Black Hawk County (Waterloo)
September
Weather in Black Hawk County, Iowa for September 2025
Your guide to Black Hawk County weather in September - trends and predictions
In general, the average temperature in Black Hawk County at the beginning of September is 23.3 °F. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 25.6 °F by the end of September.
Black Hawk County experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 62.9 mm.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
24
Dry days
6
Rainy days
0
Snow days
26°/13°
Temperatures
19 km/h
Avg max wind
63 %
Avg humidity
Black Hawk County Weather September
Move between months or click on a day
Temperatures trend during September in Black Hawk County
See the weather trend as well as the moving average line
September weather in Black Hawk County day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 22° /13° | 0 mm | 6 | |
| Sept. 2 | Sunny | 23° /9° | 0 mm | 6 | |
| Sept. 3 | Sunny | 24° /11° | 0 mm | 6 | |
| Sept. 4 | Sunny | 26° /11° | 0 mm | 7 | |
| Sept. 5 |  Patchy rain possible | 27° /15° | 0.1 mm | 6 | |
| Sept. 6 | Patchy rain possible | 21° /12° | 0.1 mm | 5 | |
| Sept. 7 | Sunny | 20° /7° | 0 mm | 6 | |
| Sept. 8 | Sunny | 24° /8° | 0 mm | 6 | |
| Sept. 9 | Sunny | 28° /12° | 0 mm | 7 | |
| Sept. 10 | Sunny | 28° /14° | 0 mm | 7 | |
| Sept. 11 | Sunny | 30° /14° | 0 mm | 8 | |
| Sept. 12 | Sunny | 29° /17° | 0 mm | 7 | |
| Sept. 13 |  Overcast | 27° /16° | 0.1 mm | 6 | |
| Sept. 14 | Patchy rain possible | 28° /17° | 0.7 mm | 6 | |
| Sept. 15 | Patchy rain possible | 30° /19° | 0.3 mm | 7 | |
| Sept. 16 |  Partly cloudy | 30° /18° | 0 mm | 7 | |
| Sept. 17 | Overcast | 27° /16° | 0 mm | 6 | |
| Sept. 18 |  Cloudy | 29° /16° | 0 mm | 6 | |
| Sept. 19 |  Heavy rain at times | 30° /18° | 12.5 mm | 7 | |
| Sept. 20 | Overcast | 28° /19° | 37.6 mm | 6 | |
| Sept. 21 | Patchy rain possible | 30° /17° | 7.5 mm | 7 | |
| Sept. 22 |  Moderate or heavy rain shower | 19° /13° | 3.7 mm | 4 | |
| Sept. 23 | Patchy rain possible | 21° /6° | 0.1 mm | 5 | |
| Sept. 24 | Patchy rain possible | 21° /11° | 0.2 mm | 5 | |
| Sept. 25 | Sunny | 25° /10° | 0 mm | 7 | |
| Sept. 26 | Overcast | 26° /12° | 0 mm | 6 | |
| Sept. 27 | Sunny | 26° /11° | 0 mm | 7 | |
| Sept. 28 | Overcast | 28° /13° | 0 mm | 6 | |
| Sept. 29 | Overcast | 27° /13° | 0 mm | 6 | |
| Sept. 30 |  Mist | 26° /12° | 0 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Black Hawk County in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Black Hawk County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Black Hawk County in September - FAQ
What are the expected maximum and minimum temperatures in Black Hawk County during September?
Enjoy moderate daytime temperatures of up to 26° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Black Hawk County during September?
Moderate rainfall is anticipated in Black Hawk County during September, with a total of 62.9 mm spread over approximately 6 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Black Hawk County during September?
The average wind speed in Black Hawk County during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Black Hawk County
Explore the daily rainfall trends and prepare for Black Hawk Countys September weather 💧
UV exposure in Black Hawk County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in Black Hawk County
Select a location for an accurate weather forecast
More Locations Quick links
More Black Hawk County weather pages
You are here
Where is Black Hawk County?Get accurate weather forecasts for Black Hawk County, located at latitude 42.493 and longitude -92.343. Stay updated with localized weather information tailored for Black Hawk County.
Found a mistake?
We appreciate your attention to details. Tell us here.