Springfield Weather in August (1981–2025)

📍 39.79°N, 89.65°W •
📊

August at a Glance in Springfield

(1981–2025)
Avg High
🔥
29.5°C
Avg Low
❄️
17.9°C
Avg Temp
🌡️
23.7°C
Avg Rain
🌧️
89 mm
Avg Humidity
💧
71%
Avg Wind
🌬️
2.1 m/s
Avg Solar
☀️
5.6
kWh/m²/day
vs Annual
📈
+12.3°C
temp difference
🌡️Warm afternoons🌤️Cool mornings☀️Very sunny🌧️Wet month🍃Light winds😊Comfortable humidity

Springfield August Weather Overview

August is one of the warmer months of the year in Springfield, with average highs near 29.5°C and lows around 17.9°C (mean 23.7°C). It is about average for rainfall, averaging 89 mm of rainfall and 71% relative humidity across the period.

Springfield August Temperature History (1981–2025)

Range

August is one of the warmer months of the year in Springfield. Across 45 years of records, the warmest Augusts in Springfield were 1983 and 1988 — when the month averaged 27.3°C — while the coldest was 1992 at 19.9°C. Typical August days reach 29.5°C with nights near 17.9°C. The long-term August temperature trend is broadly flat.

1981–1985 vs 2021–2025

Avg Temp23.2°C→24.1°C+0.9°C
Max Temp29.1°C→29.8°C+0.7°C
Min Temp17.3°C→18.3°C+1°C

Trend (per decade)

Avg Temp+0.1°C/decade ↗
Max Temp0°C/decade →
Min Temp+0.2°C/decade ↗

Distribution of Avg Temp

19.0°C–21.3°C3 yr (7%)
21.3°C–23.5°C16 yr (36%)
23.5°C–25.8°C22 yr (49%)
25.8°C–28.0°C4 yr (9%)

Springfield August Rainfall History (1981–2025)

Range

August is about average for rainfall in Springfield, averaging 89 mm of rainfall. The wettest August on record was 1981 with 195 mm, while the driest was 2011 at 18 mm.

Springfield August Humidity History (1981–2025)

Range

Relative humidity in Springfield during August averages 71%. The most humid August was 1993 at 85%, and the least humid was 1988 at 53%.

Springfield August Solar History (1981–2025)

Range

August receives about 5.6 kWh/m²/day of solar energy in Springfield. The sunniest August was 2010 at 6.4 kWh/m²/day, and the cloudiest was 1985 at 4.7.

Springfield August Wind History (1981–2025)

Range

Average wind speed in Springfield during August is 2.1 m/s. The windiest Augusts were 1987, 2000 and 2004 at 2.5 m/s, while the calmest was 1995 at 1.6 m/s.

What August Feels Like in Springfield

🌅
Cool
Morning
🌞
Warm
Afternoon
🌆
Mild
Evening
Rain chanceModerate
Outdoor comfort★★★★☆

How August Ranks in Springfield

🔥2nd warmest month of the year
🌧️5th wettest month of the year
☀️4th sunniest month of the year

Ranked against the other 11 months using 1981–2025 averages.

Explore Springfield Weather by Month

Springfield August Averages by Decade

Metric1980s1990s2000s2010s2020sChange
Avg Temp23.8°C23.1°C24.1°C23.8°C24.0°C+0.2°C
Avg High29.9°C28.7°C29.9°C29.3°C29.7°C-0.2°C
Avg Low17.6°C17.5°C18.3°C18.3°C18.2°C+0.6°C
Avg Rain88 mm92 mm97 mm82 mm82 mm-6 mm

Extreme August Records in Springfield

🔥Warmest August40.8°C1988
🧊Coldest August6.9°C1986
🌧️Wettest August195 mm1981
🏜️Driest August18 mm2011
🌬️Windiest August2.5 m/s1987

Key Insights for August

✅

August temperatures in Springfield have risen by about 0.9°C between 1981–1985 and 2021–2025.

✅

August has ranged from a record low of 6.9°C (1986) to a record high of 40.8°C (1988).

✅

Rainfall in August is about average for rainfall, averaging 89 mm, with a wettest year of 195 mm.

✅

Daytime highs and overnight lows have shifted differently — highs rose about 0°C per decade while lows rose 0.2°C per decade, narrowing the gap between day and night.

Is August a Good Time to Visit Springfield?

One of the best times to visit Springfield

August is one of the best times to visit Springfield. Expect days averaging 29.5°C and nights around 17.9°C (mean 23.7°C) — warmer than Springfield's yearly average — with higher rainfall (89 mm), so conditions are generally comfortable for sightseeing and outdoor plans.

See Springfield's complete weather history All 12 months side by side, 1981–2025 records, annual trends and long-term averages in one place. View full history →

Springfield Weather in August — In Depth

☀️ August climate overview

August is one of the warmer months of the year in Springfield, with average highs near 29.5°C and lows around 17.9°C (mean 23.7°C). It is about average for rainfall, averaging 89 mm of rainfall and 71% relative humidity across the period.

🌧️ Rain, humidity & wind in August

August averages 89 mm of rainfall in Springfield, about average for rainfall compared with the rest of the year. The wettest August on record saw 195 mm (1981), and the driest just 18 mm (2011). Humidity sits around 71% and average wind speed is 2.1 m/s, with solar radiation averaging 5.6 kWh/m²/day.

📈 How August has changed

Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.9°C. Daytime highs moved from 29.1°C to 29.8°C and overnight lows from 17.3°C to 18.3°C over the same span.
August Weather in Springfield, Year by Year
🔥 warmest❄️ coldest🌧️ wettest
YearAvg HighAvg TempAvg LowHottest DayColdest DayRainfallHumidityWindSolar
202530.1°C23.9°C17.7°C36.4°C11.0°C30 mm67%2.1 m/s6.1
202430.1°C23.9°C17.8°C37.3°C10.0°C78 mm66%2.2 m/s5.7
202330.5°C24.3°C18.1°C38.7°C10.0°C126 mm70%2.1 m/s5.3
202229.9°C24.2°C18.4°C33.2°C13.5°C127 mm72%2.1 m/s5.9
202128.6°C24.0°C19.5°C32.5°C14.2°C106 mm81%1.9 m/s5.9
202029.1°C23.4°C17.6°C35.7°C13.0°C26 mm71%2 m/s6
201928.0°C23.0°C18.1°C31.5°C12.6°C101 mm78%2.1 m/s5.5
201830.1°C24.6°C19.2°C33.1°C14.0°C113 mm74%2.4 m/s5.6
201729.7°C23.0°C16.4°C35.3°C12.8°C55 mm63%2 m/s5.8
201628.6°C24.3°C20.0°C33.6°C14.4°C148 mm82%1.9 m/s5.2
201526.9°C21.8°C16.7°C30.6°C10.6°C50 mm79%2.1 m/s5.8
201428.8°C23.8°C18.8°C34.8°C11.6°C128 mm78%2.2 m/s5
201328.7°C23.1°C17.6°C36.1°C11.0°C27 mm75%1.8 m/s5.7
201232.2°C24.9°C17.7°C38.8°C13.0°C97 mm55%2.1 m/s5.8
201131.3°C25.0°C18.7°C37.5°C15.4°C18 mm67%2.1 m/s6
201029.1°C24.2°C19.3°C33.4°C12.5°C86 mm81%2 m/s6.4
200926.2°C21.4°C16.6°C31.2°C8.6°C115 mm83%2.4 m/s5.5
200826.8°C21.6°C16.4°C30.3°C11.7°C49 mm80%2 m/s6.1
200733.1°C27.0°C20.9°C39.0°C13.3°C61 mm67%2.4 m/s5.8
200630.0°C24.5°C19.0°C37.7°C14.5°C105 mm69%2.3 m/s5.2
200532.4°C26.2°C19.9°C37.1°C14.4°C77 mm62%2.1 m/s5.4
200427.8°C21.7°C15.5°C32.3°C9.4°C117 mm70%2.5 m/s5.4
200331.5°C25.2°C18.9°C39.5°C15.0°C116 mm66%2.2 m/s5.8
200228.3°C23.3°C18.3°C32.7°C12.8°C131 mm77%2.2 m/s5.4
200131.7°C25.2°C18.8°C37.3°C12.9°C109 mm64%2 m/s5.8
200031.3°C24.8°C18.3°C36.9°C13.4°C93 mm67%2.5 m/s5.5
199929.3°C22.8°C16.3°C35.6°C11.7°C108 mm64%2.2 m/s5.8
199827.9°C23.1°C18.2°C33.0°C14.9°C115 mm81%1.9 m/s5.5
199729.5°C23.5°C17.6°C36.6°C11.2°C113 mm69%2.3 m/s5.1
199630.6°C24.3°C17.9°C36.0°C14.2°C55 mm66%2.1 m/s5.9
199530.1°C25.4°C20.7°C33.1°C15.2°C100 mm80%1.6 m/s5.6
199428.3°C21.9°C15.6°C33.5°C8.9°C90 mm72%2.2 m/s5.3
199327.7°C23.4°C19.1°C32.0°C13.1°C122 mm85%1.9 m/s5.3
1992 ❄️25.8°C19.9°C14.1°C30.5°C9.5°C25 mm75%2.1 m/s5.6
199130.0°C24.1°C18.2°C37.7°C12.7°C108 mm67%2 m/s5.6
199027.9°C22.5°C17.1°C34.3°C9.8°C83 mm77%1.9 m/s5.5
198930.9°C24.7°C18.5°C36.5°C11.5°C102 mm64%2.2 m/s5.4
198834.3°C27.3°C20.3°C40.8°C10.1°C47 mm53%2.4 m/s5.6
198731.1°C24.7°C18.3°C38.7°C12.2°C89 mm65%2.5 m/s5.4
198627.4°C21.0°C14.6°C34.5°C6.9°C35 mm67%2.2 m/s5.7
198526.3°C21.0°C15.7°C30.3°C9.3°C137 mm80%2.1 m/s4.7
198431.4°C24.6°C17.7°C39.4°C10.8°C26 mm63%2.1 m/s5.7
1983 🔥34.2°C27.3°C20.4°C40.2°C13.7°C57 mm61%2 m/s—
198227.2°C21.6°C16.1°C32.8°C10.2°C103 mm77%2.1 m/s—
1981 🌧️26.5°C21.6°C16.7°C29.9°C10.6°C195 mm83%2.1 m/s—

Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.

Other Cities in Illinois

Springfield August Weather — FAQ

What is the average temperature in Springfield in August?▼

The average high in August is around 29.5°C with lows near 17.9°C (mean 23.7°C), based on 45 years of NASA POWER data.

Does it rain a lot in Springfield in August?▼

August averages 89 mm of rainfall in Springfield, about average for rainfall. The wettest on record was 195 mm in 1981.

What was the hottest August on record in Springfield?▼

The hottest August reached 40.8°C in 1988. The coldest dipped to 6.9°C in 1986.

Has August in Springfield gotten warmer over time?▼

Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.9°C. Daytime highs moved from 29.1°C to 29.8°C and overnight lows from 17.3°C to 18.3°C over the same span.

Is August a good time to visit Springfield?▼

August is one of the warmer months of the year in Springfield and about average for rainfall, so plan for around 29.5°C daytime highs and 17.9°C at night.

Is August the coldest month in Springfield?▼

Not quite — August is the 11th coolest month in Springfield, averaging 23.7°C.

What should I pack for Springfield in August?▼

For August in Springfield, pack light layers you can adjust through the day, with typical highs of 29.5°C and lows of 17.9°C. Bring an umbrella or light rain jacket too.

Is Springfield humid in August?▼

Relative humidity in August averages 71% — moderately humid.

How windy is Springfield in August?▼

Average wind speed in August is 2.1 m/s. The windiest August on record averaged 2.5 m/s (1987).

Which August had the most rainfall in Springfield?▼

The wettest August on record was 1981 with 195 mm. On average, August sees 89 mm.

Where does this August weather data come from?▼

All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.

Other Illinois cities

Explore how the weather in Springfield behaves each August, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for August specifically, along with year-by-year records and how the month has changed over the decades.