Effingham, United States experiences average highs of 19°C (66°F) and lows of 10°C (50°F) throughout the year. Rainfall is moderate, averaging about 10 rainy days per month. Sunshine is abundant, averaging about 9 hours per day. Average highs have stayed broadly stable across the available records.
Effingham, United States Weather & Climate 2026
Monthly climate averages for Effingham, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Mar–Jul At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.7/10
Best: May, June, August, September, October
UV Index
5
Low
Temperature 19°C / 10°C
Feels Like 18°C / 8°C
Rainy Days 10
Rainfall 99 mm
Sunshine 9 h
Humidity 67%
Wind Speed 17 km/h
Dew Point 8°C
Snow Days 3 days
Frost Days 13 days
Hottest Month
31°C
July
Avg Low22°C
Rain12days
Coldest Month
-3°C
January
Avg High4°C
Rain9days
Driest Month
6days
September
Avg High27°C
Avg Low18°C
Windiest Month
21 km/h
April (Gusts 45)
Worst Time to Visit
Consider avoiding January, February, December due to very cold temperatures.
Sun Position
Sunrise 05:29
Daylight 14.9h
Sunset 20:23
Live conditions—
Effingham on the map · live conditions
Effingham, United States
- Continent
- Americas
- Country
- United States
- City
- Effingham
- Population
- 12.6K
- Elevation
- 182 m
- Coordinates
- 39.12°, -88.54°
Seasonal Breakdown
Spring
Mar–May
Avg High 19°C
Avg Low 9°C
Rain 12 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 30°C
Avg Low 21°C
Rain 10 days/mo
2/3 best months
Autumn
Sep–Nov
Avg High 20°C
Avg Low 11°C
Rain 8 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 6°C
Avg Low -2°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: 4°C / -3°C . Feb: 8°C / -2°C . Mar: 14°C / 4°C . Apr: 19°C / 8°C . May: 24°C / 15°C . Jun: 30°C / 20°C . Jul: 31°C / 22°C . Aug: 29°C / 20°C . Sep: 27°C / 18°C . Oct: 20°C / 11°C . Nov: 12°C / 4°C . Dec: 7°C / 0°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 83 mm. Feb: 82 mm. Mar: 123 mm. Apr: 131 mm. May: 125 mm. Jun: 89 mm. Jul: 136 mm. Aug: 101 mm. Sep: 73 mm. Oct: 88 mm. Nov: 78 mm. Dec: 77 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 69%. Feb: 67%. Mar: 65%. Apr: 64%. May: 67%. Jun: 64%. Jul: 71%. Aug: 71%. Sep: 66%. Oct: 66%. Nov: 68%. Dec: 71%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 19 km/h . Feb: 20 km/h . Mar: 21 km/h . Apr: 21 km/h . May: 18 km/h . Jun: 16 km/h . Jul: 14 km/h . Aug: 13 km/h . Sep: 14 km/h . Oct: 18 km/h . Nov: 18 km/h . Dec: 18 km/h .
Sunshine
Sunshine
Sunshine: Jan: 5h. Feb: 7h. Mar: 8h. Apr: 9h. May: 10h. Jun: 12h. Jul: 12h. Aug: 11h. Sep: 10h. Oct: 8h. Nov: 7h. Dec: 5h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 3. Feb: UV 4. Mar: UV 5. Apr: UV 6. May: UV 7. Jun: UV 7. Jul: UV 7. Aug: UV 7. Sep: UV 6. Oct: UV 4. Nov: UV 3. 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: 5 days. Feb: 6 days. Mar: 2 days. Apr: 1 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 2 days. Dec: 3 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 · 31°C | Jul · 31°C |
| Coldest month | Jan 2025 · -8°C | Jan · -3°C |
| Wettest month | Apr 2025 · 149 mm | Jul · 136 mm |
| Windiest month | Mar 2025 · 23 km/h | Apr · 21 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Fair April
Good May best
Excellent June best
Excellent July
Good August best
Excellent September best
Excellent October best
Good November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 4°C / -3°C | 0°C / -8°C | 9days (83 mm) Wet | 5.3h Fair | 69% Muggy | 2.6 Moderate | Poor | View Details |
| February | 8°C / -2°C | 4°C / -6°C | 9days (82 mm) Wet | 6.7h Fair | 67% Muggy | 3.6 Moderate | Poor | View Details |
| March | 14°C / 4°C | 11°C / 0°C | 12days (123 mm) Wet | 7.6h Good | 65% Muggy | 5 Moderate | Fair | View Details |
| April | 19°C / 8°C | 17°C / 5°C | 11days (131 mm) Wet | 9h Good | 64% Muggy | 5.8 High | Good | View Details |
| May best | 24°C / 15°C | 24°C / 13°C | 13days (125 mm) Wet | 10h Excellent | 67% Muggy | 6.9 High | Excellent | View Details |
| June best | 30°C / 20°C | 32°C / 21°C | 10days (89 mm) Wet | 11.8h Excellent | 64% Muggy | 7.4 Very High | Excellent | View Details |
| July | 31°C / 22°C | 34°C / 24°C | 12days (136 mm) Wet | 11.8h Excellent | 71% Muggy | 7.4 Very High | Good | View Details |
| August best | 29°C / 20°C | 32°C / 22°C | 9days (101 mm) Wet | 11h Excellent | 71% Muggy | 6.8 High | Excellent | View Details |
| September best | 27°C / 18°C | 28°C / 18°C | 6days (73 mm) Good | 10.1h Excellent | 66% Muggy | 5.8 High | Excellent | View Details |
| October best | 20°C / 11°C | 19°C / 9°C | 9days (88 mm) Wet | 7.9h Good | 66% Muggy | 4.3 Moderate | Good | View Details |
| November | 12°C / 4°C | 9°C / 0°C | 8days (78 mm) Wet | 6.6h Fair | 68% Muggy | 3 Moderate | Poor | View Details |
| December | 7°C / 0°C | 4°C / -5°C | 9days (77 mm) Wet | 5.4h Fair | 71% Muggy | 2.3 Moderate | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Effingham are May, June, August, September, October, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Effingham, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Effingham is July, with average daytime highs of 31°C (87°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Effingham is January, with average overnight lows of -3°C (26°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Effingham is July, averaging 136mm of precipitation across 12 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Effingham runs through May, March, July, April, with the heaviest rainfall in May. Based on 10-year averages for Effingham.
Effingham receives approximately 103 sunshine hours per year. The sunniest month is June with around 12 hours. Based on climate data for Effingham.
The least favorable months to visit Effingham are January, February, December, primarily due to very cold temperatures. For the best conditions, consider May, June, August, September, October instead.
The annual average UV index in Effingham is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Effingham is 67%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Effingham receives snow. Months with snowfall average 3 snow days and 5 cm (2 in) of accumulation, with about 13 frost days during winter.
Average wind speeds in Effingham are 17 km/h (11 mph). The windiest month is April with peak winds reaching 21 km/h (13 mph) (gusts up to 45 km/h / 28 mph).
Effingham averages 5 clear-sky days per month with overall cloud cover around 56%. The clearest skies occur in September.
The annual average dew point in Effingham is 8°C (46°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Effingham has a Humid Subtropical climate, classified as Cfa under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Effingham ranges from 8°C (46°F) to 18°C (64°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
Yes, June is a great time to visit Effingham. It earns a climate score of 8.6/10 with Excellent.
For June in Effingham, pack Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. With average highs of 30°C (85°F) and 10 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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