September weather forecastGrand Island, NE
September
Weather in September
September announces the arrival of fall in Grand Island, Nebraska. The city witnesses a dramatic change in its foliage, painting a kaleidoscopic canvas of reds, oranges, and yellows. Marking the end of summer, September's weather echoes a melodious equilibrium, blending the warmth of summer with the cool onset of autumn. Rainfall remains low at 1.34" (34mm), offering many fair-weather days to relish the autumnal ambience. October looms, bringing with it a deepening fall chill.Temperature
The onset of September aligns with a soft reduction in the average high-temperature, gently falling from 85.1°F (29.5°C) in August to a still moderately hot 78.3°F (25.7°C). The significant decline in Grand Island's temperature, from day to night, averages of 56.7°F (13.7°C) in September.Humidity
In September, the average relative humidity is 66%.Rainfall
In Grand Island, in September, during 10.7 rainfall days, 1.34" (34mm) of precipitation is typically accumulated. In Grand Island, during the entire year, the rain falls for 109.5 days and collects up to 19.37" (492mm) of precipitation.Snowfall
In Grand Island, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 27min.On the first day of the month, sunrise is at 7:00 am and sunset at 8:05 pm. On the last day of September, in Grand Island, sunrise is at 7:29 am and sunset at 7:16 pm CDT.
Sunshine
In September, the average sunshine is 8.6h.UV index
In Grand Island, Nebraska, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 5 during September translates into the following directions:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Grand Island, NE
- Average high temperature in September: 78.3°F
The warmest month (with the highest average high temperature) is July (86.7°F).
The month with the lowest average high temperature is January (33.4°F).
- Average low temperature in September: 56.7°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (19°F).
Average pressure in September
Grand Island, NE
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Grand Island, NE
- Average wind speed in September: 9.5mph
The windiest month (with the highest average wind speed) is April (11.6mph).
The calmest month (with the lowest average wind speed) is July (8mph).
Average humidity in September
Grand Island, NE
- Average humidity in September: 66%
The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is October (61%).
Average rainfall in September
Grand Island, NE
- Average rainfall in September: 1.34"
The wettest month (with the highest rainfall) is May (3.27").
The driest month (with the least rainfall) is January (0.51").
Average rainfall days in September
Grand Island, NE
- Average rainfall days in September: 10.7 days
The month with the highest number of rainy days is May (15 days).
The month with the least rainy days is February (1.7 days).
Average snowfall in September
Grand Island, NE
- Average snowfall in September: 0"
The month with the highest snowfall is December (3.23").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Grand Island, NE
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (6.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Grand Island, NE
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).
Average sunshine days in September
Grand Island, NE
- Average sunshine days in September: 17.2 days
The month with the most sunshine days is November (22.9 days).
The month with the least sunshine days is June (13.6 days).
Average UV index in September
Grand Island, NE
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Grand Island, NE
- Average cloud cover in September: 27
The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility in September
Grand Island, NE
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
