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
The start of August marks an average high-temperature of a still moderately hot 81°F (27.2°C), hardly distinguishable from the conditions in July. An average low-temperature of 63°F (17.2°C) marks the month of August.Heat index
In August, the average heat index is calculated to be 84.2°F (29°C). Exhaustion might be the outcome of enduring exposure and continuous activity, with a risk of heat cramps.Heat index guidelines indicate values are for light wind scenarios and shaded regions. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is achieved by amalgamating air temperature with the relative humidity readings. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of activity. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Children typically face more danger than adults as their sweat production is usually lower. Additionally, the bigger skin surface compared to their small size and the increased heat due to their activeness exacerbate the risk.
Humidity
In Waltham, the average relative humidity in August is 73%.Rainfall
In Waltham, Massachusetts, in August, it is raining for 10 days, with typically 0.67" (17mm) of accumulated precipitation. Throughout the year, in Waltham, there are 106.3 rainfall days, and 8.5" (216mm) of precipitation is accumulated.Snowfall
June through October are months without snowfall.Daylight
In Waltham, Massachusetts, the average length of the day in August is 13h and 51min.On the first day of August, sunrise is at 5:38 am and sunset at 8:04 pm. On the last day of the month, sunrise is at 6:09 am and sunset at 7:20 pm EDT.
Sunshine
August has the most sunshine of the year, with an average of 10.5h of sunshine.UV index
The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for average individuals.Note: The daily maximum UV index of 6 in August interprets into the following advice:
Resist extreme sun exposure. Guarding against solar damage is essential. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
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?
How many days does it rain in August?
When it does not snow?
What is the average length of the day in August?
When are sunrise and sunset in August?
What month has the most sunshine?
How long on average sun shines in August?
When is the highest UV index?
What is the UV index reading in August?
Average temperature in August
Waltham, MA
- Average high temperature in August: 81°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.3°F).
- Average low temperature in August: 63°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in August
Waltham, 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
Waltham, MA
- Average wind speed in August: 5.8mph
The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity in August
Waltham, MA
- Average humidity in August: 73%
The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is April (70%).
Average rainfall in August
Waltham, MA
- Average rainfall in August: 0.67"
The wettest months (with the highest rainfall) are April and November (0.87").
The driest month (with the least rainfall) is September (0.35").
Average rainfall days in August
Waltham, MA
- Average rainfall days in August: 10 days
The month with the highest number of rainy days is July (12.4 days).
The month with the least rainy days is January (5.3 days).
Average snowfall in August
Waltham, MA
- Average snowfall in August: 0"
The month with the highest snowfall is December (1.14").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in August
Waltham, MA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is February (5.4 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in August /
Average sunshine in August
Waltham, MA
- Average daylight in August: 13h and 5min
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 August: 10h and 3min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in August
Waltham, MA
- Average sunshine days in August: 17.8 days
The month with the most sunshine days is January (22.2 days).
The month with the least sunshine days is June (15.8 days).
Average UV index in August
Waltham, 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
Waltham, MA
- Average cloud cover in August: 32
The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in August
Waltham, MA
- Average visibility in August: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Waltham, Massachusetts, USA
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