Niantic, IL Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Niantic, a village in Macon County, Illinois.

This Afternoon

73°F

Light Rain Likely

Rain likely and a slight chance of thunderstorms. Mostly cloudy, with a high near 73. South southeast wind around 20 mph, with gusts as high as 29 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.

7-day forecast for Niantic

When	Temp	Forecast	Wind	Precip
This Afternoon	73°F	Light Rain Likely	20 mph SSE	69%
Tonight	54°F	Rain	14 to 18 mph S	80%
Wednesday	60°F	Slight Chance Light Rain then Mostly Cloudy	13 to 16 mph SW	18%
Wednesday Night	44°F	Mostly Cloudy	10 mph SW	1%
Thursday	61°F	Mostly Sunny	9 to 15 mph WSW	4%
Thursday Night	43°F	Mostly Cloudy then Slight Chance Light Rain	3 to 8 mph NW	22%
Friday	55°F	Mostly Cloudy	7 to 12 mph NNW	13%
Friday Night	36°F	Mostly Cloudy	2 to 9 mph NNW	6%
Saturday	54°F	Mostly Sunny	2 to 6 mph NW	1%
Saturday Night	34°F	Partly Cloudy	3 mph W	2%
Sunday	59°F	Sunny	2 to 10 mph W	9%
Sunday Night	34°F	Mostly Clear	3 to 7 mph WNW	5%
Monday	64°F	Sunny	3 to 12 mph SW	3%
Monday Night	39°F	Mostly Clear	5 to 8 mph WSW	2%

Forecast source: National Weather Service (api.weather.gov) for Niantic (39.854, -89.165). Updated through the day.

Growing snapshot for Niantic

Last spring frost

Apr 14

First fall frost

Oct 24

Growing season

192 days

Hardiness zone

More local growing data for Niantic: nearby ZIP 62551 weather · frost dates · planting calendar · Illinois frost dates

Nearby towns & communities

Argenta Boody Dalton City Decatur Elwin Forsyth Harristown Long Creek Macon Maroa Mount Zion Oreana Warrensburg

All Illinois locations ›

Climate data from the nearest NOAA station, Decatur Wtp, Il (11 mi from Niantic). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.