913.16:087:14
3013.16:097:12
3113.06:107:10

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.48 kWh/m².

For context, solar energy here swings from a low near 1.61 kWh/m² to a high of 6.29 kWh/m² in June across the year — August's 5.48 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.8Bright
45.8Bright
55.8Bright
65.8Bright
75.7Bright
85.7Bright
95.7Bright
105.6Bright
115.6Bright
125.6Bright
135.5Bright
145.5Bright
155.5Bright
165.5Bright
175.4Bright
185.4Bright
195.4Bright
205.4Bright
215.3Bright
225.3Bright
235.3Bright
245.2Bright
255.2Bright
265.2Bright
275.2Bright
285.1Bright
295.1Bright
305.1Bright
315.0Bright
Planning a trip in August

Is August a good time to visit New Haven?

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

6.5
Sightseeing
2nd-best month of the year
6.7
Beach & pool
2nd-best month of the year

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

What to pack for New Haven in August

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

In August, New Haven sees daytime highs around 81°F and nights near 63°F. Pack light clothes. Worth having: rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

UV index in New Haven in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in New Haven peaks around June 19 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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 highHighModerateLowJun 19UV 9Dec 20UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May7Very high
Jun9Very high
Jul8Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov3Moderate
Dec1Low

Air quality in New Haven 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 New Haven is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1416 µg/m³Oct 228 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar13Moderate
Apr13Moderate
May14Moderate
Jun16Moderate
Jul16Moderate
Aug15Moderate
Sep12Good
Oct8Good
Nov9Good
Dec9Good
Location & terrain

Where is New Haven?

New Haven sits at 41.1°N, 85.0°W, 758 ft above sea level, in United States. The nearest listed city is Fort Wayne, 7.5 mi away.

Topography around New Haven

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

Within 2 miles, the terrain around New Haven has only modest variations in elevation — a maximum elevation change of 135 ft around an average of 768 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 351 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 643 ft.

The land around New Haven is covered by trees (28%), cropland (28%) and grassland (24%) within 2 miles, cropland (49%) and trees (23%) within 10 miles, and cropland (72%) within 50 miles.

2 miles
135 ft
10 miles
351 ft
50 miles
643 ft
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Fort Wayne 7.5 mi · Huntington 29 mi · Defiance 37 mi · Marion 49 mi · Lima 53 mi · Goshen 55 mi · Muncie 63 mi · Elkhart 65 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 New Haven (41.0706°, -85.0144°, elevation 758 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).