Wedding weather data · USA
Wedding weather in Chicago
In Chicago, the driest months for a wedding are November and December, when rain falls on about 26% of days. The wettest is April, with rain on about 46% of days. Here is the full picture, month by month, from 10 years of daily weather records.
Rain odds and temperatures by month
| Month | Chance of a rainy day | Heavy rain | Rainy days | Avg high | Avg low | Sunshine |
|---|---|---|---|---|---|---|
| January | 34% | 6% | 10.4 | 32°F (0°C) | 20°F (-7°C) | 4.9 h/day |
| February | 31% | 6% | 8.7 | 36°F (2°C) | 20°F (-6°C) | 6.8 h/day |
| March | 37% | 9% | 11.6 | 45°F (7°C) | 31°F (-1°C) | 7.9 h/day |
| April | 46% | 11% | 13.9 | 54°F (12°C) | 39°F (4°C) | 8.8 h/day |
| May | 41% | 16% | 12.7 | 65°F (19°C) | 50°F (10°C) | 10.1 h/day |
| June | 40% | 14% | 11.9 | 77°F (25°C) | 61°F (16°C) | 11.7 h/day |
| July | 39% | 17% | 12.1 | 80°F (27°C) | 67°F (19°C) | 11.9 h/day |
| August | 39% | 13% | 12 | 80°F (26°C) | 66°F (19°C) | 11.5 h/day |
| September ✦ | 32% | 10% | 9.7 | 75°F (24°C) | 61°F (16°C) | 9.7 h/day |
| October | 38% | 15% | 11.9 | 62°F (17°C) | 49°F (9°C) | 7.5 h/day |
| November | 26% | 8% | 7.8 | 48°F (9°C) | 36°F (2°C) | 6 h/day |
| December | 29% | 7% | 8.9 | 39°F (4°C) | 27°F (-3°C) | 5 h/day |
Source: Open-Meteo Historical Weather API (ERA5 reanalysis), daily data 2015–2024 for 41.88, -87.63. Rainy day ≥ 1 mm, heavy rain ≥ 10 mm. Climatology, not a forecast.
Best months for a wedding in Chicago
Weighing low rain odds with comfortable temperatures (roughly 18–29 °C / 65–84 °F highs), the best months for an outdoor wedding in Chicago are September.
When to be careful
April is the wettest month in Chicago: rain falls on about 46% of days, and 11% of days bring heavy rain (10 mm or more). Book a solid backup if you marry then.
How to read these numbers
A "rainy day" is a day with at least 1 mm (0.04 in) of rain. A 30% chance means about 3 in 10 days in that month saw at least a little rain, often a short shower. For your exact date and venue, use our free rain odds tool.
Chicago weather month by month
What a wedding day in Chicago usually looks like in each month, from 10 years of daily weather records.
Chicago weather in January
In January, it rains (1 mm or more) on 34% of days in Chicago, about 10.4 days in the month, and 6% of days bring heavy rain. Typical highs are 32°F (0°C), lows 20°F (-7°C), with around 4.9 hours of sunshine a day. Average odds: plan outdoors, but book a rain plan you would actually like.
Chicago weather in February
In February, it rains (1 mm or more) on 31% of days in Chicago, about 8.7 days in the month, and 6% of days bring heavy rain. Typical highs are 36°F (2°C), lows 20°F (-6°C), with around 6.8 hours of sunshine a day. One of the driest months here: a good bet for an outdoor ceremony.
Chicago weather in March
In March, it rains (1 mm or more) on 37% of days in Chicago, about 11.6 days in the month, and 9% of days bring heavy rain. Typical highs are 45°F (7°C), lows 31°F (-1°C), with around 7.9 hours of sunshine a day. Average odds: plan outdoors, but book a rain plan you would actually like.
Chicago weather in April
In April, it rains (1 mm or more) on 46% of days in Chicago, about 13.9 days in the month, and 11% of days bring heavy rain. Typical highs are 54°F (12°C), lows 39°F (4°C), with around 8.8 hours of sunshine a day. One of the wettest months here: plan a covered ceremony or a tent from the start.
Chicago weather in May
In May, it rains (1 mm or more) on 41% of days in Chicago, about 12.7 days in the month, and 16% of days bring heavy rain. Typical highs are 65°F (19°C), lows 50°F (10°C), with around 10.1 hours of sunshine a day. One of the wettest months here: plan a covered ceremony or a tent from the start.
Chicago weather in June
In June, it rains (1 mm or more) on 40% of days in Chicago, about 11.9 days in the month, and 14% of days bring heavy rain. Typical highs are 77°F (25°C), lows 61°F (16°C), with around 11.7 hours of sunshine a day. One of the wettest months here: plan a covered ceremony or a tent from the start.
Chicago weather in July
In July, it rains (1 mm or more) on 39% of days in Chicago, about 12.1 days in the month, and 17% of days bring heavy rain. Typical highs are 80°F (27°C), lows 67°F (19°C), with around 11.9 hours of sunshine a day. Average odds: plan outdoors, but book a rain plan you would actually like.
Chicago weather in August
In August, it rains (1 mm or more) on 39% of days in Chicago, about 12 days in the month, and 13% of days bring heavy rain. Typical highs are 80°F (26°C), lows 66°F (19°C), with around 11.5 hours of sunshine a day. Average odds: plan outdoors, but book a rain plan you would actually like.
Chicago weather in September
In September, it rains (1 mm or more) on 32% of days in Chicago, about 9.7 days in the month, and 10% of days bring heavy rain. Typical highs are 75°F (24°C), lows 61°F (16°C), with around 9.7 hours of sunshine a day. Average odds: plan outdoors, but book a rain plan you would actually like.
Chicago weather in October
In October, it rains (1 mm or more) on 38% of days in Chicago, about 11.9 days in the month, and 15% of days bring heavy rain. Typical highs are 62°F (17°C), lows 49°F (9°C), with around 7.5 hours of sunshine a day. Average odds: plan outdoors, but book a rain plan you would actually like.
Chicago weather in November
In November, it rains (1 mm or more) on 26% of days in Chicago, about 7.8 days in the month, and 8% of days bring heavy rain. Typical highs are 48°F (9°C), lows 36°F (2°C), with around 6 hours of sunshine a day. One of the driest months here: a good bet for an outdoor ceremony.
Chicago weather in December
In December, it rains (1 mm or more) on 29% of days in Chicago, about 8.9 days in the month, and 7% of days bring heavy rain. Typical highs are 39°F (4°C), lows 27°F (-3°C), with around 5 hours of sunshine a day. One of the driest months here: a good bet for an outdoor ceremony.
Frequently asked questions
What is the best month to get married in Chicago?
Based on 10 years of weather data, November is the driest month in Chicago, with rain on about 26% of days and average highs around 48°F (9°C). Overall, the best months for an outdoor wedding there are September.
What is the rainiest month in Chicago?
April is the rainiest month in Chicago: on average 13.9 days of the month see at least 1 mm of rain, and about 11% of days bring heavy rain.
Will it rain on my wedding day in Chicago?
Nobody can forecast your wedding day months ahead. What history shows is the chance of rain: in September it rains on about 32% of days in Chicago. Check your exact date with our free rain odds tool, then watch the real forecast from about 7 days out.