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
In Foster City, the beginning of September is marked by a marginally lowered average high-temperature, shifting from August's warm 75.7°F (24.3°C) to a refreshing 67.6°F (19.8°C). An average temperature of 48.6°F (9.2°C) is recorded in Foster City, Michigan, during the nights in September.Humidity
The average relative humidity in September in Foster City is 81%.Rainfall
In Foster City, Michigan, during September, the rain falls for 11.5 days and regularly aggregates up to 1.81" (46mm) of precipitation. In Foster City, during the entire year, the rain falls for 137.4 days and collects up to 22.83" (580mm) of precipitation.Snowfall
June through September are months without snowfall in Foster City.Daylight
The average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 6:12 am and sunset at 7:28 pm. On the last day of September, sunrise is at 6:49 am and sunset at 6:32 pm CDT.
Sunshine
The average sunshine in September in Foster City is 8.1h.UV index
The average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: The average daily UV index of 3 in September transforms into the following instructions:
Be vigilant - Preventing sunburn is recommended. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Frequently asked questions
What is the temperature in September in Foster City?
What is the average humidity in September in Foster City?
How many days does it rain in September in Foster City?
When it does not snow in Foster City?
Does it snow in Foster City in September?
What is the average length of the day in September in Foster City?
When are sunrise and sunset in September in Foster City?
How long on average sun shines in September in Foster City?
What is the UV index intensity in September in Foster City?
Average temperature in September
Foster City, MI
- Average high temperature in September: 67.6°F
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (21°F).
- Average low temperature in September: 48.6°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 (10.2°F).
Average pressure in September
Foster City, MI
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Foster City, MI
- Average wind speed in September: 7mph
The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in September
Foster City, MI
- Average humidity in September: 81%
The month with the highest relative humidity is February (90%).
The month with the lowest relative humidity is May (72%).
Average rainfall in September
Foster City, MI
- Average rainfall in September: 1.81"
The wettest month (with the highest rainfall) is June (2.6").
The driest month (with the least rainfall) is January (1.14").
Average rainfall days in September
Foster City, MI
- Average rainfall days in September: 11.5 days
The months with the highest number of rainy days are May, June and July (15.3 days).
The month with the least rainy days is February (5.7 days).
Average snowfall in September
Foster City, MI
- Average snowfall in September: 0"
The month with the highest snowfall is February (9.09").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Foster City, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (20.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Foster City, MI
- 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 1min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is February (Average sunshine: 2h and 48min).
Average sunshine days in September
Foster City, MI
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is September (15.5 days).
The month with the least sunshine days is February (9.1 days).
Average UV index in September
Foster City, MI
- Average UV index in September: 3
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover in September
Foster City, MI
- Average cloud cover in September: 42
The month with the most cloud cover is February (Cloud cover 70).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in September
Foster City, MI
- Average visibility in September: 5mi
The months with the highest visibility are May, June, October and November (6mi).
The month with the lowest visibility is February (4mi).
Foster City, Michigan, USA
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