Contents
- Weather in August
- Frequently asked questions
- Average temperature in August
- Average pressure in August
- Average wind speed in August
- Average humidity in August
- Average rainfall in August
- Average rainfall days in August
- Average snowfall in August
- Average snowfall days in August
- Average daylight in August
- Average sunshine in August
- Average sunshine days in August
- Average UV index in August
- Average cloud cover in August
- Average visibility in August
Weather in August
Temperature
As Chelmsford transitions into August, the average high-temperature stands at a still warm 80.6°F (27°C), offering little variation from the preceding month. Throughout the month of August, the nighttime temperature dips to an average of 62.2°F (16.8°C).Heat index
Throughout August, the heat index is evaluated at 84.2°F (29°C). If one stays active during extended exposure, it might induce fatigue and result in heat cramps.Realize that the values for the heat index are set for shaded places and light winds. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
Humidity
The average relative humidity in August is 74%.Rainfall
In August, the rain falls for 13.1 days. Throughout August, 1.93" (49mm) of precipitation is accumulated. In Chelmsford, Massachusetts, during the entire year, the rain falls for 145.9 days and collects up to 27.48" (698mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In August, the average length of the day is 13h and 52min.On the first day of the month, sunrise is at 5:38 am and sunset at 8:05 pm. On the last day of August, sunrise is at 6:10 am and sunset at 7:21 pm EDT.
Sunshine
August has the most sunshine of the year, with an average of 10.6h of sunshine.UV index
June through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: The daily high UV index of 6 in August translates into this advice:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in August?
What is the average humidity in August in Chelmsford?
How many days does it rain in August?
When it does not snow?
How many hours of daylight does Chelmsford have in August?
What time are sunrise and sunset in August?
What month has the most sunshine?
How many hours of sunshine does Chelmsford have in August?
What is the month with the highest UV index?
How high is the UV index in August?
Average temperature in August
Chelmsford, MA
- Average high temperature in August: 80.6°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (32.5°F).
- Average low temperature in August: 62.2°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 (19.9°F).
Average pressure in August
Chelmsford, MA
- Average pressure in August: 29.97"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 August
Chelmsford, MA
- Average wind speed in August: 5.5mph
The windiest month (with the highest average wind speed) is January (8.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in August
Chelmsford, MA
- Average humidity in August: 74%
The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is April (70%).
Average rainfall in August
Chelmsford, MA
- Average rainfall in August: 1.93"
The wettest month (with the highest rainfall) is December (2.87").
The driest month (with the least rainfall) is September (1.46").
Average rainfall days in August
Chelmsford, MA
- Average rainfall days in August: 13.1 days
The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is February (6.9 days).
Average snowfall in August
Chelmsford, MA
- Average snowfall in August: 0"
The month with the highest snowfall is February (5.98").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in August
Chelmsford, MA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is February (8.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in August /
Average sunshine in August
Chelmsford, MA
- Average daylight in August: 13h and 5min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in August: 10h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in August
Chelmsford, MA
- Average sunshine days in August: 15.9 days
The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is May (13.6 days).
Average UV index in August
Chelmsford, MA
- Average UV index in August: 6
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 August
Chelmsford, MA
- Average cloud cover in August: 31
The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in August
Chelmsford, MA
- Average visibility in August: 6mi
The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is February (5mi).
Chelmsford, Massachusetts, USA
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