Merrimack County (Concord)
September
Weather in Merrimack County, New Hampshire for September 2027
Your guide to Merrimack County weather in September - trends and predictions
Merrimack County experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 378.4 mm.
Is September a good time to visit Merrimack County? check out the best time to travel to Merrimack County page.
✨ Is September a good time to visit Merrimack County? – Ask the AI Weatherman
Rain 🌧️
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20
Dry days
10
Rainy days
0
Snow days
22°/11°
Temperatures
13 km/h
Avg max wind
73 %
Avg humidity
Merrimack County Weather September
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Temperatures trend during September in Merrimack County
See the weather trend as well as the moving average line
September weather in Merrimack County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Heavy rain | 21° /13° | 89.8 mm | 4 | |
| Sept. 2 |  Fog | 22° /15° | 0.1 mm | 3 | |
| Sept. 3 | Heavy rain | 25° /13° | 75.4 mm | 4 | |
| Sept. 4 | Mist | 26° /13° | 0 mm | 6 | |
| Sept. 5 |  Moderate rain | 24° /14° | 12.1 mm | 5 | |
| Sept. 6 |  Moderate rain at times | 25° /15° | 5.5 mm | 3 | |
| Sept. 7 | Heavy rain | 21° /10° | 26.4 mm | 4 | |
| Sept. 8 | Mist | 24° /10° | 0 mm | 6 | |
| Sept. 9 |  Light rain | 23° /10° | 3.6 mm | 4 | |
| Sept. 10 | Light rain | 25° /13° | 9.7 mm | 5 | |
| Sept. 11 | Mist | 24° /9° | 0 mm | 6 | |
| Sept. 12 |  Sunny | 22° /8° | 0 mm | 6 | |
| Sept. 13 | Light rain | 20° /13° | 6.9 mm | 2 | |
| Sept. 14 | Fog | 23° /11° | 0 mm | 6 | |
| Sept. 15 |  Cloudy | 21° /10° | 0 mm | 6 | |
| Sept. 16 | Mist | 25° /12° | 0 mm | 5 | |
| Sept. 17 | Moderate rain | 24° /12° | 10.7 mm | 3 | |
| Sept. 18 | Fog | 25° /11° | 0 mm | 4 | |
| Sept. 19 |  Partly cloudy | 20° /9° | 0 mm | 5 | |
| Sept. 20 | Light rain | 15° /7° | 4.8 mm | 3 | |
| Sept. 21 | Partly cloudy | 19° /7° | 0.2 mm | 3 | |
| Sept. 22 |  Overcast | 19° /10° | 0 mm | 2 | |
| Sept. 23 | Cloudy | 21° /11° | 0 mm | 4 | |
| Sept. 24 | Heavy rain | 18° /10° | 71.5 mm | 3 | |
| Sept. 25 | Heavy rain | 21° /11° | 26.9 mm | 1 | |
| Sept. 26 | Moderate rain | 21° /15° | 14.7 mm | 2 | |
| Sept. 27 | Light rain | 18° /13° | 5.5 mm | 3 | |
| Sept. 28 | Moderate rain | 18° /13° | 13.3 mm | 2 | |
| Sept. 29 |  Patchy rain possible | 22° /12° | 1.1 mm | 3 | |
| Sept. 30 | Overcast | 22° /13° | 0 mm | 3 | |
| Next | |||||
Important Notice
Our weather forecast for Merrimack 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 Merrimack County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Merrimack County in September - FAQ
What are the expected maximum and minimum temperatures in Merrimack County during September?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Merrimack County during September?
Significant rainfall exceeding 378.4 mm is expected in Merrimack County during September, occurring over more than 10 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Merrimack County during September?
The average wind speed in Merrimack County during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Merrimack County
Explore the daily rainfall trends and prepare for Merrimack Countys September weather 💧
Typically, Merrimack County has 10 rainy days in September with a total of 378.4 mm of rainfall.
UV exposure in Merrimack County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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