Grand Island weather in September: Grand Island, Nebraska: normal highs, lows, rain and records for September
Grand Island in September has a normal high of 79°F and a normal low of 54°F, a daily mean of 67°F, falling from 84°F on the 1st to 74°F by the 30th. Measurable precipitation falls on 7 days in a normal September, 2.00 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 26°C and low of 12°C, 51 mm of precipitation and 0 cm of snow in September.
- NOAA stationGrand Island Central NE Regional Airport
- Station IDUSW00014935
- Location40.96°N 98.31°W
- Elevation1,840 ft (561 m)
- Population53,250
- Jan 36° 16°
- Feb 40° 19°
- Mar 53° 29°
- Apr 63° 39°
- May 73° 51°
- Jun 84° 61°
- Jul 88° 66°
- Aug 86° 64°
- Sep 79° 54°
- Oct 66° 41°
- Nov 51° 28°
- Dec 39° 19°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Grand Island in September?
The normal high is 79°F and the normal low 54°F, for a daily mean of 66.6°F. September is 8.0°F cooler than August and 13.5°F warmer than October. September is the 4th warmest month of the year in Grand Island and the 6th wettest. Across the month the normal high falls 10°F, from 84°F on September 1 to 74°F on September 30. From one year to the next September's mean temperature typically moves about 3.1°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 63°F and 70°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 24%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 84°F | 59°F | 24% | 15% |
| September 8 | 82°F | 57°F | 24% | 15% |
| September 15 | 80°F | 54°F | 23% | 14% |
| September 22 | 77°F | 51°F | 23% | 14% |
| September 30 | 74°F | 48°F | 22% | 13% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 84°F | 59°F | 24% | 15% | 13 h 10 min |
| September 2 | 84°F | 59°F | 24% | 15% | 13 h 10 min |
| September 3 | 83°F | 59°F | 24% | 15% | 13 h |
| September 4 | 83°F | 58°F | 24% | 15% | 13 h |
| September 5 | 83°F | 58°F | 24% | 15% | 13 h |
| September 6 | 83°F | 58°F | 24% | 15% | 13 h |
| September 7 | 82°F | 57°F | 24% | 15% | 12 h 50 min |
| September 8 | 82°F | 57°F | 24% | 15% | 12 h 50 min |
| September 9 | 82°F | 57°F | 24% | 14% | 12 h 50 min |
| September 10 | 82°F | 56°F | 24% | 14% | 12 h 50 min |
| September 11 | 81°F | 56°F | 23% | 14% | 12 h 40 min |
| September 12 | 81°F | 56°F | 23% | 14% | 12 h 40 min |
| September 13 | 81°F | 55°F | 23% | 14% | 12 h 40 min |
| September 14 | 80°F | 55°F | 23% | 14% | 12 h 30 min |
| September 15 | 80°F | 54°F | 23% | 14% | 12 h 30 min |
| September 16 | 80°F | 54°F | 23% | 14% | 12 h 30 min |
| September 17 | 79°F | 53°F | 23% | 14% | 12 h 30 min |
| September 18 | 79°F | 53°F | 23% | 14% | 12 h 20 min |
| September 19 | 78°F | 53°F | 23% | 14% | 12 h 20 min |
| September 20 | 78°F | 52°F | 23% | 14% | 12 h 20 min |
| September 21 | 78°F | 52°F | 23% | 14% | 12 h 20 min |
| September 22 | 77°F | 51°F | 23% | 14% | 12 h 10 min |
| September 23 | 77°F | 51°F | 23% | 14% | 12 h 10 min |
| September 24 | 76°F | 51°F | 23% | 14% | 12 h 10 min |
| September 25 | 76°F | 50°F | 23% | 13% | 12 h 10 min |
| September 26 | 75°F | 50°F | 23% | 13% | 12 h |
| September 27 | 75°F | 49°F | 22% | 13% | 12 h |
| September 28 | 75°F | 49°F | 22% | 13% | 12 h |
| September 29 | 74°F | 48°F | 22% | 13% | 11 h 50 min |
| September 30 | 74°F | 48°F | 22% | 13% | 11 h 50 min |
- Normal high
- 79°FSeptember average
- Normal low
- 54°FSeptember average
- Precipitation
- 2.00 inmonth total
- Days with precipitation
- 70.01 inch or more
- Snowfall
- 0.1 inmonth total
- Days at 90°F or more
- 4
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 25
- Days at 80°F or more
- 15
- Sunshine
- 82%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014935; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Grand Island in September?
On a given September day the chance of 0.01 inch or more is 23% on average, highest around September 1 (24%). In all, 2.00 in falls on 7 days of a normal September.
In a normal September in Grand Island, 4 days reach 90°F and snowfall averages 0.1 inches.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014935.
How humid and windy is Grand Island in September?
At 3 p.m. the normal temperature is 71°F with 38% relative humidity and a dew point of 45°F; at 6 a.m. it is 50°F with 82% humidity. The wind averages 10.6 mph, most often from the southwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 50°F | 45°F | 82% | 8.7 mph | 69% |
| 9 a.m. | 58°F | 47°F | 66% | 12.1 mph | 74% |
| noon | 68°F | 46°F | 45% | 13.7 mph | 68% |
| 3 p.m. | 71°F | 45°F | 38% | 13.8 mph | 75% |
| 6 p.m. | 66°F | 46°F | 48% | 9.7 mph | 75% |
| 9 p.m. | 57°F | 46°F | 66% | 9.2 mph | 82% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014935. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Grand Island?
The warmest September temperature on Grand Island's official record (since 1895) is 109°F, on September 6, 1931; the coldest is 20°F, on September 30, 1920. The wettest September brought 9.00 in (1965); the snowiest, 3.8 inches (1985).
The September mean against the 1991-2020 normal of 66.6°F: 2021 69.5°F (+2.9), 2022 70.2°F (+3.6), 2023 70.9°F (+4.3), 2024 70.6°F (+4.0), 2025 68.1°F (+1.5), 2026 71.5°F (+4.9). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 69.5°F | +2.9°F | 1.48 in |
| 2022 | 70.2°F | +3.6°F | 1.29 in |
| 2023 | 70.9°F | +4.3°F | 1.55 in |
| 2024 | 70.6°F | +4.0°F | 0.36 in |
| 2025 | 68.1°F | +1.5°F | 1.80 in |
| 2026 | 71.5°F | +4.9°F | 5.72 in |
Source: records: ACIS, NWS threaded record GRIthr; recent months: ACIS, station USW00014935. Records and recent months use complete months only.
How does September in Grand Island compare across Nebraska?
Across the 137 places PlainClimate covers in Nebraska, September normal highs run from 74°F in Harrison to 83°F in Beaver City; Grand Island's is 79°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Grand Island in August86°F by day, 64°F at night
- Grand Island in October66°F by day, 41°F at night
- Grand Island through the yearEvery month, frost dates, records and recent years
- Nebraska in SeptemberThe statewide normal and the warmest and coolest places
- Beaver City: Nebraska's warmest Septembernormal high 83°F