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What is Merrimack, NH, Weather Like in October?
During the month of October, Merrimack, NH,
has an average daytime high temperature of 63°F and an average overnight low temperature dropping to 39°F.
Around 4.84 inches of precipitation is received during the month,
with about 39.85 inches falling in a typical year.
As you might expect, snow is not common in the month of October.
Annually, Merrimack receives around 40.00 inches of snow.
October 2025: Actual vs. Average Temperatures
Showing temperatures through today (October 29, 2025)
Actual High
Average High
Actual Low
Average Low
Month Summary
Average High: 64.8 F
(+1.4 vs avg)
Average Low: 43.3 F
(+3.9 vs avg)
Nighttime temperatures were significantly above average.
Actual data from: MID_NAAN3
Merrimack, NH Daily Weather Averages for October
Recorded at Nashua 2 Nnw
(usc00275712),
5.2 miles
S of
Merrimack, NH
| Day | Avg Temps (°F) | Precip (in) | Snow (in) | Degree Days (°F) | |||||
|---|---|---|---|---|---|---|---|---|---|
| Low | High | Mean | Month | Year | Month | Year | Heat | Cool | |
| 10/1 | 45 F | 69 F | 57 F | 0.17" | 35.18" | 0.00" | 40.00" | 8.7 F | 0.6 F |
| 10/2 | 44 F | 69 F | 56 F | 0.34" | 35.35" | 0.00" | 40.00" | 9.1 F | 0.5 F |
| 10/3 | 44 F | 68 F | 56 F | 0.50" | 35.51" | 0.00" | 40.00" | 9.5 F | 0.5 F |
| 10/4 | 43 F | 68 F | 56 F | 0.66" | 35.67" | 0.00" | 40.00" | 9.8 F | 0.4 F |
| 10/5 | 43 F | 67 F | 55 F | 0.81" | 35.82" | 0.00" | 40.00" | 10.2 F | 0.3 F |
| 10/6 | 43 F | 67 F | 55 F | 0.96" | 35.97" | 0.00" | 40.00" | 10.6 F | 0.3 F |
| 10/7 | 42 F | 66 F | 54 F | 1.12" | 36.13" | 0.00" | 40.00" | 11 F | 0.2 F |
| 10/8 | 42 F | 66 F | 54 F | 1.27" | 36.28" | 0.00" | 40.00" | 11.3 F | 0.2 F |
| 10/9 | 41 F | 66 F | 53 F | 1.41" | 36.42" | 0.00" | 40.00" | 11.7 F | 0.2 F |
| 10/10 | 41 F | 65 F | 53 F | 1.56" | 36.57" | 0.00" | 40.00" | 12.1 F | 0.1 F |
| 10/11 | 41 F | 65 F | 53 F | 1.70" | 36.71" | 0.00" | 40.00" | 12.5 F | 0.1 F |
| 10/12 | 40 F | 64 F | 52 F | 1.84" | 36.85" | 0.00" | 40.00" | 12.9 F | 0.1 F |
| 10/13 | 40 F | 64 F | 52 F | 1.98" | 36.99" | 0.00" | 40.00" | 13.3 F | 0.1 F |
| 10/14 | 39 F | 64 F | 51 F | 2.12" | 37.13" | 0.00" | 40.00" | 13.7 F | 0.1 F |
| 10/15 | 39 F | 63 F | 51 F | 2.27" | 37.28" | 0.00" | 40.00" | 14 F | 0.1 F |
| 10/16 | 39 F | 63 F | 51 F | 2.42" | 37.43" | 0.00" | 40.00" | 14.4 F | N/A |
| 10/17 | 38 F | 62 F | 50 F | 2.58" | 37.59" | 0.00" | 40.00" | 14.8 F | N/A |
| 10/18 | 38 F | 62 F | 50 F | 2.74" | 37.75" | 0.00" | 40.00" | 15.2 F | N/A |
| 10/19 | 38 F | 62 F | 50 F | 2.90" | 37.91" | 0.00" | 40.00" | 15.5 F | N/A |
| 10/20 | 37 F | 61 F | 49 F | 3.07" | 38.08" | 0.00" | 40.00" | 15.9 F | N/A |
| 10/21 | 37 F | 61 F | 49 F | 3.23" | 38.24" | 0.00" | 40.00" | 16.3 F | N/A |
| 10/22 | 37 F | 60 F | 48 F | 3.39" | 38.40" | 0.00" | 40.00" | 16.6 F | N/A |
| 10/23 | 36 F | 60 F | 48 F | 3.55" | 38.56" | 0.00" | 40.00" | 17 F | N/A |
| 10/24 | 36 F | 60 F | 48 F | 3.72" | 38.73" | 0.00" | 40.00" | 17.3 F | N/A |
| 10/25 | 36 F | 59 F | 47 F | 3.88" | 38.89" | 0.00" | 40.00" | 17.7 F | N/A |
| 10/26 | 35 F | 59 F | 47 F | 4.04" | 39.05" | 0.00" | 40.00" | 18 F | N/A |
| 10/27 | 35 F | 58 F | 47 F | 4.20" | 39.21" | 0.00" | 40.00" | 18.3 F | N/A |
| 10/28 | 35 F | 58 F | 46 F | 4.36" | 39.37" | 0.00" | 40.00" | 18.7 F | N/A |
| 10/29 | 34 F | 58 F | 46 F | 4.52" | 39.53" | 0.00" | 40.00" | 19 F | N/A |
| 10/30 | 34 F | 57 F | 46 F | 4.68" | 39.69" | 0.00" | 40.00" | 19.3 F | N/A |
| 10/31 | 34 F | 57 F | 45 F | 4.84" | 39.85" | 0.00" | 40.00" | 19.7 F | N/A |
