Climate guideThirty-year normals for Bothell, Washington
Bothell climate by month
Warm-summer Mediterranean · CsbBest Jul–Sep
Annual mean52°day and night
Seasonal swing24°warmest vs coolest
Precipitation41.0 in191 wet days a year
47.76° N, 122.21° WElevation 72 ftUTC−7 · Pacific Daylight Time
When to goBothell · weather score
Best timeJul–Sep
October: high / low60° / 45°
iSummary
What the weather is like
Bothell has a warm-summer Mediterranean climate (Köppen Csb): dry, sunny summers and mild, wetter winters.
The warmest month is August, when afternoons average 76° and nights 54°. December is the coolest month, with highs of 46° and lows of 36°. The difference between the warmest and the coolest month is about 24°.
About 41.0 in of precipitation falls in an average year. March is the wettest month (4.1 in, 22 wet days) and August the driest (1.0 in, 6 wet days). Cloud cover ranges from 26% in August to 54% in January.
Compared with Washington, the capital, Bothell is 6.6° cooler on a August afternoon and receives less precipitation over the year.
Year in figures
- Hottest afternoons
- 76° · August
- Coldest nights
- 36° · December
- Wettest month
- March
- Driest month
- August
- Clearest skies
- August · 26% cloud
- Longest day
- 15 h 59 min
- Shortest day
- 8 h 26 min
iiCharts
Twelve months at a glance
Temperature and precipitation
Daily high/low range bars, monthly precipitation columnsTemperature curve
Average high, lowDaylight
Hours between sunrise and sunset on the 15th of each monthiiiData table
Climate normals month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average high | 47° | 50° | 54° | 59° | 65° | 69° | 75° | 76° | 70° | 60° | 52° | 46° |
| Average low | 37° | 36° | 39° | 42° | 47° | 51° | 54° | 54° | 51° | 45° | 39° | 36° |
| Precipitation | 5.4 in | 3.6 in | 4.1 in | 2.8 in | 2.8 in | 2.1 in | 0.9 in | 1.0 in | 2.0 in | 4.1 in | 6.3 in | 5.9 in |
| Wet days (≥1 mm) | 20.4 | 17.7 | 21.9 | 18.6 | 15.5 | 13.9 | 6.7 | 6.2 | 11.7 | 16.7 | 20.7 | 20.8 |
| Cloud cover | 54% | 48% | 48% | 45% | 43% | 39% | 28% | 26% | 28% | 41% | 52% | 52% |
| Daylight | 8h 51 | 10h 16 | 11h 52 | 13h 38 | 15h 09 | 15h 59 | 15h 38 | 14h 18 | 12h 36 | 10h 54 | 9h 18 | 8h 26 |
| Month score | 15 | 18 | 30 | 44 | 62 | 63 | 84 | 85 | 72 | 48 | 21 | 16 |
ivMonth by month
Bothell in every month
January15
47° / 37°
5.4 in · 20.4 wet days
February18
50° / 36°
3.6 in · 17.7 wet days
March30
54° / 39°
4.1 in · 21.9 wet days
April44
59° / 42°
2.8 in · 18.6 wet days
May62
65° / 47°
2.8 in · 15.5 wet days
June63
69° / 51°
2.1 in · 13.9 wet days
July84
75° / 54°
0.9 in · 6.7 wet days
August85
76° / 54°
1.0 in · 6.2 wet days
September72
70° / 51°
2.0 in · 11.7 wet days
October48
60° / 45°
4.1 in · 16.7 wet days
November21
52° / 39°
6.3 in · 20.7 wet days
December16
46° / 36°
5.9 in · 20.8 wet days