Merrillville Climate by Month
Merrillville, Indiana, United States
Warm summers and freezing winters, with rain spread through the year.
The climate in Merrillville is one of warm summers and freezing winters, with rain spread through the year. Afternoon highs range from 33°F (0°C) in January to 84°F (29°C) in July, and January nights average 17°F (-8°C). It gets 40 in (1005 mm) of rain a year, spread across the months.
- Warmest month
- 84°F(29°C)
- Average high, July
- Coldest nights
- 17°F(-8°C)
- Average low, January
- Rain per year
- 40 in(1005 mm)
- No clear rainy season
- Humidity
- 75%
- Sunniest: July
Best and worst months in Merrillville
Best for weatherThe most comfortable weather comes in September, with highs around 77°F (25°C) and about 3.4 in (87 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 33°F (0°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 September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Merrillville weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 33°F(0°C) | 17°F(-8°C) | 2.1 in(54 mm) | 88% | 1.4 |
| FebFebruary | 37°F(3°C) | 20°F(-7°C) | 1.6 in(41 mm) | 76% | 2.4 |
| MarMarch | 48°F(9°C) | 29°F(-1°C) | 2.5 in(63 mm) | 75% | 3.6 |
| AprApril | 61°F(16°C) | 39°F(4°C) | 4.3 in(110 mm) | 66% | 4.4 |
| MayMay | 72°F(22°C) | 49°F(9°C) | 4.6 in(116 mm) | 67% | 5.1 |
| JunJune | 81°F(27°C) | 59°F(15°C) | 4.6 in(117 mm) | 68% | 5.8 |
| JulJuly | 84°F(29°C) | 63°F(17°C) | 4.0 in(101 mm) | 71% | 6.0 |
| AugAugust | 83°F(28°C) | 62°F(17°C) | 3.9 in(100 mm) | 74% | 5.2 |
| SepSeptemberBest | 77°F(25°C) | 54°F(12°C) | 3.4 in(87 mm) | 70% | 4.3 |
| OctOctober | 64°F(18°C) | 43°F(6°C) | 3.3 in(83 mm) | 72% | 2.8 |
| NovNovember | 49°F(10°C) | 33°F(0°C) | 2.9 in(74 mm) | 80% | 1.7 |
| DecDecember | 38°F(3°C) | 23°F(-5°C) | 2.3 in(59 mm) | 88% | 1.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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