Groton weather in June: Groton, Connecticut: normal highs, lows, rain and records for June
Groton in June has a normal high of 74°F and a normal low of 58°F, a daily mean of 66°F, rising from 69°F on the 1st to 78°F by the 30th. Measurable precipitation falls on 11 days in a normal June, 3.30 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 23°C and low of 15°C, 84 mm of precipitation in June.
- NOAA stationGroton New London Airport
- Station IDUSW00014707
- Location41.33°N 72.05°W
- Elevation10 ft (3 m)
- Population10,160
- Jan 38° 23°
- Feb 40° 25°
- Mar 47° 31°
- Apr 56° 39°
- May 65° 49°
- Jun 74° 58°
- Jul 80° 65°
- Aug 79° 64°
- Sep 74° 57°
- Oct 63° 46°
- Nov 53° 37°
- Dec 44° 29°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Groton in June?
The normal high is 74°F and the normal low 58°F, for a daily mean of 66.0°F. June is 9.2°F warmer than May and 6.3°F cooler than July. June is the 3rd warmest month of the year in Groton and the 7th wettest. Across the month the normal high rises 9°F, from 69°F on June 1 to 78°F on June 30. From one year to the next June's mean temperature typically moves about 1.5°F either way (NOAA's standard deviation), so roughly two Junes in three average between 65°F and 68°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 40%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| June 1 | 69°F | 54°F | 40% | 23% |
| June 8 | 71°F | 56°F | 38% | 23% |
| June 15 | 74°F | 58°F | 36% | 21% |
| June 22 | 76°F | 60°F | 33% | 19% |
| June 30 | 78°F | 63°F | 31% | 17% |
Every day of June: normal high, low and chance of precipitation (warmest afternoon June 30, coldest night June 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| June 1 | 69°F | 54°F | 40% | 23% | 15 h |
| June 2 | 69°F | 54°F | 40% | 23% | 15 h |
| June 3 | 70°F | 54°F | 40% | 23% | 15 h |
| June 4 | 70°F | 55°F | 40% | 23% | 15 h |
| June 5 | 70°F | 55°F | 39% | 23% | 15 h |
| June 6 | 71°F | 55°F | 39% | 23% | 15 h |
| June 7 | 71°F | 56°F | 39% | 23% | 15 h |
| June 8 | 71°F | 56°F | 38% | 23% | 15 h |
| June 9 | 72°F | 56°F | 38% | 22% | 15 h |
| June 10 | 72°F | 57°F | 38% | 22% | 15 h 10 min |
| June 11 | 72°F | 57°F | 37% | 22% | 15 h 10 min |
| June 12 | 73°F | 57°F | 37% | 22% | 15 h 10 min |
| June 13 | 73°F | 58°F | 37% | 22% | 15 h 10 min |
| June 14 | 73°F | 58°F | 36% | 21% | 15 h 10 min |
| June 15 | 74°F | 58°F | 36% | 21% | 15 h 10 min |
| June 16 | 74°F | 58°F | 36% | 21% | 15 h 10 min |
| June 17 | 74°F | 59°F | 35% | 20% | 15 h 10 min |
| June 18 | 75°F | 59°F | 35% | 20% | 15 h 10 min |
| June 19 | 75°F | 59°F | 35% | 20% | 15 h 10 min |
| June 20 | 75°F | 60°F | 34% | 20% | 15 h 10 min |
| June 21 | 76°F | 60°F | 34% | 19% | 15 h 10 min |
| June 22 | 76°F | 60°F | 33% | 19% | 15 h 10 min |
| June 23 | 76°F | 61°F | 33% | 19% | 15 h 10 min |
| June 24 | 77°F | 61°F | 33% | 18% | 15 h 10 min |
| June 25 | 77°F | 61°F | 32% | 18% | 15 h 10 min |
| June 26 | 77°F | 61°F | 32% | 18% | 15 h 10 min |
| June 27 | 77°F | 62°F | 32% | 18% | 15 h 10 min |
| June 28 | 78°F | 62°F | 32% | 17% | 15 h 10 min |
| June 29 | 78°F | 62°F | 32% | 17% | 15 h 10 min |
| June 30 | 78°F | 63°F | 31% | 17% | 15 h 10 min |
- Normal high
- 74°FJune average
- Normal low
- 58°FJune average
- Precipitation
- 3.30 inmonth total
- Days with precipitation
- 110.01 inch or more
- Daylight
- 15 h to 15 h 10 minJune 1 to June 30
- Days at 70°F or more
- 22
- Days at 80°F or more
- 5
- Sunshine
- 74%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014707; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Groton in June?
On a given June day the chance of 0.01 inch or more is 36% on average, highest around June 1 (40%). In all, 3.30 in falls on 11 days of a normal June, 1 of them with an inch or more.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014707.
What are the records for June in Groton?
The warmest June temperature on this station's record (since 1999) is 93°F, on June 25, 2025; the coldest is 40°F, on June 1, 2001. The wettest June brought 8.39 in (2013).
The June mean against the 1991-2020 normal of 66.0°F: 2021 66.6°F (+0.6), 2022 66.8°F (+0.8), 2023 66.2°F (+0.2), 2024 68.9°F (+2.9), 2025 67.4°F (+1.4), 2026 67.1°F (+1.1). 6 of 6 ran warmer than normal.
| June | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 66.6°F | +0.6°F | 1.22 in |
| 2022 | 66.8°F | +0.8°F | 2.43 in |
| 2023 | 66.2°F | +0.2°F | 1.89 in |
| 2024 | 68.9°F | +2.9°F | 4.76 in |
| 2025 | 67.4°F | +1.4°F | 0.76 in |
| 2026 | 67.1°F | +1.1°F | 3.15 in |
Source: records: ACIS, station USW00014707; recent months: ACIS, station USW00014707. Records and recent months use complete months only.
How does June in Groton compare across Connecticut?
Across the 13 places PlainClimate covers in Connecticut, June normal highs run from 73°F in Norfolk to 80°F in Hartford; Groton's is 74°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.