Peak in August
Coolest in December
Heavy in December
Peak in dry season
Seattle Monthly Weather Guide
Click any month to explore daily weather forecasts
January
February
March
April
May
June
July
August
September
October
November
December
Essential Travel Info for Seattle
Currency
USD
$ United States dollar
Language
English
Driving
Right side
Connect
The area code for the City of Seattle is...
Safety
Moderate Safety
GPI: 2.44
Best Time to Visit Seattle
Location, climate overview & historical trends
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📍 47.6062° N, 122.3321° W
Open in Google MapsSeattle is a prominent destination in United States.
Located at 47.61°N latitude,Seattle experiences a temperate climate with four distinct seasons.
Based on 30 years of data, August is the warmest month (avg. 24°C), while December is the coolest. December sees the most rain (50% chance), making July the driest month.
Historical Climate Trend
30-Year Analysis+1.06°C
Total over 30 years
+0.35°C
Per decade
Linear regression analysis of historical maximum temperatures for Seattle, based on 1995-2024 satellite data from NASA POWER.
Best Time to Visit
NASA POWER Data (1991-2021)May, June, July
Best months to visit
15°C
Avg High
Based on 30 years of NASA satellite data,Seattle receives approximately 918mm of rainfall annually. These months offer optimal temperatures and minimal rain probability for your visit.
Climate Trends
EXCLUSIVE1995-2040 Temperature Trend
1995 Avg
14.6°
2024 Avg
15.4°
2040 Proj
15.8°
+0.35°C
per decade (observed)
+0.28°C
per decade (CMIP6)
🌡️ Seattle has warmed by +1.1°C since 1995. By 2040, an additional +0.4°C is projected (based on CMIP6 rate of 0.279°C/decade), for a total of +1.5°C from 1995 baseline.
NASA POWER (1995-2024) + CMIP6 (CMCC_CM2_VHR4, EC_Earth3P_HR, FGOALS_f3_H, HiRAM_SIT_HR, MRI_AGCM3_2_S, NICAM16_8S)
Travel Intelligence
Exclusive flight analytics & health data for Seattle
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Airport-to-Airport Logistics
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Flight Connectivity Analysis
Airport traffic data & seasonal patterns
Extremely busy airport
0
slots per day
Peak
May
Low
Nov
Monthly Traffic Distribution
Key Connections
Health & Safety Advisory
CDC travel health recommendations
No Special Vaccinations Required
Standard travel precautions apply
Source: CDC Travelers' Health
View Complete Health GuideSeattle Climate Data by Month
Historical temperature and precipitation averages
| Month | Avg High (°C) | Rain Probability (%) | Status |
|---|---|---|---|
| January | 7°C | 47% | 🌧️ Rainy |
| February | 8°C | 40% | Neutral |
| March | 11°C | 43% | 🌧️ Rainy |
| April | 13°C | 34% | Neutral |
| May | 17°C | 25% | 😊 Pleasant |
| June | 20°C | 20% | ✨ Perfect |
| July | 24°C | 7% | ✨ Perfect |
| August | 24°C | 11% | ✨ Perfect |
| September | 21°C | 19% | ✨ Perfect |
| October | 15°C | 36% | Neutral |
| November | 10°C | 49% | 🌧️ Rainy |
| December | 7°C | 50% | 🌧️ Rainy |
Weather in Cities Near Seattle
Explore climate data for popular destinations within easy reach
Victoria
Canada
Vancouver
Canada
Portland
United States
Whistler
Canada
Banff
Canada
Calgary
Canada
Compare weather conditions with nearby destinations for your trip planning
Compare Seattle Weather vs Popular Destinations
Similar Climate Destinations
Discover destinations with weather similar to Seattle
Almaty
Kazakhstan
Amsterdam
Netherlands
Antwerp
Belgium
Bariloche
Argentina
Basel
Switzerland
Berlin
Germany
These destinations share similar weather patterns with Seattle. Perfect alternatives if you're looking for the same climate in a different location.
Seattle Weather FAQ
When is the best time to visit Seattle?
Honestly, look for months with mild temperatures (20°C-25°C) and low rain chance. Based on historical data, May, June, July are usually great choices.
When is the hottest month in Seattle?
August is historically the hottest month in Seattle with average highs of 24°C.
When does it rain the most in Seattle?
December typically sees the highest probability of rain (50%).
Is Seattle expensive?
Prices vary by season. The "Perfect" weather months usually coincide with peak tourist season and higher prices, while the rainy or cold months offer better deals.