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Saint John, IN Weather Tomorrow

Use tomorrow's Saint John weather forecast and the next 5 day outlook to track daily precipitation forecasts, changing sky conditions, daytime highs, overnight lows, Fahrenheit and Celsius temperatures, sunrise, sunset, wind chill, and local wind details for the Saint John area and around Lake county, Indiana.
Updated: Thu Sep 17th 2026 1:45 AM CDT
Saint John, IN Weather – 9-17 – Light Rain Shower
77° / 68°
Light Rain Shower
Daytime highs will reach 77°F with lows dropping to 68°F in Saint John, where periods of rain are likely. The chance of rain is 91% with an estimated 0.3in. Winds will be light at 8mph and gusts of 15.7mph at 11 PM. High humidity with average of 94% is anticipated, the maximum being 98% at 3 AM and 78% being its lowest at 2 PM. Barometric pressure is its highest of 30.25inHg at 8 AM, a lowest point of 30.16inHg at 5 PM with an avg 30.2inHg.
Saint John, IN Weather – 9-18 – Mist
77° / 66°

Weather Tomorrow

Mist
In Saint John, mist is likely with a high near 77°F and a low around 66°F. There's a moderate 34% chance of rainfall with an estimated 0.01in. Wind will be moderate, blowing around 14mph on average and gusts of 28.7mph at 11 PM. High humidity with average of 84% is anticipated, the maximum being 97% at 3 AM and 66% being its lowest at 3 PM. Barometric pressure is its highest of 30.22inHg at 7 AM, a lowest point of 30.04inHg at 11 PM with an avg 30.16inHg.
Saint John, IN Weather – 9-19 – Scattered Showers
82° / 65°
Scattered Showers
Daytime highs will reach 82°F with lows dropping to 65°F in Saint John, where showers likely at times. Rainfall predicted to have a 75% chance with an estimated 0.1in. Wind will be moderate, blowing around 16mph on average and gusts of 33.3mph at 5 PM. High humidity with average of 84% is anticipated, the maximum being 98% at 5 AM and 64% being its lowest at 3 PM. Barometric pressure is its highest of 30.03inHg at 12 AM, a lowest point of 29.84inHg at 7 PM with an avg 29.92inHg.
Saint John, IN Weather – 9-20 – Light Rain Shower
73° / 60°
Light Rain Shower
Highs will reach 73°F with lows near 60°F in Saint John, where rain showers are. The chance of rain is 88% with an estimated 0.25in. Wind will be moderate, blowing around 14mph on average and gusts of 26mph at 9 PM. High humidity with average of 90% is anticipated, the maximum being 98% at 10 PM and 78% being its lowest at 3 PM. Barometric pressure is its highest of 30.03inHg at 11 PM, a lowest point of 29.85inHg at 12 AM with an avg 29.9inHg.
Saint John, IN Weather – 9-21 – Scattered Showers
74° / 55°
Scattered Showers
Saint John is set for scattered showers with temperatures peaking at 74°F and dipping to 55°F. Rainfall predicted to have a 74% chance with an estimated 0.09in. Wind will be moderate, blowing around 16mph on average and gusts of 29.1mph at 9 AM. High humidity with average of 81% is anticipated, the maximum being 98% at 7 AM and 68% being its lowest at 12 PM. Barometric pressure is its highest of 30.08inHg at 8 AM, a lowest point of 29.83inHg at 7 AM with an avg 29.92inHg.
Saint John, IN Weather – 9-22 – Sunny
69° / 58°
Sunny
In Saint John, a sunny day is likely with a high near 69°F and a low around 58°F. There's a very small chance of rainfall, only about 9%. Wind will be moderate, blowing around 14mph on average and gusts of 18.6mph at 4 AM. The humidity will be on the higher side, averaging about 75%, the maximum being 97% at 4 AM and 59% being its lowest at 1 PM. Barometric pressure is its highest of 30.06inHg at 11 PM, a lowest point of 29.9inHg at 12 AM with an avg 29.98inHg.

Currently

Light Rain Shower 69°F
30.21 inHg.
Barometer
98%
Humidity
ENE 5.4 mph
Wind
Light Rain Shower

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