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 indicates a minor shift in the average high-temperature, from August's moderately hot 80.4°F (26.9°C) to a pleasant 72.9°F (22.7°C). During September, Marlborough observes a consistent average nighttime temperature of 54.7°F (12.6°C).Humidity
The average relative humidity in September in Marlborough is 77%.Rainfall
The month with the least rainfall is September, when the rain falls for 11.5 days and typically collects 1.34" (34mm) of precipitation.Snowfall
In Marlborough, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:12 am and sunset at 7:19 pm. On the last day of September, sunrise is at 6:42 am and sunset at 6:28 pm EDT.
Sunshine
The average sunshine in September in Marlborough is 8.4h.UV index
The average daily maximum UV index in September in Marlborough, Massachusetts, is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.Note: In September, the maximum UV index of 4 translates into these guidelines:
Guard yourself - An obligation to protect skin and eyes from harm exists. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Frequently asked questions
What is the average September temperature in Marlborough?
What is the average humidity in September in Marlborough?
What is the driest month in Marlborough?
How many days does it rain in September in Marlborough?
When it does not snow in Marlborough?
Does it snow in Marlborough in September?
What is the average length of the day in September in Marlborough?
What time are sunrise and sunset in September in Marlborough?
How long on average sun shines in September in Marlborough?
What is the UV index reading in September in Marlborough?
Average temperature in September
Marlborough, MA
- Average high temperature in September: 72.9°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (32.5°F).
- Average low temperature in September: 54.7°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in September
Marlborough, MA
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Marlborough, MA
- Average wind speed in September: 6mph
The windiest month (with the highest average wind speed) is January (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in September
Marlborough, MA
- Average humidity in September: 77%
The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is April (71%).
Average rainfall in September
Marlborough, MA
- Average rainfall in September: 1.34"
The wettest months (with the highest rainfall) are March, November and December (2.56").
The driest month (with the least rainfall) is September (1.34").
Average rainfall days in September
Marlborough, MA
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is January (6.8 days).
Average snowfall in September
Marlborough, MA
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.24").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Marlborough, MA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (7.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Marlborough, MA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in September
Marlborough, MA
- Average sunshine days in September: 16 days
The month with the most sunshine days is November (18.4 days).
The month with the least sunshine days is April (13.4 days).
Average UV index in September
Marlborough, MA
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Marlborough, MA
- Average cloud cover in September: 38
The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in September
Marlborough, MA
- Average visibility in September: 5mi
The months with the highest visibility are January, March, April, May, October, November and December (6mi).
The months with the lowest visibility are February, June, July, August and September (5mi).
Marlborough, Massachusetts, USA
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