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
With the onset of September, Grand Rapids's average high-temperature slightly adjusts, moderately receding from August's moderately hot 77°F (25°C) to an agreeable 70.3°F (21.3°C). Grand Rapids's average low-temperature of 47.7°F (8.7°C) in September reflects a significant disparity from the daytime highs.Humidity
In September, the average relative humidity is 79%.Rainfall
In Grand Rapids, during September, the rain falls for 12.2 days and regularly aggregates up to 1.81" (46mm) of precipitation. In Grand Rapids, during the entire year, the rain falls for 184.4 days and collects up to 36.61" (930mm) of precipitation.Snowfall
May through October are months without snowfall in Grand Rapids.Daylight
In Grand Rapids, Oregon, the average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 6:36 am and sunset at 7:51 pm. On the last day of September, sunrise is at 7:12 am and sunset at 6:55 pm PDT.
Sunshine
In Grand Rapids, the average sunshine in September is 8.4h.UV index
In September, the average daily maximum UV index in Grand Rapids is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the average person.Note: In September, the UV index of 3 transforms into the following advice:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Frequently asked questions
What is the usual temperature for Grand Rapids in September?
What is the average humidity in September in Grand Rapids?
How much does it rain in Grand Rapids in September?
When it does not snow in Grand Rapids?
What is the average length of the day in September in Grand Rapids?
When are sunrise and sunset in September in Grand Rapids?
How many hours of sunshine does Grand Rapids have in September?
What is the UV index intensity in September in Grand Rapids?
Average temperature in September
Grand Rapids, OR
- Average high temperature in September: 70.3°F
The warmest month (with the highest average high temperature) is August (77°F).
The month with the lowest average high temperature is December (42.1°F).
- Average low temperature in September: 47.7°F
The month with the highest average low temperature is August (50.7°F).
The coldest month (with the lowest average low temperature) is December (32.9°F).
Average pressure in September
Grand Rapids, OR
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are August and September (30.02"Hg).
Average wind speed in September
Grand Rapids, OR
- Average wind speed in September: 3.9mph
The windiest months (with the highest average wind speed) are January, March and November (4.8mph).
The calmest month (with the lowest average wind speed) is September (3.9mph).
Average humidity in September
Grand Rapids, OR
- Average humidity in September: 79%
The month with the highest relative humidity is November (89%).
The month with the lowest relative humidity is July (73%).
Average rainfall in September
Grand Rapids, OR
- Average rainfall in September: 1.81"
The wettest month (with the highest rainfall) is January (5.79").
The driest months (with the least rainfall) are July and August (0.51").
Average rainfall days in September
Grand Rapids, OR
- Average rainfall days in September: 12.2 days
The month with the highest number of rainy days is March (21.7 days).
The month with the least rainy days is July (6 days).
Average snowfall in September
Grand Rapids, OR
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.94").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Grand Rapids, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (4.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Grand Rapids, OR
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 3h and 18min).
Average sunshine days in September
Grand Rapids, OR
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is July (22.1 days).
The months with the least sunshine days are February and March (7.6 days).
Average UV index in September
Grand Rapids, OR
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Grand Rapids, OR
- Average cloud cover in September: 43
The months with the most cloud cover are February and March (Cloud cover 67).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in September
Grand Rapids, OR
- Average visibility in September: 4mi
The months with the highest visibility are July and August (5mi).
The months with the lowest visibility are January, February, March, April, May, June, September, October, November and December (4mi).
Grand Rapids, Oregon, USA
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