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
As August transitions to September, the average high-temperature falls from a moderately hot 82.6°F (28.1°C) to an agreeable 73°F (22.8°C). An average minimum temperature of 54°F (12.2°C) marks the month of September.Humidity
The months with the lowest humidity are August and September, with an average relative humidity of 51%.Rainfall
In Thunder Hawk, in September, it is raining for 7.6 days, with typically 1.02" (26mm) of accumulated precipitation. Throughout the year, in Thunder Hawk, there are 101.3 rainfall days, and 14.25" (362mm) of precipitation is accumulated.Snowfall
In Thunder Hawk, South Dakota, snow does not fall in June through September.Daylight
The average length of the day in September in Thunder Hawk, South Dakota, is 12h and 31min.On the first day of September, sunrise is at 6:09 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:29 pm MDT.
Sunshine
In Thunder Hawk, the average sunshine in September is 9.7h.UV index
In September, the average daily maximum UV index in Thunder Hawk is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: During September, 4 as the daily maximum UV index converts into the following advice:
Exercise prevention - Protecting skin and eyes from harm is required. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Thunder Hawk?
What is the least humid month in Thunder Hawk?
What is the average humidity in September in Thunder Hawk?
How much does it rain in Thunder Hawk in September?
When it does not snow in Thunder Hawk?
Does it snow in Thunder Hawk in September?
How many hours of daylight does Thunder Hawk have in September?
When is the sunrise / sunset in September in Thunder Hawk?
How many hours of sunshine does Thunder Hawk have in September?
How high is the UV index in September in Thunder Hawk?
Average temperature in September
Thunder Hawk, SD
- Average high temperature in September: 73°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (25.2°F).
- Average low temperature in September: 54°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (11.7°F).
Average pressure in September
Thunder Hawk, SD
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Thunder Hawk, SD
- Average wind speed in September: 10.7mph
The windiest month (with the highest average wind speed) is April (11.7mph).
The calmest month (with the lowest average wind speed) is August (9.6mph).
Average humidity in September
Thunder Hawk, SD
- Average humidity in September: 51%
The month with the highest relative humidity is January (85%).
The months with the lowest relative humidity are August and September (51%).
Average rainfall in September
Thunder Hawk, SD
- Average rainfall in September: 1.02"
The wettest month (with the highest rainfall) is June (2.28").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days in September
Thunder Hawk, SD
- Average rainfall days in September: 7.6 days
The month with the highest number of rainy days is June (15.1 days).
The month with the least rainy days is January (2.9 days).
Average snowfall in September
Thunder Hawk, SD
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.53").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Thunder Hawk, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (12.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Thunder Hawk, SD
- 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: 9h and 4min
The month with the most sunshine is August (Average sunshine: 11h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in September
Thunder Hawk, SD
- Average sunshine days in September: 19.2 days
The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is June (11.7 days).
Average UV index in September
Thunder Hawk, SD
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Thunder Hawk, SD
- Average cloud cover in September: 23
The months with the most cloud cover are January and February (Cloud cover 52).
The months with the least cloud cover are July and August (Cloud cover 20).
Average visibility in September
Thunder Hawk, SD
- 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).
Thunder Hawk, South Dakota, USA
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