Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The start of September involves a subtle temperature drop, shifting from a warm 78.4°F (25.8°C) in August to an agreeable 72.3°F (22.4°C). In the month of September, Graf's average low-temperature falls to a cool 53.2°F (11.8°C).Humidity
In Graf, the average relative humidity in September is 80%.Rainfall
In Graf, in September, during 11.8 rainfall days, 2.28" (58mm) of precipitation is typically accumulated. In Graf, during the entire year, the rain falls for 139.8 days and collects up to 24.88" (632mm) of precipitation.Snowfall
In Graf, snow does not fall in May through September.Daylight
In Graf, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:29 am and sunset at 7:37 pm. On the last day of September, sunrise is at 7:00 am and sunset at 6:46 pm CDT.
Sunshine
In September, the average sunshine is 9.1h.UV index
In Graf, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, a regular UV index of 4 translates into these guidelines:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. When the Sun is at its strongest around midday, find shade and limit exposure. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Graf in September?
What is the average humidity in September in Graf?
How many days does it rain in September in Graf?
When it does not snow in Graf?
Does it snow in Graf in September?
How many hours of daylight does Graf have in September?
When is the sunrise / sunset in September in Graf?
How many hours of sunshine does Graf have in September?
What is the UV index intensity in September in Graf?
Average temperature in September
Graf, IA
- Average high temperature in September: 72.3°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (24.3°F).
- Average low temperature in September: 53.2°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (12°F).
Average pressure in September
Graf, IA
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Graf, IA
- Average wind speed in September: 7.7mph
The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in September
Graf, IA
- Average humidity in September: 80%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is October (76%).
Average rainfall in September
Graf, IA
- Average rainfall in September: 2.28"
The wettest month (with the highest rainfall) is June (3.5").
The driest months (with the least rainfall) are January and February (1.02").
Average rainfall days in September
Graf, IA
- Average rainfall days in September: 11.8 days
The months with the highest number of rainy days are May and June (18.3 days).
The month with the least rainy days is February (4.1 days).
Average snowfall in September
Graf, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.29").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Graf, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (13.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Graf, IA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 9h and 1min
The months with the most sunshine are July and August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in September
Graf, IA
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is May (9.3 days).
Average UV index in September
Graf, IA
- Average UV index in September: 4
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in September
Graf, IA
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Graf, IA
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February and July (5mi).
Graf, Iowa, USA
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