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 average high-temperature in September, at a still moderately hot 74.7°F (23.7°C), reveals a modest deviation from August's 79.5°F (26.4°C). Haverhill throughout September, experiences an average nighttime temperature of 55.4°F (13°C).Humidity
The average relative humidity in September 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
In Haverhill, snow does not fall in June through September.Daylight
The average length of the day in September in Haverhill, Iowa, is 12h and 28min.On the first day of September in Haverhill, Iowa, 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
In September, the average sunshine is 9.3h.UV index
In September, the average daily maximum UV index in Haverhill, Iowa, is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: An average UV index of 4 in September transforms into this advice:
Take necessary precautions - Protection from skin and eye injury is mandatory. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Frequently asked questions
What is the temperature in September in Haverhill?
What is the average humidity in September in Haverhill?
How much does it rain in Haverhill in September?
When it does not snow in Haverhill?
Does it snow in Haverhill in September?
What is the average length of the day in September in Haverhill?
What time are sunrise and sunset in September in Haverhill?
How many hours of sunshine does Haverhill have in September?
What is the UV index intensity in September in Haverhill?
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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