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
The commencement of September includes a gentle temperature shift, with the average high-temperature dropping a bit from a moderately hot 74.3°F (23.5°C) in August to a comfortable 66.9°F (19.4°C). Calais experiences a mean temperature of 50.2°F (10.1°C) during September nights.Humidity
In Calais, the average relative humidity in September is 79%.Rainfall
In Calais, during September, the rain falls for 11.1 days and regularly aggregates up to 2.13" (54mm) of precipitation. In Calais, during the entire year, the rain falls for 155.3 days and collects up to 32.48" (825mm) of precipitation.Snowfall
In Calais, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 31min.On the first day of September, sunrise is at 6:51 am and sunset at 8:06 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 7:10 pm ADT.
Sunshine
In September, the average sunshine is 7.8h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 4 during September translates into the following directions:
Make use of precautions - Suggestions to resist sunburn are communicated. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Calais have in September?
When are sunrise and sunset in September?
How many hours of sunshine does Calais have in September?
How high is the UV index in September in Calais?
Average temperature in September
Calais, ME
- Average high temperature in September: 66.9°F
The warmest month (with the highest average high temperature) is July (74.8°F).
The month with the lowest average high temperature is January (26.6°F).
- Average low temperature in September: 50.2°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 (13.8°F).
Average pressure in September
Calais, ME
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is September (30.03"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Calais, ME
- Average wind speed in September: 6.9mph
The windiest month (with the highest average wind speed) is March (9.3mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity in September
Calais, ME
- Average humidity in September: 79%
The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is May (78%).
Average rainfall in September
Calais, ME
- Average rainfall in September: 2.13"
The wettest month (with the highest rainfall) is December (3.7").
The driest month (with the least rainfall) is August (1.77").
Average rainfall days in September
Calais, ME
- Average rainfall days in September: 11.1 days
The month with the highest number of rainy days is April (17.2 days).
The month with the least rainy days is February (7.8 days).
Average snowfall in September
Calais, ME
- Average snowfall in September: 0"
The month with the highest snowfall is January (7.44").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Calais, ME
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (15.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Calais, ME
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 7h and 5min
The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is February (Average sunshine: 3h and 24min).
Average sunshine days in September
Calais, ME
- Average sunshine days in September: 16.6 days
The month with the most sunshine days is September (16.6 days).
The month with the least sunshine days is April (8.5 days).
Average UV index in September
Calais, ME
- Average UV index in September: 4
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 2).
Average cloud cover in September
Calais, ME
- Average cloud cover in September: 39
The month with the most cloud cover is February (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 38).
Average visibility in September
Calais, ME
- Average visibility in September: 5mi
The months with the highest visibility are May, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, June, July, August and September (5mi).
Calais, Maine, USA
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