Grand Island weather in August

In August, Grand Island sees average daytime highs of 76°F and overnight lows near 65°F, with 3.4 in of rain across 11 wet days and about 13.8 hours of daylight. It is the 2nd-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 76°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 24 min at the start of August to 13 h 06 min by month's end. Set against the rest of the year, August is Grand Island's 1st-clearest and 12th-windiest month. For the whole year in context, see Grand Island's year-round climate.

Daytime high
76°
2nd warmest
Overnight low
65°
11th coldest
Rainfall
3.4 in
11 wet days
Daylight
13 h 48 min
5:27 AM – 7:13 PM
Cloud cover
52%
1st clearest
Wind
7 mph
12th windiest
Solar energy
5.35 kWh/m²
Travel score
6.8
out of 10

Grand Island is town in New York.

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 76°F through the month.

A typical August day in Grand Island reaches about 76°F in the afternoon and slips back to 65°F overnight — a 12°F spread between the day's warmth and the night's chill. On most days the high lands between 70°F and 82°F. Set against its neighbours, August runs on par with July and about 6°F warmer than September.

50°60°70°80°151015202531
Avg high (°F)Avg low (°F)
17866
27866
37766
47766
57766
67766
77766
87766
97765
107765
117765
127765
137765
147665
157665
167665
177665
187665
197665
207664
217664
227664
237664
247664
257564
267564
277564
287563
297563
307563
317463

How August really feels in Grand Island

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.

Grand Island weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan31° / 21°2.912.5109.20.0
Feb32° / 21°2.310.27.910.20.0
Mar40° / 28°2.911.45.611.60.2
Apr51° / 39°3.712.21.913.12.5
May64° / 50°3.412.4014.45.2
Jun73° / 61°3.912.3015.16.5
Jul78° / 66°4.012.6014.86.5
Aug76° / 65°3.411013.86.8
Sep70° / 58°3.410.4012.36.5
Oct58° / 47°3.712.60.110.84.0
Nov46° / 37°3.111.83.19.51.3
Dec37° / 28°3.112.87.48.90.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in August, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 24% of August, with mostly cloudy or overcast conditions the remaining 39%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16040
26139
36139
46238
56238
66238
76238
86238
96238
106337
116238
126238
136337
146238
156238
166139
176238
186139
196139
206040
216040
225941
235941
245842
255842
265842
275842
285941
295842
305842
315842

Chance of precipitation in August

Any precipitation

Grand Island gets around 3.4 in of rain over 11 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 36% and peaks near 41% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
141
241
341
440
540
640
739
839
939
1039
1139
1238
1338
1438
1538
1637
1737
1836
1936
2035
2135
2234
2333
2433
2532
2631
2731
2831
2931
3031
3131

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 33% 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 (%)
1102034279
2102034279
3102034279
4102134269
5102134269
6102133269
7112133268
8112233268
9112233268
10122333257
11122333257
12122333256
13122433256
14122433255
15122434255
16132434254
17132434254
18132434244
19132534243
20142534243
21142534243
22152533243
23152533243
24162632233
25172631233
26172631233
27182730223
28182729223
29192729213
30202828213
31212827203

Wind in August

Winds average 7 mph in August, the calmest month.

Across August, daily wind ranges from about 7 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247light breeze
257light breeze
268light breeze
278light breeze
288light breeze
298light breeze
308light breeze
318light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 24 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 78 minutes over August. Sunrise moves from 5:10 AM to 5:44 AM, and sunset from 7:34 PM to 6:48 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.45:107:34
214.45:117:32
314.35:127:31
414.35:137:30
514.25:157:29
614.25:167:27
714.25:177:26
814.15:187:25
914.15:197:23
1014.05:207:22
1114.05:217:21
1213.95:227:19
1313.95:237:18
1413.95:247:16
1513.85:267:15
1613.85:277:13
1713.75:287:12
1813.75:297:10
1913.65:307:09
2013.65:317:07
2113.65:327:05
2213.55:337:04
2313.55:357:02
2413.45:367:00
2513.45:376:59
2613.35:386:57
2713.35:396:55
2813.25:406:54
2913.25:416:52
3013.15:426:50
3113.15:446:48

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.35 kWh/m².

For context, solar energy here swings from a low near 1.28 kWh/m² to a high of 6.33 kWh/m² in June across the year — August's 5.35 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.7Bright
45.7Bright
55.7Bright
65.7Bright
75.6Bright
85.6Bright
95.6Bright
105.5Bright
115.5Bright
125.5Bright
135.4Bright
145.4Bright
155.4Bright
165.3Bright
175.3Bright
185.3Bright
195.2Bright
205.2Bright
215.2Bright
225.2Bright
235.1Bright
245.1Bright
255.0Bright
265.0Bright
275.0Bright
284.9Bright
294.9Bright
304.9Bright
314.8Bright
Planning a trip in August

Is August a good time to visit Grand Island?

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

6.8
Sightseeing
1st-best month of the year
6.0
Beach & pool
1st-best month of the year

August is a reasonable time to visit Grand Island for sightseeing.

What to pack for Grand Island in August

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

In August, Grand Island sees daytime highs around 76°F and nights near 65°F. Worth packing: light clothes, rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

Sea temperature near Grand Island 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 14 mi away) is warmest in August at about 74°F and coldest in February near 34°F.

It's comfortable for a long swim from Jul 4 to Sep 20 — about 2.6 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan37Bracing
Feb34Bracing
Mar34Bracing
Apr38Bracing
May48Bracing
Jun62Cool
Jul72Refreshing
Aug74Refreshing
Sep69Refreshing
Oct60Cool
Nov50Bracing
Dec43Bracing

UV index in Grand Island 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 Grand Island peaks around June 20 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 20UV 8Dec 21UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar4Moderate
Apr5High
May7High
Jun8Very high
Jul8Very high
Aug6High
Sep6High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Grand Island?

Grand Island sits at 43.0°N, 79.0°W, 584 ft above sea level, in United States. The nearest listed city is North Tonawanda, 5.0 mi away.

Topography around Grand Island

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

Within 2 miles, the terrain around Grand Island has only modest variations in elevation — a maximum elevation change of 108 ft around an average of 594 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 459 ft; within 50 miles, large variations in elevation — a maximum elevation change of 1,985 ft.

The land around Grand Island is covered by trees (55%) and grassland (34%) within 2 miles, trees (35%), grassland (26%) and artificial surfaces (20%) within 10 miles, and water (40%) and trees (31%) within 50 miles.

2 miles
108 ft
10 miles
459 ft
50 miles
1,985 ft
treesgrasslandcroplandartificial surfaceswater
August weather nearby: North Tonawanda 5.0 mi · Niagara Falls 6.2 mi · Kenmore 6.8 mi · Niagara Falls 6.8 mi · Amherst 9.3 mi · Fort Erie 9.3 mi · Eggertsville 9.3 mi · Buffalo 11 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 Grand Island (43.0331°, -78.9625°, elevation 584 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. 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).