August weather forecastPortland, MI
August
Weather in August
The last month of the summer, August, is also a moderately hot month in Portland, Michigan, with temperature in the range of an average high of 77.9°F (25.5°C) and an average low of 59.5°F (15.3°C).Temperature
Portland experiences a transition to a still warm 77.9°F (25.5°C) in average high-temperatures with the arrival of August, not greatly differing from July's 79.2°F (26.2°C). Portland experiences an average low-temperature reading of 59.5°F (15.3°C) throughout August.Humidity
In Portland, the average relative humidity in August is 80%.Rainfall
In Portland, Michigan, during August, the rain falls for 11.8 days and regularly aggregates up to 1.14" (29mm) of precipitation. Throughout the year, in Portland, there are 121.9 rainfall days, and 12.01" (305mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Portland, Michigan.Daylight
The average length of the day in August is 13h and 53min.On the first day of the month, sunrise is at 6:31 am and sunset at 9:00 pm. On the last day of August, sunrise is at 7:04 am and sunset at 8:15 pm EDT.
Sunshine
The average sunshine in August is 9.7h.UV index
May through August, with an average maximum UV index of 5, are months with the highest UV index in Portland. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: A typical high UV index of 5 in August suggests the following recommendations:
Undertake protective steps - Recommendations to avoid sunburn are issued. It's recommended to limit sun exposure when its radiation is at its peak during midday. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Portland, MI
- Average high temperature in August: 77.9°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (27.1°F).
- Average low temperature in August: 59.5°F
The month with the highest average low temperature is July (60.8°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).
Average pressure in August
Portland, MI
- Average pressure in August: 29.97"Hg
The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in August
Portland, MI
- Average wind speed in August: 6.7mph
The windiest month (with the highest average wind speed) is February (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).
Average humidity in August
Portland, MI
- Average humidity in August: 80%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is April (76%).
Average rainfall in August
Portland, MI
- Average rainfall in August: 1.14"
The wettest month (with the highest rainfall) is May (1.77").
The driest months (with the least rainfall) are February and November (0.63").
Average rainfall days in August
Portland, MI
- Average rainfall days in August: 11.8 days
The month with the highest number of rainy days is May (14.5 days).
The month with the least rainy days is February (4.6 days).
Average snowfall in August
Portland, MI
- Average snowfall in August: 0"
The month with the highest snowfall is December (2.05").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in August
Portland, MI
- Average snowfall days in August: 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 August /
Average sunshine in August
Portland, MI
- Average daylight in August: 13h and 54min
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: 9h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 2h and 42min).
Average sunshine days in August
Portland, MI
- Average sunshine days in August: 15.9 days
The month with the most sunshine days is September (17.8 days).
The month with the least sunshine days is February (13.2 days).
Average UV index in August
Portland, MI
- Average UV index in August: 5
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in August
Portland, MI
- Average cloud cover in August: 33
The month with the most cloud cover is January (Cloud cover 72).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in August
Portland, MI
- Average visibility in August: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
