September weather forecastHolliston, MA
September
Weather in September
September, the first month of the autumn in Holliston, is still a pleasant month, with an average temperature ranging between min 55.6°F (13.1°C) and max 73.2°F (22.9°C).Temperature
With the onset of September, the average high-temperature subtly recedes from August's moderately hot 81°F (27.2°C) to a pleasant 73.2°F (22.9°C). Holliston's nighttime temperature in September drops to an average of 55.6°F (13.1°C).Humidity
In Holliston, the average relative humidity in September is 77%.Rainfall
The month with the least rainfall is September, when the rain falls for 12.6 days and typically collects 1.54" (39mm) of precipitation.Snowfall
In Holliston, snow does not fall in June through September.Daylight
In Holliston, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:11 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
In September, the average sunshine is 8.5h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, the maximum UV index of 4 suggests this advice:
Take necessary precautions - Suggestions to elude sunburn are provided. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Holliston, MA
- Average high temperature in September: 73.2°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (33.1°F).
- Average low temperature in September: 55.6°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (21°F).
Average pressure in September
Holliston, 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 (29.93"Hg).
Average wind speed in September
Holliston, MA
- Average wind speed in September: 6.1mph
The windiest month (with the highest average wind speed) is January (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).
Average humidity in September
Holliston, MA
- Average humidity in September: 77%
The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is April (70%).
Average rainfall in September
Holliston, MA
- Average rainfall in September: 1.54"
The wettest month (with the highest rainfall) is April (2.87").
The driest month (with the least rainfall) is September (1.54").
Average rainfall days in September
Holliston, MA
- Average rainfall days in September: 12.6 days
The month with the highest number of rainy days is July (18.4 days).
The month with the least rainy days is January (7.5 days).
Average snowfall in September
Holliston, MA
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.61").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Holliston, 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
Holliston, MA
- Average daylight in September: 12h and 30min
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 12min).
- Average sunshine in September: 8h and 30min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in September
Holliston, MA
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is June (11 days).
Average UV index in September
Holliston, 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
Holliston, MA
- Average cloud cover in September: 37
The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
Holliston, MA
- Average visibility in September: 5mi
The months with the highest visibility are January, March, April, May, June, July, October, November and December (6mi).
The months with the lowest visibility are February, August and September (5mi).
