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
Transition into September subtly marks a drop in the average high-temperature, moderately moving from a moderately hot 80.4°F (26.9°C) in August to an agreeable 72°F (22.2°C). Hammer's nights in September cool down to an average low-temperature of 52°F (11.1°C).Humidity
September is the least humid month in Hammer, with an average relative humidity of 65%.Rainfall
In September, the rain falls for 9.9 days. Throughout September, 1.73" (44mm) of precipitation is accumulated. In Hammer, during the entire year, the rain falls for 107.9 days and collects up to 20.63" (524mm) of precipitation.Snowfall
June through September are months without snowfall in Hammer, South Dakota.Daylight
In September, the average length of the day is 12h and 31min.On the first day of September in Hammer, sunrise is at 6:50 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 7:09 pm CDT.
Sunshine
In Hammer, the average sunshine in September is 8.8h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the average person.Note: A maximum high UV index of 4 in September translates into the following recommendations:
Preventative actions are necessary - Recommendations to ward off sunburn are given. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Frequently asked questions
What are September temperatures in Hammer?
What is the least humid month in Hammer?
What is the average humidity in September in Hammer?
How many days does it rain in September in Hammer?
When it does not snow in Hammer?
Does it snow in Hammer in September?
What is the average length of the day in September in Hammer?
When is the sunrise / sunset in September in Hammer?
How many hours of sunshine does Hammer have in September?
What is the UV index intensity in September in Hammer?
Average temperature in September
Hammer, SD
- Average high temperature in September: 72°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (19°F).
- Average low temperature in September: 52°F
The month with the highest average low temperature is July (61.7°F).
The coldest month (with the lowest average low temperature) is January (5.4°F).
Average pressure in September
Hammer, SD
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is February (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in September
Hammer, SD
- Average wind speed in September: 9.6mph
The windiest months (with the highest average wind speed) are April and October (10.9mph).
The calmest months (with the lowest average wind speed) are July and August (8.3mph).
Average humidity in September
Hammer, SD
- Average humidity in September: 65%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is September (65%).
Average rainfall in September
Hammer, SD
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is July (3.27").
The driest month (with the least rainfall) is January (0.55").
Average rainfall days in September
Hammer, SD
- Average rainfall days in September: 9.9 days
The month with the highest number of rainy days is June (17.6 days).
The month with the least rainy days is February (1.6 days).
Average snowfall in September
Hammer, SD
- Average snowfall in September: 0"
The month with the highest snowfall is December (4.29").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Hammer, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (11.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Hammer, 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: 8h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Hammer, SD
- Average sunshine days in September: 17.7 days
The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is June (10.8 days).
Average UV index in September
Hammer, SD
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Hammer, SD
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are July and August (Cloud cover 25).
Average visibility in September
Hammer, SD
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Hammer, South Dakota, USA
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