Mason County (Lake Michigan)
September
Weather in Mason County, Michigan for September 2026
Your guide to Mason County weather in September - trends and predictions
So far, September 2026 in Mason County is slightly warmer than the historical average by 1.1 °F.
The forecast for the next days in Mason County predicts a temperature of 16.2 °F, which is cooler than the historical average.
In general, the average temperature in Mason County at the beginning of September is 21.6 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 19 °F by the end of September.
The climate of Mason County in September is notably wet, with an average of 11 rainy days, and a total of 154.7 mm of precipitation.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
19
Dry days
11
Rainy days
0
Snow days
20°/15°
Temperatures
22 km/h
Avg max wind
77 %
Avg humidity
Mason County Weather September
Move between months or click on a day
Temperatures trend during September in Mason County
See the weather trend as well as the moving average line
September weather in Mason County day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 23° /16° | 0 mm | 5 | |
| Sept. 2 |  Sunny | 22° /15° | 3 mm | 3 | |
| Sept. 3 | Sunny | 22° /15° | 55.2 mm | 5 | |
| Sept. 4 | Sunny | 22° /14° | 92 mm | 4 | |
| Sept. 5 |  Moderate or heavy rain shower | 23° /16° | 10.7 mm | 4 | |
| Sept. 6 |  Patchy rain possible | 20° /13° | 0.9 mm | 5 | |
| Sept. 7 | Patchy rain possible | 19° /12° | 3.3 mm | 4 | |
| Sept. 8 |  Partly cloudy | 21° /13° | 2.2 mm | 4 | |
| Sept. 9 | Sunny | 22° /16° | 5 mm | 4 | |
| Sept. 10 | Overcast | 21° /14° | 0 mm | 5 | |
| Sept. 11 |  Cloudy | 22° /14° | 0 mm | 5 | |
| Sept. 12 | Sunny | 23° /15° | 0 mm | 5 | |
| Sept. 13 | Sunny | 23° /16° | 20.7 mm | 5 | |
| Sept. 14 | Sunny | 24° /15° | 0.1 mm | 6 | |
| Sept. 15 | Sunny | 24° /15° | 12.9 mm | 4 | |
| Sept. 16 | Sunny | 23° /16° | 0 mm | 4 | |
| Sept. 17 | Overcast | 21° /15° | 0.1 mm | 4 | |
| Sept. 18 | Partly cloudy | 21° /15° | 0.4 mm | 4 | |
| Sept. 19 | Overcast | 20° /14° | 0.8 mm | 4 | |
| Sept. 20 | Moderate rain at times | 21° /15° | 6.1 mm | 4 | |
| Sept. 21 | Overcast | 19° /14° | 23.2 mm | 3 | |
| Sept. 22 | Moderate or heavy rain shower | 20° /13° | 7.6 mm | 3 | |
| Sept. 23 | Partly cloudy | 20° /16° | 10.5 mm | 5 | |
| Sept. 24 | Sunny | 20° /11° | 0 mm | 5.1 | |
| Sept. 25 | Overcast | 19° /14° | 0 mm | 5.1 | |
| Sept. 26 | Sunny | 17° /13° | 0 mm | 5 | |
| Sept. 27 | Overcast | 17° /14° | 0 mm | 4.5 | |
| Sept. 28 | Sunny | 18° /14° | 0 mm | 5 | |
| Sept. 29 | Overcast | 21° /15° | 0 mm | 5 | |
| Sept. 30 | Light rain shower | 21° /8° | 17.2 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for Mason 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 Mason County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Mason County in September - FAQ
What are the expected maximum and minimum temperatures in Mason County during September?
During September, expect a variety of temperatures with highs around 20° and lows near 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in Mason County during September?
Significant rainfall exceeding 154.7 mm is expected in Mason County during September, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Mason County during September?
The average wind speed in Mason County during September is 22 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Mason County
Explore the daily rainfall trends and prepare for Mason Countys September weather 💧
Typically, Mason County has 11 rainy days in September with a total of 154.7 mm of rainfall.
UV exposure in Mason County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in Mason County
Select a location for an accurate weather forecast
More Locations Quick links
More Mason County weather pages
You are here
Where is Mason County?Get accurate weather forecasts for Mason County, located at latitude 44.008 and longitude -86.757. Stay updated with localized weather information tailored for Mason County.
Found a mistake?
We appreciate your attention to details. Tell us here.