Meridian (ID)
September
Weather in Meridian, Idaho for September 2026
Your guide to Meridian weather in September - trends and predictions
Until now, September 2026 in Meridian is cooler than usual, with temperatures averaging 25.1 °F, this is 2.3 °F below the typical seasonal average.
The forecast for the next days in Meridian predicts temperatures to be around 24 °F, close to the historical average.
In general, the average temperature in Meridian at the beginning of September is 29.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23.3 °F by the end of September.
With an average of 4 rainy days, Meridian experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
More
26
Dry days
4
Rainy days
0
Snow days
28°/13°
Temperatures
17 km/h
Avg max wind
43 %
Avg humidity
Meridian Weather September
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Temperatures trend during September in Meridian
See the weather trend as well as the moving average line
September weather in Meridian day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Partly cloudy | 35° /17° | 0.2 mm | 5 | |
| Sept. 2 |  Sunny | 33° /14° | 0.6 mm | 6 | |
| Sept. 3 |  Cloudy | 28° /14° | 19.2 mm | 4 | |
| Sept. 4 | Cloudy | 26° /13° | 18.7 mm | 4 | |
| Sept. 5 | Sunny | 29° /13° | 0 mm | 7 | |
| Sept. 6 |  Overcast | 29° /12° | 0.9 mm | 5 | |
| Sept. 7 | Cloudy | 25° /12° | 12.5 mm | 7 | |
| Sept. 8 | Partly cloudy | 29° /11° | 0 mm | 7 | |
| Sept. 9 | Overcast | 26° /11° | 0 mm | 6 | |
| Sept. 10 |  Thundery outbreaks possible | 29° /12° | 0.8 mm | 5 | |
| Sept. 11 | Sunny | 26° /12° | 0 mm | 6 | |
| Sept. 12 | Cloudy | 27° /11° | 0 mm | 5 | |
| Sept. 13 | Sunny | 27° /12° | 0.1 mm | 6 | |
| Sept. 14 |  Light rain shower | 22° /11° | 0.5 mm | 5 | |
| Sept. 15 |  Mist | 24° /10° | 0 mm | 6 | |
| Sept. 16 | Sunny | 27° /9° | 0 mm | 5 | |
| Sept. 17 | Sunny | 28° /13° | 0 mm | 5 | |
| Sept. 18 | Sunny | 26° /12° | 1.9 mm | 4 | |
| Sept. 19 | Overcast | 28° /14° | 0 mm | 5 | |
| Sept. 20 | Overcast | 26° /15° | 0 mm | 4 | |
| Sept. 21 |  Patchy light rain with thunder | 26° /14° | 1.6 mm | 5 | |
| Sept. 22 | Partly cloudy | 26° /11° | 0 mm | 4 | |
| Sept. 23 | Sunny | 31° /14° | 0 mm | 5.5 | |
| Sept. 24 | Sunny | 35° /17° | 0 mm | 5.3 | |
| Sept. 25 | Overcast | 28° /11° | 0 mm | 4.8 | |
| Sept. 26 | Overcast | 18° /5° | 0 mm | 4.8 | |
| Sept. 27 | Overcast | 21° /11° | 0 mm | 5 | |
| Sept. 28 | Sunny | 18° /8° | 0 mm | 5 | |
| Sept. 29 | Sunny | 18° /9° | 0 mm | 5 | |
| Sept. 30 | Sunny | 25° /15° | 0 mm | 6 | |
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Important Notice
Our weather forecast for Meridian 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 Meridian forecast closer to your planned date for the most up-to-date weather information.
Change Month
Meridian in September - FAQ
What are the expected maximum and minimum temperatures in Meridian during September?
Enjoy moderate daytime temperatures of up to 28° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Meridian during September?
In September, Meridian can expect light to moderate rainfall, totaling 23.2 mm across approximately 4 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Meridian during September?
The average wind speed in Meridian during September is 17 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Meridian
Explore the daily rainfall trends and prepare for Meridians September weather 💧
Typically, Meridian has 4 rainy days in September with a total of 23.2 mm of rainfall.
UV exposure in Meridian during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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