September weather forecastSaint Robert, MO
September
Weather in September
September, the first month of the autumn in Saint Robert, is also a moderately hot month, with an average temperature ranging between max 80.4°F (26.9°C) and min 59.4°F (15.2°C).Temperature
September implies a soft temperature shift, with average high-temperatures reducing from August's hot 87.3°F (30.7°C) to a warm 80.4°F (26.9°C). Saint Robert registers a consistent average low-temperature of 59.4°F (15.2°C) during September.Humidity
August through October, with an average relative humidity of 73%, are the least humid months in Saint Robert.Rainfall
In Saint Robert, in September, it is raining for 12.1 days, with typically 2.01" (51mm) of accumulated precipitation. In Saint Robert, during the entire year, the rain falls for 147.7 days and collects up to 31.46" (799mm) of precipitation.Snowfall
In Saint Robert, snow does not fall in June through September.Daylight
In Saint Robert, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:39 am and sunset at 7:37 pm. On the last day of September, in Saint Robert, sunrise is at 7:04 am and sunset at 6:52 pm CDT.
Sunshine
In September, the average sunshine is 9.5h.UV index
In Saint Robert, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: In September, the maximum UV index of 5 translates into these guidelines:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Saint Robert, MO
- Average high temperature in September: 80.4°F
The warmest month (with the highest average high temperature) is July (89.2°F).
The month with the lowest average high temperature is January (40.3°F).
- Average low temperature in September: 59.4°F
The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (25°F).
Average pressure in September
Saint Robert, MO
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Saint Robert, MO
- Average wind speed in September: 5.9mph
The windiest month (with the highest average wind speed) is January (8.7mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in September
Saint Robert, MO
- Average humidity in September: 73%
The months with the highest relative humidity are March and May (77%).
The months with the lowest relative humidity are August, September and October (73%).
Average rainfall in September
Saint Robert, MO
- Average rainfall in September: 2.01"
The wettest month (with the highest rainfall) is May (4.29").
The driest month (with the least rainfall) is January (1.61").
Average rainfall days in September
Saint Robert, MO
- Average rainfall days in September: 12.1 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is December (7.5 days).
Average snowfall in September
Saint Robert, MO
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.54").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Saint Robert, MO
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (7.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Saint Robert, MO
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 9h and 30min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The months with the least sunshine are January and February (Average sunshine: 4h and 54min).
Average sunshine days in September
Saint Robert, MO
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is October (19.2 days).
The month with the least sunshine days is May (11.7 days).
Average UV index in September
Saint Robert, MO
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in September
Saint Robert, MO
- Average cloud cover in September: 30
The months with the most cloud cover are February and March (Cloud cover 48).
The month with the least cloud cover is June (Cloud cover 28).
Average visibility in September
Saint Robert, MO
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
