September weather forecastSunnyside, AK
September
Weather in September
September, the first month of the autumn in Sunnyside, is also a fresh month, with an average temperature fluctuating between 45°F (7.2°C) and 51.1°F (10.6°C).Temperature
September implies a soft temperature shift, with average high-temperatures reducing from August's refreshing 56.5°F (13.6°C) to a fresh 51.1°F (10.6°C). Throughout the nights in September, Sunnyside notes an average low of 45°F (7.2°C), a small dip from the daytime peak.Humidity
In September, the average relative humidity is 88%.Rainfall
In Sunnyside, during September, the rain falls for 18.3 days and regularly aggregates up to 3.62" (92mm) of precipitation. Throughout the year, there are 182.7 rainfall days, and 37.4" (950mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
In Sunnyside, the average length of the day in September is 12h and 46min.On the first day of September, sunrise is at 6:07 am and sunset at 8:02 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:40 pm AKDT.
Sunshine
In September, the average sunshine is 5.4h.UV index
In Sunnyside, the average daily maximum UV index in September is 2. A UV Index estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the average person.Note: The maximum UV index of 2 during September leads to these instructions:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sunnyside, AK
- Average high temperature in September: 51.1°F
The warmest month (with the highest average high temperature) is July (57.2°F).
The month with the lowest average high temperature is January (30.7°F).
- Average low temperature in September: 45°F
The month with the highest average low temperature is July (49.5°F).
The coldest month (with the lowest average low temperature) is February (25.9°F).
Average pressure in September
Sunnyside, AK
- Average pressure in September: 29.88"Hg
The month with the highest atmospheric pressure is July (30.03"Hg).
The month with the lowest atmospheric pressure is November (29.77"Hg).
Average wind speed in September
Sunnyside, AK
- Average wind speed in September: 5.1mph
The windiest month (with the highest average wind speed) is January (7mph).
The calmest months (with the lowest average wind speed) are June and July (3.7mph).
Average humidity in September
Sunnyside, AK
- Average humidity in September: 88%
The month with the highest relative humidity is August (90%).
The month with the lowest relative humidity is November (84%).
Average rainfall in September
Sunnyside, AK
- Average rainfall in September: 3.62"
The wettest months (with the highest rainfall) are October and November (4.21").
The driest month (with the least rainfall) is May (1.61").
Average rainfall days in September
Sunnyside, AK
- Average rainfall days in September: 18.3 days
The month with the highest number of rainy days is June (18.9 days).
The month with the least rainy days is February (8.2 days).
Average snowfall in September
Sunnyside, AK
- Average snowfall in September: 0"
The month with the highest snowfall is January (11.22").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Sunnyside, AK
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is March (13.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Sunnyside, AK
- Average daylight in September: 12h and 48min
The month with the longest days is June (Average daylight: 18h and 6min).
The month with the shortest days is December (Average daylight: 6h and 36min).
- Average sunshine in September: 5h and 24min
The month with the most sunshine is June (Average sunshine: 7h and 42min).
The months with the least sunshine are January and December (Average sunshine: 2h and 54min).
Average sunshine days in September
Sunnyside, AK
- Average sunshine days in September: 10.2 days
The months with the most sunshine days are February and May (12.5 days).
The month with the least sunshine days is June (7.7 days).
Average UV index in September
Sunnyside, AK
- Average UV index in September: 2
The month with the highest UV index is July (UV index 4).
The months with the lowest UV index are November and December (UV index 1).
Average cloud cover in September
Sunnyside, AK
- Average cloud cover in September: 63
The month with the most cloud cover is November (Cloud cover 71).
The month with the least cloud cover is May (Cloud cover 56).
Average visibility in September
Sunnyside, AK
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (5mi).
The months with the lowest visibility are July and August (4mi).
