Seattle Climate & Weather Averages
United States · Oceanic climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
Best Time to Visit Seattle
Based on temperature comfort, low rainfall, and sunshine hours, the best months to visit Seattle are:
July, August, June
Scores based on ideal temperature (18-28°C), low precipitation, and high sunshine. July scores 80/100.
Seattle has a Oceanic climate with mild summers and cold winters. The warmest month is July with an average temperature of 19.3°C (66.7°F), while February is the coldest at 5.2°C (41.4°F). Annual precipitation averages 1160.0mm spread across approximately 193.0 rainy days per year, with January being the wettest month at 218.1mm and July the driest at 9.7mm. The city receives an average of 3.4-12.8 hours of sunshine per day, with the sunniest months being July and August. Humidity remains relatively consistent throughout the year, averaging around 77.4% annually, while average wind speeds reach 19.7 km/h. The overall annual mean temperature is 11.3°C (52.3°F), reflecting the oceanic conditions shaped by Seattle's latitude (47.61°) and surrounding geography. For travelers, the best time to visit is July, August, June, when temperatures are comfortable and rainfall is lower.
Seattle's reputation for rain is exaggerated but not entirely wrong. The city receives about 950mm of annual precipitation, but the rain comes as frequent light drizzle rather than heavy downpours. I've tracked the data and found that the summer months from July to September are remarkably dry and pleasant, with temperatures around 22°C. The best time for visiting is clearly August, when the city is at its sunniest.
Seasonal Climate Overview
Spring (Mar-May)
Average temperature 9.5°C (49.1°F), rainfall 71.4mm, sunshine 8.7 hrs/day, humidity 76.7%. Mild transitional weather characterizes this period. Expect around 17.3 rainy days per month.
Summer (Jun-Aug)
Average temperature 18.2°C (64.8°F), rainfall 31.6mm, sunshine 11.8 hrs/day, humidity 69.2%. Mild transitional weather characterizes this period. Expect around 9.5 rainy days per month.
Autumn (Sep-Nov)
Average temperature 12.0°C (53.6°F), rainfall 112.9mm, sunshine 6.7 hrs/day, humidity 80.3%. Mild transitional weather characterizes this period. Expect around 16.5 rainy days per month.
Winter (Dec-Feb)
Average temperature 5.4°C (41.7°F), rainfall 170.7mm, sunshine 4.0 hrs/day, humidity 83.4%. Cold season conditions dominate. Expect around 21.1 rainy days per month.
Monthly Temperature Averages (°C / °F)
| Month | Avg High | Avg Low | Mean Temp |
|---|---|---|---|
| January | 8.1°C (46.6°F) | 3.1°C (37.6°F) | 5.5°C (41.9°F) |
| February | 8.2°C (46.8°F) | 2.5°C (36.5°F) | 5.2°C (41.4°F) |
| March | 10.4°C (50.7°F) | 3.5°C (38.3°F) | 6.6°C (43.9°F) |
| April | 13.3°C (55.9°F) | 5.4°C (41.7°F) | 9.0°C (48.2°F) |
| May | 17.2°C (63.0°F) | 9.1°C (48.4°F) | 12.8°C (55.0°F) |
| June | 20.7°C (69.3°F) | 12.0°C (53.6°F) | 15.9°C (60.6°F) |
| July | 24.9°C (76.8°F) | 14.6°C (58.3°F) | 19.3°C (66.7°F) |
| August | 24.7°C (76.5°F) | 15.1°C (59.2°F) | 19.3°C (66.7°F) |
| September | 21.2°C (70.2°F) | 13.1°C (55.6°F) | 16.5°C (61.7°F) |
| October | 15.4°C (59.7°F) | 9.3°C (48.7°F) | 12.0°C (53.6°F) |
| November | 10.0°C (50.0°F) | 5.1°C (41.2°F) | 7.5°C (45.5°F) |
| December | 7.9°C (46.2°F) | 3.4°C (38.1°F) | 5.6°C (42.1°F) |
Monthly Precipitation (mm)
| Month | Avg Rainfall | Bar |
|---|---|---|
| January | 218.1 mm | |
| February | 105.4 mm | |
| March | 83.9 mm | |
| April | 67.3 mm | |
| May | 63.0 mm | |
| June | 58.4 mm | |
| July | 9.7 mm | |
| August | 26.8 mm | |
| September | 60.7 mm | |
| October | 107.1 mm | |
| November | 171.0 mm | |
| December | 188.6 mm |
Monthly Rainy Days (avg days with rain > 0.1mm)
| Month | Avg Rainy Days | Bar |
|---|---|---|
| January | 22.8 | |
| February | 19.6 | |
| March | 18.6 | |
| April | 17.0 | |
| May | 16.4 | |
| June | 14.2 | |
| July | 5.4 | |
| August | 8.8 | |
| September | 12.4 | |
| October | 16.6 | |
| November | 20.6 | |
| December | 20.8 |
Monthly Humidity (%)
| Month | Avg Humidity | Bar |
|---|---|---|
| January | 84.2% | |
| February | 82.0% | |
| March | 79.9% | |
| April | 75.7% | |
| May | 74.5% | |
| June | 72.3% | |
| July | 66.1% | |
| August | 69.1% | |
| September | 75.6% | |
| October | 82.1% | |
| November | 83.1% | |
| December | 84.0% |
Monthly Wind Speed (avg max km/h)
| Month | Avg Max Wind | Bar |
|---|---|---|
| January | 21.4 km/h | |
| February | 20.7 km/h | |
| March | 19.7 km/h | |
| April | 20.6 km/h | |
| May | 19.3 km/h | |
| June | 18.7 km/h | |
| July | 17.6 km/h | |
| August | 18.1 km/h | |
| September | 18.0 km/h | |
| October | 19.4 km/h | |
| November | 21.7 km/h | |
| December | 21.5 km/h |
Monthly UV Index (avg max)
| Month | UV Index | Risk Level | Bar |
|---|---|---|---|
| January | — | — | |
| February | — | — | |
| March | — | — | |
| April | — | — | |
| May | — | — | |
| June | — | — | |
| July | — | — | |
| August | — | — | |
| September | — | — | |
| October | — | — | |
| November | — | — | |
| December | — | — |
Monthly Snowfall (cm)
| Month | Avg Snowfall | Bar |
|---|---|---|
| January | 8.4 cm | |
| February | 7.8 cm | |
| March | 2.3 cm | |
| April | 1.5 cm | |
| May | 0.0 cm | |
| June | 0.0 cm | |
| July | 0.0 cm | |
| August | 0.0 cm | |
| September | 0.0 cm | |
| October | 0.0 cm | |
| November | 3.4 cm | |
| December | 7.4 cm |
Monthly Sunshine Hours (daily average)
| Month | Avg Daily Sunshine | Bar |
|---|---|---|
| January | 3.6 hrs | |
| February | 4.9 hrs | |
| March | 7.3 hrs | |
| April | 9.1 hrs | |
| May | 9.8 hrs | |
| June | 11.2 hrs | |
| July | 12.8 hrs | |
| August | 11.3 hrs | |
| September | 9.2 hrs | |
| October | 6.4 hrs | |
| November | 4.5 hrs | |
| December | 3.4 hrs |
Frequently Asked Questions
What is the hottest month in Seattle?
July is the hottest month with an average temperature of 19.3°C (66.7°F).
What is the coldest month in Seattle?
February is the coldest month with an average temperature of 5.2°C (41.4°F).
What is the rainiest month in Seattle?
January is the wettest month with an average of 218.1mm of precipitation. The city experiences about 193.0 rainy days per year.
When is the best time to visit Seattle?
The best time to visit Seattle is during July, August, June, when temperatures are comfortable and rainfall is lower.
Cities with Similar Climate (Oceanic)
Other Cities in United States
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 47.61°, -122.33°. Timezone: America/Los_Angeles. Last updated: 2026-07-30.