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 shift to August signals an average high-temperature of a still warm 81.1°F (27.3°C), subtly varied from July's 82°F (27.8°C). Throughout the month of August, Monmouth reports a steady low-temperature average of 63.3°F (17.4°C).Heat index
August's mean heat index is computed to be a tropical 86°F (30°C). Uninterrupted exposure and activity might result in fatigue, potentially causing heat cramps.When assessing, remember that heat index measurements are for light winds and shaded spots. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'feels like' or 'felt air temperature', ties air temperature with relative humidity to produce the perceived temperature sensation. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. Awareness is key; direct sunlight can enhance the weather's impact, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.
Humidity
In Monmouth, the average relative humidity in August is 80%.Rainfall
In Monmouth, in August, during 14 rainfall days, 2.13" (54mm) of precipitation is typically accumulated. In Monmouth, during the entire year, the rain falls for 149.4 days and collects up to 30.16" (766mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
The average length of the day in August is 13h and 46min.On the first day of August, sunrise is at 5:59 am and sunset at 8:18 pm. On the last day of the month, sunrise is at 6:29 am and sunset at 7:36 pm CDT.
Sunshine
The average sunshine in August is 9.8h.UV index
In Monmouth, the average daily maximum UV index in August is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The UV index of 5 during August leads to these advisories:
Be vigilant - Preventing sunburn is recommended. Around midday, solar radiation is most harmful; hence, exposure should be limited. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Monmouth in August?
What is the average humidity in August?
How much does it rain in August?
When it does not snow?
What is the average length of the day in August?
What time are sunrise and sunset in August?
How many hours of sunshine does Monmouth have in August?
What is the UV index reading in August?
Average temperature in August
Monmouth, IL
- Average high temperature in August: 81.1°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (29.7°F).
- Average low temperature in August: 63.3°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (17.6°F).
Average pressure in August
Monmouth, IL
- Average pressure in August: 29.97"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in August
Monmouth, IL
- Average wind speed in August: 6.8mph
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 (6.8mph).
Average humidity in August
Monmouth, IL
- Average humidity in August: 80%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (71%).
Average rainfall in August
Monmouth, IL
- Average rainfall in August: 2.13"
The wettest month (with the highest rainfall) is May (4.25").
The driest month (with the least rainfall) is January (1.46").
Average rainfall days in August
Monmouth, IL
- Average rainfall days in August: 14 days
The month with the highest number of rainy days is May (19 days).
The month with the least rainy days is February (5.8 days).
Average snowfall in August
Monmouth, IL
- Average snowfall in August: 0"
The month with the highest snowfall is January (4.61").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in August
Monmouth, IL
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (10.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in August /
Average sunshine in August
Monmouth, IL
- Average daylight in August: 13h and 5min
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 5min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in August
Monmouth, IL
- Average sunshine days in August: 13.8 days
The month with the most sunshine days is November (18 days).
The month with the least sunshine days is June (9.2 days).
Average UV index in August
Monmouth, IL
- Average UV index in August: 5
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in August
Monmouth, IL
- Average cloud cover in August: 30
The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are August and September (Cloud cover 30).
Average visibility in August
Monmouth, IL
- Average visibility in August: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
Monmouth, Illinois, USA
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