Grand Island weather in September

In September, Grand Island sees average daytime highs of 77°F and overnight lows near 55°F, with 2.4 in of rain across 7.1 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 82°F in the first days to 73°F by the end. The sky is clear or mostly clear about 56% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Grand Island's 1st-clearest and 5th-windiest month. For the whole year in context, see Grand Island's year-round climate.

Daytime high
77°
4th warmest
Overnight low
55°
9th coldest
Rainfall
2.4 in
7.1 wet days
Daylight
12 h 18 min
6:20 AM – 6:36 PM
Cloud cover
38%
1st clearest
Wind
10 mph
5th windiest
Solar energy
4.92 kWh/m²
Travel score
7.5
out of 10

Grand Island is city in and county seat of Hall County, Nebraska, United States.

Founded
1857

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 82°F in the first days to 73°F by the end.

A typical September day in Grand Island reaches about 77°F in the afternoon and slips back to 55°F overnight — a 23°F spread between the day's warmth and the night's chill. On most days the high lands between 64°F and 89°F. Set against its neighbours, September runs about 7°F cooler than August and about 13°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18361
28260
38260
48260
58159
68159
78158
88058
98058
107957
117957
127956
137856
147855
157755
167755
177754
187654
197653
207653
217552
227552
237451
247451
257450
267350
277349
287349
297249
307248

How September really feels in Grand Island

Once humidity and wind are folded in, September 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

September 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 September compares with the rest of the year at a glance. September is the 4th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan35° / 16°0.843.69.40.0
Feb40° / 19°0.94.33.410.40.1
Mar51° / 29°2.06.92.511.72.7
Apr61° / 39°3.49.61.413.15.2
May71° / 51°5.112.30.114.36.3
Jun82° / 62°4.110.3014.96.1
Jul86° / 66°3.09014.65.2
Aug84° / 64°3.08.9013.65.9
Sep77° / 55°2.47.1012.37.5
Oct64° / 41°2.56.70.710.96.3
Nov49° / 29°1.34.91.99.72.5
Dec38° / 19°1.04.23.49.10.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 56% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 30%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17228
27228
37228
47129
57129
67129
77030
87030
97030
106931
116931
126832
136832
146832
156733
166832
176832
186832
196931
206931
216931
227129
237129
247129
257129
267030
277030
287030
297030
307030

Chance of precipitation in September

Any precipitation

Grand Island gets around 2.4 in of rain over 7.1 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 24% and peaks near 25% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
124
224
324
424
524
624
724
824
925
1025
1125
1225
1325
1425
1525
1625
1725
1825
1924
2024
2124
2223
2323
2423
2523
2623
2724
2824
2924
3024

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 56% of days. Sticky, muggy-or-worse air turns up on roughly 8% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1242430211
2262430191
3292429171
4312528161
5342527140
6362526130
7392425120
8412424110
9442323100
1046232290
1148222180
1250222080
1353211970
1454211870
1557201760
1659191660
1759191660
1862181550
1964171450
2066161350
2169151240
2271141140
2373131040
247612930
257712830
267811830
278110720
288210620
298310610
30859510

Wind in September

Winds average 10 mph in September.

Across September, daily wind ranges from about 9 mph on the calmest days to 10 mph at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (mph)Feels
19light breeze
29light breeze
39light breeze
49light breeze
59light breeze
610light breeze
710light breeze
810light breeze
910light breeze
1010light breeze
1110light breeze
1210light breeze
1310light breeze
1410light breeze
1510light breeze
1610light breeze
1710light breeze
1810light breeze
1910light breeze
2010light breeze
2110light breeze
2210light breeze
2310light breeze
2410light breeze
2510light breeze
2610light breeze
2710light breeze
2810light breeze
2910light breeze
3010light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 hours at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over September. Sunrise moves from 6:04 AM to 6:34 AM, and sunset from 7:02 PM to 6:11 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.06:047:02
212.96:057:00
312.96:066:58
412.86:076:57
512.86:086:55
612.76:096:53
712.76:106:52
812.66:126:50
912.66:136:48
1012.56:146:46
1112.56:156:45
1212.56:166:43
1312.46:176:41
1412.46:186:39
1512.36:196:37
1612.36:206:36
1712.26:216:34
1812.26:226:32
1912.16:236:30
2012.16:246:29
2112.06:256:27
2212.06:266:25
2311.96:276:23
2411.96:286:22
2511.86:296:20
2611.86:306:18
2711.86:316:16
2811.76:326:15
2911.76:336:13
3011.66:346:11

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.92 kWh/m².

For context, solar energy here swings from a low near 2.07 kWh/m² to a high of 6.79 kWh/m² in June across the year — September's 4.92 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.4Bright
45.4Bright
55.3Bright
65.3Bright
75.3Bright
85.2Bright
95.2Bright
105.1Bright
115.1Bright
125.0Bright
135.0Bright
144.9Bright
154.9Bright
164.8Bright
174.8Bright
184.8Bright
194.7Bright
204.7Bright
214.6Bright
224.6Bright
234.6Bright
244.5Bright
254.5Bright
264.4Bright
274.4Bright
284.3Bright
294.3Bright
304.3Bright
Planning a trip in September

Hazard calendar for Grand Island

In seasonPeak

In September, Grand Island sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Grand Island's rainy season runs April–October, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Grand Island?

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

7.5
Sightseeing
1st-best month of the year
6.7
Beach & pool
4th-best month of the year

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

What to pack for Grand Island in September

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

In September, Grand Island sees daytime highs around 77°F and nights near 55°F. Worth packing: light clothes and sun protection. About 7 days see rain.

light clothessun protection

UV index in Grand Island in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 July 13 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJul 13UV 9Dec 22UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May7High
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct5Moderate
Nov3Moderate
Dec2Low
Location & terrain

Where is Grand Island?

Grand Island sits at 40.9°N, 98.3°W, 1,860 ft above sea level, in United States. The nearest listed city is Hastings, 24 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 75 ft around an average of 1,857 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 190 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 948 ft.

The land around Grand Island is covered by artificial surfaces (43%), grassland (23%) and trees (20%) within 2 miles, cropland (65%) and grassland (23%) within 10 miles, and cropland (70%) and grassland (26%) within 50 miles.

2 miles
75 ft
10 miles
190 ft
50 miles
948 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Hastings 24 mi · Kearney 42 mi · Columbus 62 mi · Lincoln 88 mi · Norfolk 90 mi · Fremont 102 mi · Papillion 121 mi · La Vista 122 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 (40.925°, -98.342°, elevation 1,860 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).