Monthly climate averages for Ithaca, United States. Based on 10-year ERA5 reanalysis data.
Cfa Humid Subtropical
Climate OverviewIthaca, United States in May has warm conditions, with highs averaging 20.6°C (69°F). Rain falls on about 14 days this month.
This month falls at the end of Spring.
Daily highs in May gradually rise from around 18°C (65°F) at the start to 24°C (75°F) by month's end.
May sees fairly even rainfall, totalling about 103 mm across the month.
Expect around 7.1h of sunshine at the start of May, increasing to 10.0h by the end.
The warmest days tend to fall around the 27th, averaging 23.9°C (75°F).
Compared to April, this month is about 6°C warmer with 1 fewer rainy days. Temperatures will rise further into June.
Daily averages based on historical data (2016–2025)
Daytime temperatures around 21°C (69°F) are ideal for full-day outdoor exploration. Keep afternoons flexible as tropical showers are common — they typically clear within an hour.
Wet weather can spread across much of the day, so it is best to keep outdoor plans flexible.
2 of the last 5 yearly records were warmer than this month's long-run average.
| Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 2°C / -5°C | -3°C / -10°C | 13days (83 mm) Wet | 4.7h Fair | 76% Humid | 2.1 Moderate | Poor | View Details |
| February | 4°C / -5°C | 0°C / -10°C | 12days (82 mm) Wet | 5.8h Fair | 74% Muggy | 3.2 Moderate | Poor | View Details |
| March | 9°C / -1°C | 5°C / -5°C | 13days (85 mm) Wet | 7.2h Good | 70% Muggy | 4.2 Moderate | Poor | View Details |
| April | 15°C / 5°C | 12°C / 1°C | 15days (114 mm) Wet | 8.1h Good | 71% Muggy | 4.7 Moderate | Poor | View Details |
| May best | 21°C / 11°C | 21°C / 9°C | 14days (103 mm) Wet | 9.6h Good | 75% Muggy | 5.6 High | Good | View Details |
| June best | 25°C / 16°C | 27°C / 16°C | 12days (98 mm) Wet | 11.4h Excellent | 74% Muggy | 6.4 High | Excellent | View Details |
| July best | 28°C / 19°C | 31°C / 21°C | 13days (107 mm) Wet | 11.8h Excellent | 75% Muggy | 7 High | Good | View Details |
| August best | 27°C / 19°C | 29°C / 20°C | 12days (105 mm) Wet | 10.6h Excellent | 76% Humid | 5.9 High | Excellent | View Details |
| September best | 24°C / 15°C | 24°C / 15°C | 9days (88 mm) Wet | 8.9h Good | 78% Humid | 4.9 Moderate | Excellent | View Details |
| October | 17°C / 10°C | 16°C / 8°C | 12days (118 mm) Wet | 6.8h Fair | 78% Humid | 3.4 Moderate | Good | View Details |
| November | 9°C / 3°C | 6°C / -1°C | 14days (86 mm) Wet | 5.4h Fair | 76% Humid | 2.3 Moderate | Poor | View Details |
| December | 4°C / -2°C | 0°C / -7°C | 15days (93 mm) Wet | 4.4h Fair | 78% Humid | 1.7 Low | Poor | View Details |
Dress in layers — a mix of long sleeves, light sweaters, and a versatile jacket works best for changeable conditions.
A waterproof jacket or compact umbrella is recommended for occasional showers.
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