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
The transition from August to September brings an average high-temperature of a still moderately hot 74.7°F (23.7°C), barely different from August's 79.5°F (26.4°C). In September, Haverhill encounters an average low-temperature of 55.4°F (13°C) during the night.Humidity
In September, the average relative humidity is 77%.Rainfall
In Haverhill, in September, it is raining for 9.5 days, with typically 1.14" (29mm) of accumulated precipitation. In Haverhill, during the entire year, the rain falls for 102 days and collects up to 10.59" (269mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 28min.On the first day of September, sunrise is at 6:38 am and sunset at 7:44 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 6:54 pm CDT.
Sunshine
The average sunshine in September is 9.3h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: The maximum UV index of 4 during September leads to these instructions:
Undertake protective steps - Recommendations to avoid sunburn are issued. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. 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 temperature in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow in Haverhill?
Does it snow in September?
How many hours of daylight does Haverhill have in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Haverhill have in September?
What is the UV index reading in September?
Average temperature in September
Haverhill, IA
- Average high temperature in September: 74.7°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (26.2°F).
- Average low temperature in September: 55.4°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 September
Haverhill, IA
- Average pressure in September: 30.02"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 September
Haverhill, IA
- Average wind speed in September: 8.2mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in September
Haverhill, IA
- Average humidity in September: 77%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Haverhill, IA
- Average rainfall in September: 1.14"
The wettest month (with the highest rainfall) is May (1.69").
The driest months (with the least rainfall) are January and February (0.35").
Average rainfall days in September
Haverhill, IA
- Average rainfall days in September: 9.5 days
The month with the highest number of rainy days is June (14.6 days).
The month with the least rainy days is February (2.3 days).
Average snowfall in September
Haverhill, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.54").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Haverhill, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Haverhill, IA
- Average daylight in September: 12h and 3min
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 September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in September
Haverhill, IA
- Average sunshine days in September: 18.6 days
The month with the most sunshine days is December (22.9 days).
The month with the least sunshine days is June (12.9 days).
Average UV index in September
Haverhill, IA
- Average UV index in September: 4
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 September
Haverhill, IA
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility in September
Haverhill, IA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Haverhill, Iowa, USA
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