Boston
United States · North America
Year-round range: 22°F to 82°F
May
Excellent conditions this month
Your monthly fit score
Comfort fit by month.
Climate details▼
Temperature
Average highs and lows.
May has comfortable temperatures — not too hot, not too cold.
Shaded band = typical daily swing (P10 of night lows to P90 of afternoon peaks) — spans wider than avg high/low lines because it captures day-to-day variation.
| = MayPrecipitation
Monthly precipitation, wet-day risk, and snow signal where relevant.
May is one of the wetter months — pack rain gear.
Sunshine
Average hours of bright sun per day.
May has decent sunshine — a mix of sun and cloud.
Clear sky
Clear-sky share is the inverse of average cloud cover (100% minus cloud cover). Band labels follow standard meteorological categories; distribution within each band varies by day.
Air comfort by month
Humidity and heat feel by month.
May is mostly comfortable — low heat and humidity pressure.
Time-of-day patterns
Typical hourly rhythm for May.
Temperature by hour
Temperature by hour and month
Typical temperature through the day across the year (1996-2025 normals, local time). Shaded cells are nighttime.
In May, afternoons reach about 63° and nights settle near 52°.
▶Full month-by-month data
| Month | High °F | Low °F | Rain days | Rain (in) | Sun h/day | Humidity |
|---|---|---|---|---|---|---|
| Jan | 36°F | 22°F | 10 | 3.5in | 4h | 66.85714285714285% |
| Feb | 38°F | 23°F | 11 | 3.1in | 4.5h | 64.85714285714285% |
| Mar | 46°F | 30°F | 14 | 4.1in | 4.9h | 65.28571428571428% |
| Apr | 57°F | 40°F | 13 | 3.6in | 5.1h | 65.57142857142857% |
| May | 67°F | 50°F | 12 | 3.3in | 5.4h | 69.57142857142857% |
| Jun | 76°F | 60°F | 14 | 3.7in | 6.1h | 71.14285714285714% |
| Jul | 82°F | 66°F | 12 | 3.3in | 6.6h | 69.71428571428571% |
| Aug | 80°F | 65°F | 12 | 3.1in | 6.5h | 71.42857142857143% |
| Sep | 73°F | 59°F | 11 | 3.7in | 5.9h | 73.42857142857143% |
| Oct | 62°F | 48°F | 14 | 3.9in | 4.9h | 73% |
| Nov | 51°F | 38°F | 11 | 3.5in | 4.4h | 70% |
| Dec | 41°F | 29°F | 14 | 4.3in | 3.8h | 69.71428571428571% |
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Planning notes
Expect some rain.