Hartford weather in May: Hartford, Connecticut: normal highs, lows, rain and records for May
Hartford in May has a normal high of 72°F and a normal low of 48°F, a daily mean of 60°F, rising from 67°F on the 1st to 76°F by the 31st. Measurable precipitation falls on 12 days in a normal May, 3.79 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 22°C and low of 9°C, 96 mm of precipitation in May.
- NOAA stationHartford-Bradley International Airport
- Station IDUSW00014740
- Location41.94°N 72.68°W
- Elevation190 ft (58 m)
- From the center12 miles
- Population122,129
- Jan 35° 19°
- Feb 39° 21°
- Mar 47° 28°
- Apr 61° 38°
- May 72° 48°
- Jun 80° 58°
- Jul 85° 63°
- Aug 83° 62°
- Sep 76° 54°
- Oct 64° 42°
- Nov 52° 33°
- Dec 41° 25°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Hartford in May?
The normal high is 72°F and the normal low 48°F, for a daily mean of 60.0°F. May is 10.5°F warmer than April and 8.9°F cooler than June. May is the 5th warmest month of the year in Hartford and the 9th wettest. Across the month the normal high rises 9°F, from 67°F on May 1 to 76°F on May 31. From one year to the next May's mean temperature typically moves about 2.8°F either way (NOAA's standard deviation), so roughly two Mays in three average between 57°F and 63°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 |
|---|---|---|---|---|
| May 1 | 67°F | 44°F | 39% | 23% |
| May 8 | 70°F | 46°F | 39% | 23% |
| May 15 | 72°F | 48°F | 40% | 24% |
| May 22 | 73°F | 50°F | 40% | 24% |
| May 31 | 76°F | 53°F | 40% | 25% |
Every day of May: normal high, low and chance of precipitation (warmest afternoon May 31, coldest night May 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| May 1 | 67°F | 44°F | 39% | 23% | 14 h |
| May 2 | 68°F | 44°F | 39% | 23% | 14 h |
| May 3 | 68°F | 45°F | 39% | 23% | 14 h |
| May 4 | 68°F | 45°F | 39% | 23% | 14 h 10 min |
| May 5 | 69°F | 45°F | 39% | 23% | 14 h 10 min |
| May 6 | 69°F | 46°F | 39% | 23% | 14 h 10 min |
| May 7 | 69°F | 46°F | 39% | 23% | 14 h 10 min |
| May 8 | 70°F | 46°F | 39% | 23% | 14 h 20 min |
| May 9 | 70°F | 46°F | 40% | 23% | 14 h 20 min |
| May 10 | 70°F | 47°F | 40% | 24% | 14 h 20 min |
| May 11 | 71°F | 47°F | 40% | 24% | 14 h 20 min |
| May 12 | 71°F | 47°F | 40% | 24% | 14 h 30 min |
| May 13 | 71°F | 48°F | 40% | 24% | 14 h 30 min |
| May 14 | 71°F | 48°F | 40% | 24% | 14 h 30 min |
| May 15 | 72°F | 48°F | 40% | 24% | 14 h 30 min |
| May 16 | 72°F | 48°F | 40% | 24% | 14 h 30 min |
| May 17 | 72°F | 49°F | 40% | 24% | 14 h 40 min |
| May 18 | 72°F | 49°F | 40% | 24% | 14 h 40 min |
| May 19 | 73°F | 49°F | 40% | 24% | 14 h 40 min |
| May 20 | 73°F | 50°F | 40% | 24% | 14 h 40 min |
| May 21 | 73°F | 50°F | 40% | 24% | 14 h 40 min |
| May 22 | 73°F | 50°F | 40% | 24% | 14 h 40 min |
| May 23 | 74°F | 50°F | 40% | 25% | 14 h 50 min |
| May 24 | 74°F | 51°F | 40% | 25% | 14 h 50 min |
| May 25 | 74°F | 51°F | 40% | 25% | 14 h 50 min |
| May 26 | 74°F | 51°F | 40% | 25% | 14 h 50 min |
| May 27 | 75°F | 52°F | 40% | 25% | 14 h 50 min |
| May 28 | 75°F | 52°F | 40% | 25% | 14 h 50 min |
| May 29 | 75°F | 52°F | 40% | 25% | 15 h |
| May 30 | 75°F | 53°F | 40% | 25% | 15 h |
| May 31 | 76°F | 53°F | 40% | 25% | 15 h |
- Normal high
- 72°FMay average
- Normal low
- 48°FMay average
- Precipitation
- 3.79 inmonth total
- Days with precipitation
- 120.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 14 h to 15 hMay 1 to May 31
- Days at 70°F or more
- 18
- Days at 80°F or more
- 7
- Sunshine
- 70%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014740; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Hartford in May?
On a given May day the chance of 0.01 inch or more is 40% on average, highest around May 16 (40%). In all, 3.79 in falls on 12 days of a normal May, 1 of them with an inch or more.
In a normal May in Hartford, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014740.
How humid and windy is Hartford in May?
At 3 p.m. the normal temperature is 74°F with 46% relative humidity and a dew point of 52°F; at 6 a.m. it is 58°F with 82% humidity. The wind averages 7.6 mph, most often from the west-southwest in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 58°F | 52°F | 82% | 5.5 mph | – |
| 9 a.m. | 65°F | 53°F | 64% | 7.1 mph | – |
| noon | 72°F | 52°F | 50% | 9.5 mph | – |
| 3 p.m. | 74°F | 52°F | 46% | 10.7 mph | – |
| 6 p.m. | 70°F | 52°F | 52% | 9.9 mph | – |
| 9 p.m. | 63°F | 53°F | 68% | 7.3 mph | 38% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014740. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for May in Hartford?
The warmest May temperature on Hartford's official record (since 1905) is 99°F, on May 20, 1996; the coldest is 28°F, on May 10, 1947. The wettest May brought 12.00 in (1989); the snowiest, 1.3 inches (1977).
The May mean against the 1991-2020 normal of 60.0°F: 2021 59.8°F (−0.2), 2022 63.9°F (+3.9), 2023 59.1°F (−0.9), 2024 65.2°F (+5.2), 2025 60.5°F (+0.5), 2026 59.4°F (−0.6). 3 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 59.8°F | −0.2°F | 5.83 in |
| 2022 | 63.9°F | +3.9°F | 2.88 in |
| 2023 | 59.1°F | −0.9°F | 3.00 in |
| 2024 | 65.2°F | +5.2°F | 3.19 in |
| 2025 | 60.5°F | +0.5°F | 8.23 in |
| 2026 | 59.4°F | −0.6°F | 3.19 in |
Source: records: ACIS, NWS threaded record BDLthr; recent months: ACIS, station USW00014740. Records and recent months use complete months only.
How does May in Hartford compare across Connecticut?
Across the 13 places PlainClimate covers in Connecticut, May normal highs run from 65°F in Groton to 72°F in Stamford; Hartford's is 72°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.