Dayton Climate by Month
Dayton, Ohio, United States
Hot summers and cold winters, with rain spread through the year.
Hot summers and cold winters, with rain spread through the year: that's Dayton's climate in short. July is the warmest month, with highs around 87°F (30°C); January is the coolest at 38°F (3°C), and nights dip to 22°F (-6°C). About 40 in (1012 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 87°F(30°C)
- Average high, July
- Coldest nights
- 22°F(-6°C)
- Average low, January
- Rain per year
- 40 in(1012 mm)
- No clear rainy season
- Humidity
- 69%
- Sunniest: July
Best and worst months in Dayton
Best for weatherThe most comfortable weather comes in May and September, with highs around 78°F (25°C) and about 3.7 in (94 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; January is the coldest, with highs of only 38°F (3°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in May.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Dayton weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 38°F(3°C) | 22°F(-6°C) | 2.7 in(68 mm) | 72% | 1.6 |
| FebFebruary | 42°F(5°C) | 24°F(-4°C) | 2.3 in(59 mm) | 79% | 2.5 |
| MarMarch | 53°F(11°C) | 33°F(0°C) | 3.6 in(91 mm) | 65% | 3.6 |
| AprApril | 65°F(19°C) | 43°F(6°C) | 4.3 in(108 mm) | 63% | 4.5 |
| MayMayBest | 75°F(24°C) | 53°F(12°C) | 4.5 in(114 mm) | 68% | 5.2 |
| JunJune | 83°F(29°C) | 62°F(17°C) | 4.1 in(104 mm) | 65% | 5.7 |
| JulJuly | 87°F(30°C) | 65°F(19°C) | 3.6 in(91 mm) | 69% | 5.8 |
| AugAugust | 86°F(30°C) | 64°F(18°C) | 3.1 in(78 mm) | 68% | 5.3 |
| SepSeptemberBest | 80°F(27°C) | 56°F(13°C) | 2.9 in(73 mm) | 65% | 4.4 |
| OctOctober | 67°F(20°C) | 45°F(7°C) | 2.9 in(73 mm) | 65% | 3.0 |
| NovNovember | 53°F(12°C) | 34°F(1°C) | 3.0 in(75 mm) | 72% | 1.9 |
| DecDecember | 42°F(5°C) | 26°F(-3°C) | 3.1 in(78 mm) | 76% | 1.4 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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