October weather in Groton, CT
The average temperature in Groton in October is 54.4°F (45.6°F–63.2°F). Average precipitation: 3.66 inches.
October is a fall month in Groton, and is warmer than the annual average of 51.4°F. Daily temperatures swing about 17.6°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 10h 52m. For travel, October is a comfortable month to visit.
Avg High
63.2°F
Avg Low
45.6°F
Precipitation
3.66 in
Daylight
10h 52m
October records in Groton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| October 1 | 79.0°F (2013) | 41.0°F (2009) | 0.90 in (2001) |
| October 2 | 87.1°F (2019) | 39.0°F (2009) | 0.94 in (2015) |
| October 3 | 75.9°F (2013) | 37.0°F (2003) | 1.19 in (2009) |
| October 4 | 84.0°F (2023) | 37.9°F (2008) | 0.94 in (2021) |
| October 5 | 78.1°F (2002) | 37.9°F (2004) | 0.61 in (2022) |
| October 6 | 78.1°F (2017) | 34.0°F (2003) | 0.53 in (2010) |
| October 7 | 77.0°F (2007) | 34.0°F (2003) | 0.88 in (2024) |
| October 8 | 80.1°F (2007) | 34.0°F (2001) | 1.39 in (2005) |
| October 9 | 86.0°F (2011) | 30.0°F (2001) | 0.91 in (2019) |
| October 10 | 86.0°F (2011) | 33.1°F (2025) | 0.31 in (2019) |
| October 11 | 75.9°F (2017) | 36.0°F (2009) | 1.00 in (2005) |
| October 12 | 73.9°F (2024) | 34.0°F (2009) | 1.14 in (2025) |
| October 13 | 71.1°F (2003) | 27.1°F (2012) | 0.87 in (2020) |
| October 14 | 79.0°F (2021) | 34.0°F (2006) | 4.64 in (2005) |
| October 15 | 75.9°F (2000) | 34.0°F (2002) | 2.16 in (2005) |
| October 16 | 72.0°F (2021) | 34.0°F (2006) | 2.84 in (2019) |
| October 17 | 75.0°F (2016) | 34.0°F (2012) | 0.72 in (2020) |
| October 18 | 73.9°F (2016) | 28.2°F (2015) | 0.67 in (2009) |
| October 19 | 77.0°F (2016) | 24.3°F (2015) | 1.25 in (2011) |
| October 20 | 72.0°F (2017) | 30.2°F (2009) | 1.98 in (2012) |
| October 21 | 75.0°F (2016) | 32.0°F (2008) | 0.59 in (2023) |
| October 22 | 73.0°F (2024) | 32.0°F (2002) | 0.53 in (2016) |
| October 23 | 72.0°F (2007) | 31.1°F (2008) | 0.20 in (2022) |
| October 24 | 73.9°F (2024) | 28.0°F (2002) | 1.14 in (2009) |
| October 25 | 73.9°F (2022) | 26.1°F (2003) | 1.33 in (2021) |
| October 26 | 72.0°F (2023) | 28.2°F (2013) | 1.97 in (2021) |
| October 27 | 70.0°F (2000) | 29.1°F (2006) | 2.47 in (2019) |
| October 28 | 75.0°F (2023) | 29.1°F (2013) | 2.81 in (2006) |
| October 29 | 70.0°F (2015) | 28.0°F (2001) | 2.58 in (2017) |
| October 30 | 79.0°F (2023) | 27.1°F (2020) | 0.90 in (2016) |
| October 31 | 73.0°F (2024) | 26.2°F (2020) | 0.45 in (2021) |