August
August · July · June
78climate match
United States · 1991–2020
Best time to visit
Hartford.
August leads for comfortable weather in Hartford: typically 26.1°C by day, 13.8°C at night, with 95 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortAugust
Typical high26.1°C
Typical low13.8°C
Rain in August95 mm
July
July · August · June
61climate match
September
September · May · October
79climate match
The weakest month is January, scoring 5 against August’s 78 — days reach only -3.2°C, 27° 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
5-3.2° / -12.7°
Feb
5-1° / -11.1°
Mar
55.3° / -5.2°
Apr
2512.6° / 0.9°
May
5619.4° / 7.2°
Jun
7525° / 12.8°
Jul
7727.1° / 15°
Aug
7826.1° / 13.8°
Sep
7522.3° / 9.4°
Oct
4015° / 3.2°
Nov
66.8° / -3.1°
Dec
5-0.2° / -8.9°
| Month | Day | Night | Rain | Wet days | Sea | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|---|
| January | -3.2°C | -12.7°C | 40 mm | 7 | 3.2°C | 9 h 18 | 5 | Strong coverage |
| February | -1°C | -11.1°C | 32 mm | 5.5 | 2.1°C | 10 h 26 | 5 | Strong coverage |
| March | 5.3°C | -5.2°C | 45 mm | 6.6 | 2.0°C | 11 h 47 | 5 | Strong coverage |
| April | 12.6°C | 0.9°C | 87 mm | 8.6 | 3.2°C | 13 h 21 | 25 | Strong coverage |
| May | 19.4°C | 7.2°C | 98 mm | 9.9 | 5.7°C | 14 h 39 | 56 | Strong coverage |
| June | 25°C | 12.8°C | 122 mm | 9.4 | 12.2°C | 15 h 23 | 75 | Strong coverage |
| July | 27.1°C | 15°C | 99 mm | 7.5 | 19.1°C | 15 h 06 | 77 | Strong coverage |
| August | 26.1°C | 13.8°C | 95 mm | 7.8 | 21.0°C | 13 h 57 | 78 | Strong coverage |
| September | 22.3°C | 9.4°C | 79 mm | 7.2 | 18.6°C | 12 h 27 | 75 | Strong coverage |
| October | 15°C | 3.2°C | 70 mm | 8.1 | 13.0°C | 10 h 57 | 40 | Strong coverage |
| November | 6.8°C | -3.1°C | 51 mm | 5.9 | 7.9°C | 9 h 38 | 6 | Strong coverage |
| December | -0.2°C | -8.9°C | 43 mm | 6.8 | 5.0°C | 8 h 59 | 5 | Strong coverage |
What has changed
Hartford runs -0.5°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
+0.2
Feb
-0.6
Mar
+0.2
Apr
-1.9
May
-1.3
Jun
-0.9
Jul
-1.1
Aug
-1.0
Sep
+0.2
Oct
-0.7
Nov
-0.6
Dec
+1.4
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 12.8°C19 Jan 1996 | -37.2°C11 Jan 1979 | 51 mm23 Jan 1988 | 90 mm1988 · driest 3 mm in 2025 | 77 |
| February | 20.6°C28 Feb 2024 | -36.7°C2 Feb 1959 | 46 mm21 Feb 1997 | 89 mm2008 · driest 1 mm in 1995 | 77 |
| March | 28.3°C22 Mar 2012 | -30.6°C1 Mar 1962 | 53 mm31 Mar 1998 | 135 mm1976 · driest 5 mm in 2001 | 76 |
| April | 31.1°C22 Apr 1980 | -17.2°C7 Apr 1982 | 68 mm20 Apr 2023 | 202 mm2026 · driest 14 mm in 1898 | 76 |
| May | 34.4°C30 May 1999 | -6.7°C1 May 1978 | 69 mm18 May 2000 | 234 mm2004 · driest 15 mm in 1992 | 77 |
| June | 37.8°C21 Jun 1988 | -0.6°C9 Jun 1988 | 126 mm8 Jun 2008 | 358 mm2008 · driest 10 mm in 2012 | 77 |
| July | 40.6°C31 Jul 1999 | 3.9°C1 Jul 1965 | 100 mm21 Jul 1999 | 239 mm1999 · driest 30 mm in 1971 | 78 |
| August | 38.3°C1 Aug 1988 | 2.2°C27 Aug 1986 | 117 mm27 Aug 2018 | 255 mm2018 · driest 7 mm in 1969 | 77 |
| September | 36.1°C1 Sep 1953 | -5.0°C24 Sep 1976 | 132 mm10 Sep 1986 | 321 mm1965 · driest 10 mm in 1979 | 76 |
| October | 31.7°C1 Oct 1982 | -12.8°C27 Oct 1898 | 107 mm2 Oct 2019 | 194 mm2019 · driest 4 mm in 1975 | 76 |
| November | 23.9°C10 Nov 1999 | -23.9°C29 Nov 1976 | 68 mm4 Nov 2003 | 170 mm1985 · driest 6 mm in 1976 | 77 |
| December | 18.3°C6 Dec 2001 | -33.9°C19 Dec 1983 | 39 mm15 Dec 1971 | 110 mm2015 · driest 6 mm in 1976 | 77 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | 1 | 6 |
| February | 0 | 0 | 27 | <1 | 5 |
| March | <1 | 0 | 26 | 1 | 3 |
| April | 1 | <1 | 13 | 3 | <1 |
| May | 7 | 1 | 2 | 3 | 0 |
| June | 16 | 4 | 0 | 4 | 0 |
| July | 23 | 7 | 0 | 4 | 0 |
| August | 21 | 4 | 0 | 3 | 0 |
| September | 11 | 2 | <1 | 3 | 0 |
| October | 2 | <1 | 9 | 3 | <1 |
| November | 0 | 0 | 22 | 2 | 1 |
| December | 0 | 0 | 28 | 1 | 5 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 22% | 3% | 20% | -6.8–0.0°C |
| February | 0% | 18% | 3% | 14% | -4.9–3.1°C |
| March | 2% | 22% | 6% | 22% | 2.2–8.7°C |
| April | 14% | 29% | 10% | 33% | 10.0–16.2°C |
| May | 39% | 29% | 10% | 33% | 17.5–23.3°C |
| June | 64% | 29% | 11% | 34% | 23.6–27.5°C |
| July | 74% | 25% | 11% | 26% | 25.5–30.1°C |
| August | 72% | 26% | 10% | 26% | 24.5–29.1°C |
| September | 55% | 25% | 10% | 29% | 20.7–24.7°C |
| October | 20% | 26% | 7% | 29% | 12.9–18.5°C |
| November | 2% | 22% | 6% | 19% | 3.7–10.1°C |
| December | 0% | 21% | 4% | 20% | -4.1–2.8°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 5255628
- NOAA station
- USC00473453 · HARTFORD WWTP
- Station distance
- 3.1 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 29 usable years
- Daylight
- Calculated from latitude 43.32°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Sea temperature
- NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 41 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.