Weatheo

Joliet weather by month

Warmest month

July

84°F (29°C) average high

Coolest month

January

18°F (-8°C) average low

Wettest month

June

4.5 in (115 mm) of rain

Driest month

February

1.6 in (40 mm) of rain

Average temperature and rainfall in Joliet by month

Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.

MonthAvg highAvg lowRecord low / highRainfallHumidityWind
January30°F18°F-10°F / 52°F
1.8 in
83%9 mph
February34°F20°F-11°F / 61°F
1.6 in
78%10 mph
March49°F32°F3°F / 74°F
2.9 in
74%10 mph
April60°F41°F24°F / 82°F
3.4 in
67%10 mph
May73°F53°F35°F / 93°F
4.1 in
68%9 mph
June83°F63°F47°F / 96°F
4.5 in
70%8 mph
July84°F66°F54°F / 96°F
3.5 in
76%6 mph
August82°F64°F50°F / 93°F
3.5 in
76%6 mph
September79°F60°F44°F / 91°F
2.8 in
74%7 mph
October65°F48°F26°F / 86°F
3.5 in
77%8 mph
November51°F38°F8°F / 71°F
2 in
79%9 mph
December40°F27°F-1°F / 66°F
1.8 in
80%9 mph

Frost and snow-likely months in Joliet

Nights in Joliet average 36°F (2°C) or below in 4 months (January, February, March and December). January, February, March and December combine average lows at or below 32°F (0°C) with 0.4 in (10 mm) or more of monthly precipitation, so precipitation then is likely to fall as snow. The coldest month is January with an average low of 18°F (-8°C) and a record low of -10°F (-24°C).

  • January: average low 18°F (-8°C), record low -10°F (-24°C), 1.8 in (45 mm) of precipitation — snow-likely
  • February: average low 20°F (-7°C), record low -11°F (-24°C), 1.6 in (40 mm) of precipitation — snow-likely
  • March: average low 32°F (0°C), record low 3°F (-16°C), 2.9 in (74 mm) of precipitation — snow-likely
  • December: average low 27°F (-3°C), record low -1°F (-18°C), 1.8 in (45 mm) of precipitation — snow-likely

These records carry temperature and precipitation, not snowfall totals.

Best time to visit Joliet

The most comfortable time to visit Joliet is generally May and August to September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around June, totalling about 35.4 in (900 mm) a year.

Travellers who prefer heat should aim for July, when highs average 84°F (29°C). June is the month to avoid if rain would spoil your plans — it averages 4.5 in (115 mm), roughly 3× the rainfall of the driest month (February).

Joliet climate: your questions

Does it snow in Joliet?

Yes, in winter: January, February, March and December average lows at or below 32°F (0°C) with 0.4 in (10 mm) or more of monthly precipitation, so some of it falls as snow. The coldest month is January (average low 18°F (-8°C), record low -10°F (-24°C)). Our records carry temperature and precipitation, not snowfall totals. What is falling now: Joliet weather today.

Will it snow in Joliet this winter?

Joliet's winter months average lows of 27°F (-3°C) in December, 18°F (-8°C) in January and 20°F (-7°C) in February, with about 5.1 in (130 mm) of precipitation across the three; 3 of them sit at or below 32°F (0°C), so snow is likely on the colder days. The records hold no snowfall totals. The next 15 days: Joliet 10-day forecast.

Which months are best for visiting Joliet?

May and August to September are the most comfortable months in Joliet, with highs near 78°F (26°C). July is the warmest month, averaging 84°F (29°C) by day; June is the wettest, with 4.5 in (115 mm); and January is the coolest, with lows near 18°F (-8°C). What it is doing today: Joliet weather today.

Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Joliet forecast for what is happening now.

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