August
August · September · June
75climate match
United States · 1991–2020
Best time to visit
Acton.
August leads for comfortable weather in Acton: typically 27.3°C by day, 14.5°C at night, with 100 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortAugust
Typical high27.3°C
Typical low14.5°C
Rain in August100 mm
July
July · August · June
62climate match
May
May · September · June
76climate match
The weakest month is January, scoring 5 against August’s 75 — days reach only 0.3°C, 24° below the 24°C the score treats as ideal.
Month by month
The whole year,
without the guesswork.
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
Jan
50.3° / -10.5°
Feb
52.3° / -9.7°
Mar
56.8° / -4.9°
Apr
2714.2° / 1°
May
5920.2° / 6.8°
Jun
7425° / 12.1°
Jul
7227.8° / 15.3°
Aug
7527.3° / 14.5°
Sep
7523.1° / 10.2°
Oct
3616.2° / 3.8°
Nov
79.4° / -1.1°
Dec
53.3° / -6.5°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 0.3°C | -10.5°C | 94 mm | 9 | 9 h 17 | 5 | Strong coverage |
| February | 2.3°C | -9.7°C | 90 mm | 7.3 | 10 h 25 | 5 | Strong coverage |
| March | 6.8°C | -4.9°C | 118 mm | 8.4 | 11 h 47 | 5 | Strong coverage |
| April | 14.2°C | 1°C | 109 mm | 8.6 | 13 h 21 | 27 | Strong coverage |
| May | 20.2°C | 6.8°C | 94 mm | 9.6 | 14 h 41 | 59 | Strong coverage |
| June | 25°C | 12.1°C | 116 mm | 9.9 | 15 h 24 | 74 | Strong coverage |
| July | 27.8°C | 15.3°C | 102 mm | 8.9 | 15 h 07 | 72 | Strong coverage |
| August | 27.3°C | 14.5°C | 100 mm | 7.6 | 13 h 58 | 75 | Strong coverage |
| September | 23.1°C | 10.2°C | 103 mm | 7.5 | 12 h 27 | 75 | Strong coverage |
| October | 16.2°C | 3.8°C | 132 mm | 8.5 | 10 h 56 | 36 | Strong coverage |
| November | 9.4°C | -1.1°C | 113 mm | 8.8 | 9 h 37 | 7 | Strong coverage |
| December | 3.3°C | -6.5°C | 119 mm | 9.6 | 8 h 58 | 5 | Strong coverage |
What has changed
Acton runs -0.2°C
on the 1961–1990 baseline.
Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.
Jan
0.0
Feb
-0.2
Mar
-0.9
Apr
-0.8
May
-1.6
Jun
-1.5
Jul
-0.1
Aug
-0.2
Sep
+0.6
Oct
-0.1
Nov
+0.6
Dec
+1.4
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 20.0°C6 Jan 2007 | -33.3°C18 Jan 1957 | 63 mm10 Jan 2024 | 269 mm1979 · driest 12 mm in 2004 | 73 |
| February | 23.3°C23 Feb 2018 | -31.7°C13 Feb 1967 | 84 mm25 Feb 1977 | 269 mm1981 · driest 1 mm in 1987 | 73 |
| March | 31.1°C31 Mar 1998 | -25.0°C19 Mar 1967 | 86 mm15 Mar 2010 | 410 mm2010 · driest 23 mm in 1965 | 72 |
| April | 33.3°C27 Apr 1962 | -16.1°C4 Apr 1954 | 89 mm10 Apr 1980 | 231 mm2004 · driest 12 mm in 2012 | 71 |
| May | 36.1°C19 May 1962 | -6.1°C18 May 1985 | 111 mm14 May 2006 | 395 mm2006 · driest 7 mm in 1959 | 71 |
| June | 37.2°C27 Jun 2025 | -0.6°C3 Jun 1986 | 115 mm3 Jun 2012 | 347 mm1998 · driest 22 mm in 1979 | 72 |
| July | 36.7°C20 Jul 1991 | 3.3°C3 Jul 1962 | 71 mm10 Jul 2021 | 332 mm2021 · driest 23 mm in 1968 | 71 |
| August | 38.3°C2 Aug 1975 | -0.6°C30 Aug 1965 | 120 mm19 Aug 1991 | 325 mm1991 · driest 7 mm in 2001 | 72 |
| September | 35.0°C8 Sep 1960 | -5.6°C30 Sep 2018 | 178 mm12 Sep 1960 | 306 mm1999 · driest 12 mm in 2020 | 72 |
| October | 31.7°C7 Oct 1963 | -11.1°C31 Oct 1966 | 208 mm21 Oct 1996 | 421 mm2005 · driest 7 mm in 1994 | 73 |
| November | 25.0°C6 Nov 2022 | -18.3°C24 Nov 1989 | 98 mm2 Nov 1988 | 357 mm1983 · driest 17 mm in 1976 | 73 |
| December | 22.8°C7 Dec 1998 | -28.9°C31 Dec 1963 | 74 mm21 Dec 1993 | 259 mm1969 · driest 20 mm in 1980 | 72 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | 4 | 4 |
| February | 0 | 0 | 27 | 3 | 3 |
| March | <1 | 0 | 26 | 4 | 2 |
| April | 2 | <1 | 14 | 4 | <1 |
| May | 6 | 2 | 2 | 3 | 0 |
| June | 16 | 5 | 0 | 4 | 0 |
| July | 25 | 9 | 0 | 4 | 0 |
| August | 24 | 7 | 0 | 3 | 0 |
| September | 11 | 2 | <1 | 3 | 0 |
| October | 2 | 0 | 8 | 4 | 0 |
| November | 0 | 0 | 19 | 4 | <1 |
| December | 0 | 0 | 28 | 4 | 3 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 28% | 10% | 30% | -2.4–2.6°C |
| February | <1% | 27% | 11% | 29% | -0.6–5.0°C |
| March | 2% | 28% | 12% | 32% | 4.4–9.5°C |
| April | 13% | 30% | 12% | 36% | 12.0–16.2°C |
| May | 45% | 32% | 11% | 38% | 18.3–23.8°C |
| June | 64% | 32% | 11% | 38% | 23.1–27.6°C |
| July | 72% | 28% | 11% | 32% | 26.5–29.8°C |
| August | 74% | 26% | 9% | 26% | 25.8–28.8°C |
| September | 60% | 24% | 10% | 27% | 21.3–24.6°C |
| October | 22% | 26% | 11% | 29% | 14.5–18.3°C |
| November | 3% | 30% | 14% | 37% | 6.8–11.9°C |
| December | <1% | 30% | 13% | 35% | 0.1–5.8°C |
A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.
The evidence behind this page
Nearby, measured,
and named.
- Place identity
- GeoNames 4956462
- NOAA station
- USC00177479 · SANFORD 2 NNW
- Station distance
- 13.5 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 29 usable years
- Daylight
- Calculated from latitude 43.53°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.