September weather forecastMackay, ID
September
Weather in September
September, the first month of the autumn in Mackay, is still a pleasant month, with an average temperature fluctuating between 69.3°F (20.7°C) and 49.6°F (9.8°C).Temperature
With September's onset, the average high-temperature recedes from August's warm 79.3°F (26.3°C) to an agreeable 69.3°F (20.7°C). During September, the average low-temperature is a frosty 49.6°F (9.8°C).Humidity
In September, the average relative humidity is 38%.Rainfall
In Mackay, during September, the rain falls for 8 days and regularly aggregates up to 0.71" (18mm) of precipitation. In Mackay, during the entire year, the rain falls for 107.2 days and collects up to 10.31" (262mm) of precipitation.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows in Mackay. Throughout September, in the average 0.2 snowfall days, it receives 0.16" (4mm) of snow. In Mackay, during the entire year, snow falls for 75.2 days and aggregates up to 35.28" (896mm) of snow.Daylight
In Mackay, the average length of the day in September is 12h and 29min.On the first day of September in Mackay, Idaho, sunrise is at 6:58 am and sunset at 8:09 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 7:16 pm MDT.
Sunshine
In Mackay, the average sunshine in September is 9.6h.UV index
In Mackay, Idaho, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The daily high UV index of 4 in September translates into this advice:
Guard yourself - Avoiding sunburn is suggested. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Mackay, ID
- Average high temperature in September: 69.3°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is December (25.3°F).
- Average low temperature in September: 49.6°F
The month with the highest average low temperature is July (56.8°F).
The coldest month (with the lowest average low temperature) is January (10°F).
Average pressure in September
Mackay, ID
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.29"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Mackay, ID
- Average wind speed in September: 6.8mph
The windiest month (with the highest average wind speed) is June (8mph).
The calmest month (with the lowest average wind speed) is January (4.7mph).
Average humidity in September
Mackay, ID
- Average humidity in September: 38%
The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are July and August (32%).
Average rainfall in September
Mackay, ID
- Average rainfall in September: 0.71"
The wettest month (with the highest rainfall) is May (1.42").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in September
Mackay, ID
- Average rainfall days in September: 8 days
The month with the highest number of rainy days is May (15 days).
The month with the least rainy days is July (5.9 days).
Average snowfall in September
Mackay, ID
- Average snowfall in September: 0.16"
The month with the highest snowfall is February (7.2").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Mackay, ID
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is February (15.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Mackay, ID
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 9h and 36min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 30min).
Average sunshine days in September
Mackay, ID
- Average sunshine days in September: 19.4 days
The month with the most sunshine days is July (20.9 days).
The month with the least sunshine days is May (11.3 days).
Average UV index in September
Mackay, ID
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in September
Mackay, ID
- Average cloud cover in September: 15
The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 10).
Average visibility in September
Mackay, ID
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and February (4mi).
