August weather forecastOttumwa, IA
August
Weather in August
August maintains the warm spell in Ottumwa with the warmest days reaching around 81.7°F (27.6°C). Compared to July, August tends to bring about slightly reduced temperatures and relative humidity. This does not take away from the joy of summer as the city continues to bask in around 13.8 daylight hours. The rainfall and wind speed take a middling stance between the summer drought and the impending autumn showers. The last of the summer break, August, spends its days with residents soaking up the sun before the transition into autumn.Temperature
August's advent denotes a minor fluctuation in the average high-temperature to a still moderately hot 81.7°F (27.6°C) from July's 82.6°F (28.1°C). August brings an average low-temperature of 63.1°F (17.3°C) to Ottumwa.Heat index
Throughout August, the heat index is computed to be a hot 87.8°F (31°C). Persisting in activity during long-term exposure might induce weariness, with subsequent heat cramps.Note that heat index values are valued for light wind and location in the shade. The heat index has the possibility to be enhanced by 15 Fahrenheit (8 Celsius) degrees when there is direct sun exposure.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is a value derived by merging air temperature with the humidity to convey how the climate feels. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
Humidity
In Ottumwa, Iowa, the average relative humidity in August is 78%.Rainfall
In Ottumwa, during August, the rain falls for 11.8 days and regularly aggregates up to 2.2" (56mm) of precipitation. In Ottumwa, during the entire year, the rain falls for 134.5 days and collects up to 27.17" (690mm) of precipitation.Snowfall
In Ottumwa, snow does not fall in June through September.Daylight
The average length of the day in August is 13h and 46min.On the first day of the month, sunrise is at 6:06 am and sunset at 8:25 pm. On the last day of August, in Ottumwa, sunrise is at 6:36 am and sunset at 7:43 pm CDT.
Sunshine
In August, the average sunshine in Ottumwa, Iowa, is 9.9h.UV index
June through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for the ordinary person.Note: A maximum high daily UV index of 6 during August translates into the following directions:
Undertake precautions and comply with sun safety standards. Protection from skin and eye injury is vital. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Ottumwa, IA
- Average high temperature in August: 81.7°F
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (29.3°F).
- Average low temperature in August: 63.1°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).
Average pressure in August
Ottumwa, IA
- Average pressure in August: 29.97"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in August
Ottumwa, IA
- Average wind speed in August: 6.9mph
The windiest month (with the highest average wind speed) is January (10.8mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).
Average humidity in August
Ottumwa, IA
- Average humidity in August: 78%
The month with the highest relative humidity is June (83%).
The month with the lowest relative humidity is October (72%).
Average rainfall in August
Ottumwa, IA
- Average rainfall in August: 2.2"
The wettest month (with the highest rainfall) is May (4.02").
The driest month (with the least rainfall) is January (1.06").
Average rainfall days in August
Ottumwa, IA
- Average rainfall days in August: 11.8 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (5.2 days).
Average snowfall in August
Ottumwa, IA
- Average snowfall in August: 0"
The month with the highest snowfall is February (4.17").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in August
Ottumwa, IA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (10.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in August /
Average sunshine in August
Ottumwa, IA
- Average daylight in August: 13h and 48min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in August: 9h and 54min
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
Ottumwa, IA
- Average sunshine days in August: 16.7 days
The month with the most sunshine days is December (18.9 days).
The month with the least sunshine days is May (11.6 days).
Average UV index in August
Ottumwa, IA
- 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, November and December (UV index 2).
Average cloud cover in August
Ottumwa, IA
- Average cloud cover in August: 29
The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are August and September (Cloud cover 29).
Average visibility in August
Ottumwa, IA
- 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).
