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
September's onset corresponds with a subtle shift in the average high-temperature, slightly moving from a moderately hot 84°F (28.9°C) in August to a still warm 75.4°F (24.1°C). In September, Saint Lawrence encounters an average low-temperature of 54.5°F (12.5°C) during the night.Humidity
The least humid month is September, with an average relative humidity of 60%.Rainfall
In Saint Lawrence, in September, during 9 rainfall days, 1.1" (28mm) of precipitation is typically accumulated. Throughout the year, in Saint Lawrence, there are 97.3 rainfall days, and 16.73" (425mm) of precipitation is accumulated.Snowfall
In Saint Lawrence, snow does not fall in June through September.Daylight
In September, the average length of the day in Saint Lawrence is 12h and 30min.On the first day of September, sunrise is at 6:59 am and sunset at 8:11 pm. On the last day of the month, sunrise is at 7:33 am and sunset at 7:17 pm CDT.
Sunshine
In September, the average sunshine in Saint Lawrence is 8.6h.UV index
In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: A daily maximum UV index of 5 in September translates into the following instructions:
Put precautions into practice - Ensuring skin and eye safety is a necessity. Direct Sun exposure should be minimized especially during midday when radiation is most intense. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Saint Lawrence?
What is the least humid month in Saint Lawrence?
What is the average humidity in September in Saint Lawrence?
How much does it rain in Saint Lawrence in September?
When it does not snow in Saint Lawrence?
Does it snow in Saint Lawrence in September?
How many hours of daylight does Saint Lawrence have in September?
When are sunrise and sunset in September in Saint Lawrence?
How long on average sun shines in September in Saint Lawrence?
What is the UV index reading in September in Saint Lawrence?
Average temperature in September
Saint Lawrence, SD
- Average high temperature in September: 75.4°F
The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is January (23.4°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (9.1°F).
Average pressure in September
Saint Lawrence, SD
- Average pressure in September: 29.95"Hg
The months with the highest atmospheric pressure are January and February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Saint Lawrence, SD
- Average wind speed in September: 10.3mph
The windiest month (with the highest average wind speed) is April (11.3mph).
The calmest month (with the lowest average wind speed) is August (8.9mph).
Average humidity in September
Saint Lawrence, SD
- Average humidity in September: 60%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is September (60%).
Average rainfall in September
Saint Lawrence, SD
- Average rainfall in September: 1.1"
The wettest month (with the highest rainfall) is July (3.07").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in September
Saint Lawrence, SD
- Average rainfall days in September: 9 days
The month with the highest number of rainy days is June (15 days).
The month with the least rainy days is February (1.3 days).
Average snowfall in September
Saint Lawrence, SD
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.21").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Saint Lawrence, SD
- Average snowfall days in September: 0.1 days
The months with the highest number of snowfall days are January and February (10.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Saint Lawrence, SD
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in September
Saint Lawrence, SD
- Average sunshine days in September: 18.9 days
The month with the most sunshine days is November (22.1 days).
The month with the least sunshine days is June (12.4 days).
Average UV index in September
Saint Lawrence, SD
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in September
Saint Lawrence, SD
- Average cloud cover in September: 26
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 24).
Average visibility in September
Saint Lawrence, 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).
Saint Lawrence, South Dakota, USA
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