Ionia, United States experiences average highs of 15°C (59°F) and lows of 6°C (43°F) throughout the year. Rainfall is moderate, averaging about 10 rainy days per month. Average highs have stayed broadly stable across the available records.
Ionia, United States Weather & Climate 2026
Monthly climate averages for Ionia, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Apr–Oct At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.1/10
Best: June, July, August, September
UV Index
4
Low
Temperature 15°C / 6°C
Feels Like 13°C / 3°C
Rainy Days 10
Rainfall 78 mm
Sunshine 8 h
Humidity 70%
Wind Speed 18 km/h
Dew Point 5°C
Snow Days 7 days
Frost Days 17 days
Hottest Month
28°C
July
Avg Low19°C
Rain11days
Coldest Month
-7°C
January
Avg High0°C
Rain10days
Driest Month
8days
February
Avg High2°C
Avg Low-6°C
Windiest Month
21 km/h
February (Gusts 43)
Worst Time to Visit
Consider avoiding January, February, March, December due to very cold temperatures.
Sun Position
Sunrise 06:02
Daylight 15.3h
Sunset 21:22
Live conditions—
Ionia on the map · live conditions
Ionia, United States
- Continent
- Americas
- Country
- United States
- City
- Ionia
- Population
- 11.4K
- Elevation
- 219 m
- Coordinates
- 42.99°, -85.07°
Seasonal Breakdown
Spring
Mar–May
Avg High 14°C
Avg Low 4°C
Rain 12 days/mo
Summer
Jun–Aug
Avg High 27°C
Avg Low 17°C
Rain 11 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 16°C
Avg Low 8°C
Rain 10 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 1°C
Avg Low -5°C
Rain 9 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 0°C / -7°C . Feb: 2°C / -6°C . Mar: 8°C / -1°C . Apr: 14°C / 4°C . May: 21°C / 10°C . Jun: 26°C / 16°C . Jul: 28°C / 19°C . Aug: 27°C / 18°C . Sep: 24°C / 15°C . Oct: 16°C / 9°C . Nov: 8°C / 2°C . Dec: 3°C / -3°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 61 mm. Feb: 57 mm. Mar: 83 mm. Apr: 91 mm. May: 99 mm. Jun: 93 mm. Jul: 76 mm. Aug: 80 mm. Sep: 79 mm. Oct: 100 mm. Nov: 55 mm. Dec: 60 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 76%. Feb: 73%. Mar: 67%. Apr: 65%. May: 66%. Jun: 65%. Jul: 68%. Aug: 69%. Sep: 71%. Oct: 72%. Nov: 73%. Dec: 76%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 19 km/h . Feb: 21 km/h . Mar: 21 km/h . Apr: 20 km/h . May: 18 km/h . Jun: 18 km/h . Jul: 16 km/h . Aug: 15 km/h . Sep: 16 km/h . Oct: 18 km/h . Nov: 19 km/h . Dec: 19 km/h .
Sunshine
Sunshine
Sunshine: Jan: 4h. Feb: 6h. Mar: 8h. Apr: 9h. May: 10h. Jun: 12h. Jul: 12h. Aug: 11h. Sep: 9h. Oct: 7h. Nov: 5h. Dec: 4h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 3. Mar: UV 4. Apr: UV 5. May: UV 6. Jun: UV 7. Jul: UV 7. Aug: UV 6. Sep: UV 5. Oct: UV 4. Nov: UV 2. Dec: UV 2.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 14 days. Feb: 11 days. Mar: 6 days. Apr: 4 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 1 days. Nov: 5 days. Dec: 11 days.
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall is trending drier by about 9 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 28°C | Jul · 28°C |
| Coldest month | Jan 2025 · -9°C | Jan · -7°C |
| Wettest month | Jun 2025 · 126 mm | Oct · 100 mm |
| Windiest month | Mar 2025 · 23 km/h | Feb · 21 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Fair May
Good June best
Excellent July best
Excellent August best
Excellent September best
Excellent October
Good November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 0°C / -7°C | -5°C / -12°C | 10days (61 mm) Wet | 4.2h Fair | 76% Humid | 2 Low | Poor | View Details |
| February | 2°C / -6°C | -2°C / -11°C | 8days (57 mm) Wet | 6.4h Fair | 73% Muggy | 3.1 Moderate | Poor | View Details |
| March | 8°C / -1°C | 4°C / -6°C | 10days (83 mm) Wet | 7.7h Good | 67% Muggy | 4.2 Moderate | Poor | View Details |
| April | 14°C / 4°C | 11°C / 0°C | 13days (91 mm) Wet | 8.8h Good | 65% Muggy | 5.4 High | Fair | View Details |
| May | 21°C / 10°C | 20°C / 8°C | 13days (99 mm) Wet | 10.1h Excellent | 66% Muggy | 6.4 High | Good | View Details |
| June best | 26°C / 16°C | 27°C / 16°C | 11days (93 mm) Wet | 11.8h Excellent | 65% Muggy | 6.8 High | Excellent | View Details |
| July best | 28°C / 19°C | 30°C / 20°C | 11days (76 mm) Wet | 12h Excellent | 68% Muggy | 6.9 High | Excellent | View Details |
| August best | 27°C / 18°C | 28°C / 19°C | 10days (80 mm) Wet | 11.2h Excellent | 69% Muggy | 6.3 High | Excellent | View Details |
| September best | 24°C / 15°C | 24°C / 14°C | 9days (79 mm) Wet | 9.1h Good | 71% Muggy | 5 Moderate | Excellent | View Details |
| October | 16°C / 9°C | 14°C / 6°C | 12days (100 mm) Wet | 6.9h Fair | 72% Muggy | 3.5 Moderate | Good | View Details |
| November | 8°C / 2°C | 4°C / -3°C | 8days (55 mm) Wet | 5.4h Fair | 73% Muggy | 2.3 Moderate | Poor | View Details |
| December | 3°C / -3°C | -2°C / -8°C | 10days (60 mm) Wet | 4h Fair | 76% Humid | 1.7 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Ionia are June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Ionia, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Ionia is July, with average daytime highs of 28°C (82°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Ionia is January, with average overnight lows of -7°C (20°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Ionia is October, averaging 100mm of precipitation across 12 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Ionia runs through April, May, October, June, with the heaviest rainfall in April. Based on 10-year averages for Ionia.
Ionia receives approximately 98 sunshine hours per year. The sunniest month is July with around 12 hours. Based on climate data for Ionia.
The least favorable months to visit Ionia are January, February, March, December, primarily due to very cold temperatures. For the best conditions, consider June, July, August, September instead.
The annual average UV index in Ionia is 4, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Ionia is 70%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Ionia receives snow. Months with snowfall average 7 snow days and 12 cm (5 in) of accumulation, with about 17 frost days during winter.
Average wind speeds in Ionia are 18 km/h (11 mph). The windiest month is February with peak winds reaching 21 km/h (13 mph) (gusts up to 43 km/h / 27 mph).
Ionia averages 3 clear-sky days per month with overall cloud cover around 64%. The clearest skies occur in September.
The annual average dew point in Ionia is 5°C (41°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Ionia has a Hot-Summer Continental climate, classified as Dfa under the Köppen system. Continental climates experience extreme temperature ranges — hot summers and cold, snowy winters.
The 'feels like' temperature in Ionia ranges from 3°C (37°F) to 13°C (55°F) on average. Wind chill makes winters feel noticeably colder than the actual temperature — layered clothing is recommended.
Yes, June is a great time to visit Ionia. It earns a climate score of 8.4/10 with Excellent.
For June in Ionia, pack Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. With average highs of 26°C (79°F) and 11 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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