August weather forecastJefferson, IA
August
Weather in August
The last month of the summer, August, is also a moderately hot month in Jefferson, Iowa, with temperature in the range of an average low of 61.5°F (16.4°C) and an average high of 80.1°F (26.7°C).Temperature
August's onset sees an average high-temperature of a still moderately hot 80.1°F (26.7°C), exhibiting a slight fluctuation from the previous month. An average low-temperature of 61.5°F (16.4°C) marks the month of August in Jefferson.Humidity
The average relative humidity in August is 80%.Rainfall
In Jefferson, in August, it is raining for 13 days, with typically 2.44" (62mm) of accumulated precipitation. Throughout the year, there are 125.7 rainfall days, and 26.5" (673mm) of precipitation is accumulated.Snowfall
In Jefferson, snow does not fall in June through September.Daylight
In Jefferson, the average length of the day in August is 13h and 49min.On the first day of August, sunrise is at 6:11 am and sunset at 8:35 pm. On the last day of the month, sunrise is at 6:42 am and sunset at 7:52 pm CDT.
Sunshine
The average sunshine in August in Jefferson is 9.6h.UV index
In August, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: The daily high UV index of 5 during August translates into the following recommendations:
Preventative actions are necessary - Recommendations to ward off sunburn are given. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Jefferson, IA
- Average high temperature in August: 80.1°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (26.8°F).
- Average low temperature in August: 61.5°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).
Average pressure in August
Jefferson, IA
- Average pressure in August: 29.96"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in August
Jefferson, IA
- Average wind speed in August: 7.1mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity in August
Jefferson, IA
- Average humidity in August: 80%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (69%).
Average rainfall in August
Jefferson, IA
- Average rainfall in August: 2.44"
The wettest month (with the highest rainfall) is May (4.06").
The driest month (with the least rainfall) is January (0.87").
Average rainfall days in August
Jefferson, IA
- Average rainfall days in August: 13 days
The month with the highest number of rainy days is June (17.3 days).
The month with the least rainy days is February (3.4 days).
Average snowfall in August
Jefferson, IA
- Average snowfall in August: 0"
The month with the highest snowfall is January (4.29").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in August
Jefferson, IA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (9.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in August /
Average sunshine in August
Jefferson, IA
- Average daylight in August: 13h and 48min
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 August: 9h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in August
Jefferson, IA
- Average sunshine days in August: 16.3 days
The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is June (11.1 days).
Average UV index in August
Jefferson, IA
- Average UV index in August: 5
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in August
Jefferson, IA
- Average cloud cover in August: 32
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are July and September (Cloud cover 30).
Average visibility in August
Jefferson, IA
- Average visibility in August: 5mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
