Arlington Heights Climate by Month
Arlington Heights, Illinois, United States
Warm summers and freezing winters, with rain spread through the year.
Warm summers and freezing winters, with rain spread through the year: that's Arlington Heights's climate in short. July is the warmest month, with highs around 84°F (29°C); January is the coolest at 32°F (0°C), and nights dip to 16°F (-9°C). It gets 37 in (940 mm) of rain a year, spread across the months.
- Warmest month
- 84°F(29°C)
- Average high, July
- Coldest nights
- 16°F(-9°C)
- Average low, January
- Rain per year
- 37 in(940 mm)
- No clear rainy season
- Humidity
- 72%
- Sunniest: July
Best and worst months in Arlington Heights
Best for weatherSeptember is the best time for weather in Arlington Heights: highs near 76°F (24°C) and about 3.3 in (85 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 32°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)
Arlington Heights weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 32°F(0°C) | 16°F(-9°C) | 1.9 in(48 mm) | 91% | 1.4 |
| FebFebruary | 36°F(2°C) | 19°F(-7°C) | 1.7 in(42 mm) | 78% | 2.4 |
| MarMarch | 47°F(9°C) | 29°F(-1°C) | 2.2 in(57 mm) | 76% | 3.6 |
| AprApril | 59°F(15°C) | 38°F(4°C) | 4.2 in(106 mm) | 60% | 4.5 |
| MayMay | 71°F(22°C) | 49°F(9°C) | 4.3 in(109 mm) | 63% | 5.1 |
| JunJune | 80°F(27°C) | 58°F(15°C) | 4.3 in(109 mm) | 70% | 5.8 |
| JulJuly | 84°F(29°C) | 63°F(17°C) | 3.5 in(89 mm) | 71% | 5.9 |
| AugAugust | 82°F(28°C) | 62°F(17°C) | 4.3 in(109 mm) | 74% | 5.1 |
| SepSeptemberBest | 76°F(24°C) | 55°F(13°C) | 3.3 in(85 mm) | 71% | 4.3 |
| OctOctober | 64°F(18°C) | 43°F(6°C) | 2.8 in(71 mm) | 65% | 2.7 |
| NovNovember | 49°F(9°C) | 31°F(0°C) | 2.4 in(62 mm) | 72% | 1.7 |
| DecDecember | 36°F(2°C) | 21°F(-6°C) | 2.1 in(53 mm) | 74% | 1.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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