Guilford weather in August

In August, Guilford sees average daytime highs of 77°F and overnight lows near 68°F, with 3.9 in of rain across 9.2 wet days and about 13.7 hours of daylight. It is the 2nd-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 77°F through the month. The sky is clear or mostly clear about 38% 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 Guilford's 3rd-clearest and 11th-windiest month. For the whole year in context, see Guilford's year-round climate.

Daytime high
77°
2nd warmest
Overnight low
68°
11th coldest
Rainfall
3.9 in
9.2 wet days
Daylight
13 h 42 min
5:05 AM – 6:45 PM
Cloud cover
53%
3rd clearest
Wind
9 mph
11th windiest
Solar energy
5.5 kWh/m²
Travel score
7.1
out of 10

Guilford is town in New Haven County, Connecticut, United States.

Founded
1639

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 77°F through the month.

A typical August day in Guilford reaches about 77°F in the afternoon and slips back to 68°F overnight — a 8°F spread between the day's warmth and the night's chill. On most days the high lands between 72°F and 82°F. Set against its neighbours, August runs on par with July and about 5°F warmer than September.

60°70°80°151015202531
Avg high (°F)Avg low (°F)
17870
27870
37869
47869
57869
67869
77869
87769
97769
107769
117769
127769
137769
147769
157769
167769
177768
187668
197668
207668
217668
227668
237668
247668
257667
267667
277667
287567
297567
307567
317567

How August really feels in Guilford

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.

Guilford weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan37° / 28°3.99.94.69.40.0
Feb38° / 28°3.58.94.210.30.0
Mar43° / 34°4.810.53.311.70.5
Apr52° / 43°4.211.10.513.12.7
May61° / 52°3.510.9014.35.0
Jun71° / 62°3.79.8014.96.6
Jul77° / 69°3.19014.77.0
Aug77° / 68°3.99.2013.77.1
Sep71° / 63°4.18.7012.36.9
Oct62° / 53°4.89.70.110.95.3
Nov52° / 43°4.09.30.59.72.7
Dec43° / 34°5.110.939.10.5

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 38% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 18% of August, with mostly cloudy or overcast conditions the remaining 44%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15743
25743
35842
45743
55644
65644
75545
85545
95446
105446
115446
125347
135347
145347
155347
165446
175446
185545
195545
205644
215743
225743
235842
245941
255941
265941
275941
285941
295941
305941
315842

Chance of precipitation in August

Any precipitation

Guilford gets around 3.9 in of rain over 9.2 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 30% and peaks near 33% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
130
230
330
430
531
631
731
832
932
1033
1133
1233
1333
1433
1533
1633
1733
1832
1931
2030
2129
2228
2328
2427
2526
2626
2725
2825
2925
3025
3125

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 32% of days. Sticky, muggy-or-worse air turns up on roughly 49% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1313253622
2314253622
3314263522
4414263522
5414263422
6414263422
7414263422
8414263422
9514263421
10514263421
11514263420
12614263420
13614263419
14614263419
15614273418
16714273418
17715273417
18715283316
19815283316
20816283315
21816293214
22917293114
23918293113
241018293013
251019292912
261120292812
271120292812
281221292711
291321292711
301322282611
311422282610

Wind in August

Winds average 9 mph in August.

Across August, daily wind ranges from about 8 mph on the calmest days to 9 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
18light breeze
28light breeze
38light breeze
48light breeze
58light breeze
68light breeze
78light breeze
88light breeze
98light breeze
108light breeze
118light breeze
128light breeze
138light breeze
148light breeze
158light breeze
168light breeze
179light breeze
189light breeze
199light breeze
209light breeze
219light breeze
229light breeze
239light breeze
249light breeze
259light breeze
269light breeze
279light breeze
289light breeze
299light breeze
309light breeze
319light breeze

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 4:50 AM to 5:20 AM, and sunset from 7:04 PM to 6:21 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.24:507:04
214.24:517:03
314.24:527:02
414.14:537:01
514.14:546:59
614.14:556:58
714.04:566:57
814.04:576:56
913.94:586:54
1013.94:596:53
1113.95:006:52
1213.85:016:51
1313.85:026:49
1413.85:036:48
1513.75:046:46
1613.75:056:45
1713.65:066:43
1813.65:076:42
1913.55:086:40
2013.55:096:39
2113.55:106:37
2213.45:116:36
2313.45:126:34
2413.35:136:33
2513.35:146:31
2613.25:156:29
2713.25:166:28
2813.15:176:26
2913.15:186:25
3013.15:196:23
3113.05:206:21

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.5 kWh/m².

For context, solar energy here swings from a low near 1.72 kWh/m² to a high of 6.26 kWh/m² in June across the year — August's 5.5 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.9Bright
25.8Bright
35.8Bright
45.8Bright
55.8Bright
65.7Bright
75.7Bright
85.7Bright
95.7Bright
105.6Bright
115.6Bright
125.5Bright
135.5Bright
145.5Bright
155.5Bright
165.4Bright
175.4Bright
185.4Bright
195.4Bright
205.3Bright
215.3Bright
225.3Bright
235.3Bright
245.3Bright
255.3Bright
265.2Bright
275.2Bright
285.2Bright
295.1Bright
305.1Bright
315.0Bright
Planning a trip in August

Hazard calendar for Guilford

In seasonPeak

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

Guilford 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 Guilford?

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

7.1
Sightseeing
1st-best month of the year
6.3
Beach & pool
2nd-best month of the year

August is one of the better times to visit Guilford for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Guilford in August

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

In August, Guilford sees daytime highs around 77°F and nights near 68°F. Worth packing: light clothes, rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

Sea temperature near Guilford in August

The nearest coast averages about 72°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 12 mi away) is warmest in August at about 72°F and coldest in February near 36°F.

It's comfortable for a long swim from Jul 8 to Sep 25 — about 2.6 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°F)Comfort
Jan40Bracing
Feb36Bracing
Mar38Bracing
Apr44Bracing
May53Bracing
Jun63Cool
Jul70Refreshing
Aug72Refreshing
Sep70Refreshing
Oct64Cool
Nov55Bracing
Dec47Bracing

UV index in Guilford 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 Guilford peaks around July 11 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 22 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJul 11UV 8Dec 22UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May7Very high
Jun8Very high
Jul8Very high
Aug6High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Guilford 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 Guilford is worst in July — around 20 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (November, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1120 µg/m³Nov 188 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar14Moderate
Apr16Moderate
May19Moderate
Jun20Moderate
Jul20Moderate
Aug17Moderate
Sep13Moderate
Oct9Good
Nov8Good
Dec9Good
Location & terrain

Where is Guilford?

Guilford sits at 41.3°N, 72.7°W, 46 ft above sea level, in United States. The nearest listed city is Madison, 4.3 mi away.

Topography around Guilford

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

Within 2 miles, the terrain around Guilford has only modest variations in elevation — a maximum elevation change of 233 ft around an average of 69 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 764 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,680 ft.

The land around Guilford is covered by trees (69%) within 2 miles, trees (52%) and water (40%) within 10 miles, and trees (56%) and water (36%) within 50 miles.

2 miles
233 ft
10 miles
764 ft
50 miles
1,680 ft
treesgrasslandcroplandartificial surfaceswaterwetland
August weather nearby: Madison 4.3 mi · Branford 6.8 mi · East Haven 9.9 mi · North Haven 12 mi · New Haven 13 mi · Wallingford Center 13 mi · Hamden 14 mi · Wallingford 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 Guilford (41.289°, -72.6818°, elevation 46 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).