Spanaway receives its highest rainfall in Nov, while humidity peaks during winter months.
🌧️ Wettest:Nov — 244 mm☀️ Driest:Jul — 26 mm
💧 Humidity peaks at 93% in Dec · annual avg 85%
🌍 Climate Summary
Avg Annual Temp:51.6°F
Avg Annual Rainfall:1554 mm
Avg Humidity:85%
Data Period:1981 – 2025
Spanaway Climate Overview
Spanaway has a temperate climate with warm summers and cold winters.
Temperatures peak in Aug and drop to their lowest in Dec,
while rainfall is highest during autumn months.
Humidity remains high throughout the year, especially during winter months, creating cold and damp conditions.
📈 Yearly Trends
The warmest year in Spanaway's recorded history was 1987
(avg: 54.3°F),
while the coldest year was 1985
(avg: 47.3°F),
based on annual average temperatures.
📊 Key Climate Trends
🌡️ Spanaway's temperature shows a slight warming trend over the past decade
📈 Minimum temperatures show a slight warming trend in recent years
🌧️ Rainfall varies year-to-year without a clear long-term trend
🌡️ Annual Temperature Trend
View Range:
Average annual high/low · Last 10 years · °F
Spanaway's temperatures shows a slight warming trend over the past decade.
The highest recorded temperature reached
107.2°F in Jun 2021,
while the lowest dropped to
-3°F in Dec 1990.
🌧️ Annual Precipitation
View Range:
Total annual precipitation · Last 10 years · mm/year
Annual rainfall in Spanaway shows noticeable variation. Rainfall varies year-to-year without a clear long-term trend.
Based on 45 years of data (1981–2025), Aug is typically the hottest month in Spanaway, Washington, with average high temperatures around 89.5°F.
What is the coldest month in Spanaway?▼
Dec is the coldest month in Spanaway, with average low temperatures around 19.4°F.
What is the rainiest month in Spanaway?▼
Nov receives the most rainfall with approximately 244 mm, while Jul is the driest with 26 mm.
What was the highest temperature ever recorded in Spanaway?▼
The highest recorded temperature was 107.2°F in Jun 2021. This is part of the historical record spanning 1981–2025.
What was the lowest temperature ever recorded in Spanaway?▼
The lowest recorded temperature was -3°F in Dec 1990.
How many years of data does this page cover?▼
This page covers 45 years of climate data from 1981 to 2025. As new data is added to the database the page automatically reflects the updated coverage.
How much sunlight does Spanaway get?▼
Spanaway receives the most sunlight in Jul with an average solar radiation of 6.20 kWh/m²/day. This solar radiation data, sourced from NASA POWER, is useful for solar energy planning, agriculture, and understanding seasonal sunshine availability in Washington.
Where does this weather data come from?▼
All climate data is sourced from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite and model data. It provides monthly averages for temperature, precipitation, humidity, wind speed, and solar radiation.
📚 Data Source
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources), a NASA project providing solar and meteorological data for renewable energy, building efficiency, and agricultural research.