Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
As August makes way for September, Monrovia's average high-temperature eases from 83.5°F (28.6°C) to a still moderately hot 76.6°F (24.8°C). Throughout September, Monrovia encounters an average temperature drop to a refreshing 58.6°F (14.8°C).Humidity
In September, the average relative humidity in Monrovia is 77%.Rainfall
In Monrovia, during September, the rain falls for 14 days and regularly aggregates up to 2.32" (59mm) of precipitation. Throughout the year, in Monrovia, there are 161.7 rainfall days, and 31.89" (810mm) of precipitation is accumulated.Snowfall
April, June through October are months without snowfall.Daylight
In September, the average length of the day in Monrovia is 12h and 26min.On the first day of September, sunrise is at 6:38 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:52 pm EDT.
Sunshine
The average sunshine in September is 9h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. 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 average September temperature?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Monrovia, MD
- Average high temperature in September: 76.6°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in September: 58.6°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).
Average pressure in September
Monrovia, MD
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in September
Monrovia, MD
- Average wind speed in September: 5.4mph
The windiest month (with the highest average wind speed) is March (8mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).
Average humidity in September
Monrovia, MD
- Average humidity in September: 77%
The months with the highest relative humidity are May and October (79%).
The months with the lowest relative humidity are April and July (74%).
Average rainfall in September
Monrovia, MD
- Average rainfall in September: 2.32"
The wettest month (with the highest rainfall) is August (3.7").
The driest month (with the least rainfall) is February (2.01").
Average rainfall days in September
Monrovia, MD
- Average rainfall days in September: 14 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is February (9 days).
Average snowfall in September
Monrovia, MD
- Average snowfall in September: 0"
The month with the highest snowfall is March (3.31").
The months with the least snowfall are April, June, July, August, September and October (0").
Average snowfall days in September
Monrovia, MD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (6.7 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Monrovia, MD
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).
Average sunshine days in September
Monrovia, MD
- Average sunshine days in September: 13.7 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is July (10.9 days).
Average UV index in September
Monrovia, MD
- Average UV index in September: 4
The months with the highest UV index are May, 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 September
Monrovia, MD
- Average cloud cover in September: 37
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in September
Monrovia, MD
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
Monrovia, Maryland, USA
Weather forecast for your location
2. Allow the app to use your location