easeweather.com
Whatcom County (North Cascades National Park)
Akron (OH)Albuquerque (NM)Alexandria (VA)Anaheim (CA)Anchorage (AK)Arlington (VA)Asheville (NC)Atlanta (GA)Atlantic City (NJ)Austin (TX)Baltimore (MD)Baton Rouge (LA)Birmingham (AL)Boston (MA)Bowling Green (KY)Brooklyn (NY)Buffalo (NY)Cape Coral (FL)Charlotte (NC)Chattanooga (TN)Chicago (IL)Cincinnati (OH)Cleveland (OH)Colorado Springs (CO)Columbus (OH)Corpus Christi (TX)Dallas (TX)Dayton (OH)Daytona Beach (FL)Denver (CO)Des Moines (IA)Detroit (MI)El Paso (TX)Fairbanks (AK)Fort Lauderdale (FL)Fort Wayne (IN)Fort Worth (TX)Gatlinburg (TN)Grand Rapids (MI)Harrisburg (PA)Honolulu (HI)Houston (TX)Huntsville (AL)Indianapolis (IN)Jackson (MS)Jacksonville (FL)Juneau (AK)Kansas City (MO)Ketchikan (AK)Key West (FL)Knoxville (TN)Las Vegas (NV)Lexington (KY)Lincoln (NE)Little Rock (AR)Los Angeles (CA)Louisville (KY)Madison (WI)Manhattan (NY)Memphis (TN)Miami (FL)Milwaukee (WI)Minneapolis (MN)Mobile (AL)Montgomery (AL)Nashville (TN)New Orleans (LA)New York City (NY)Newark (NJ)North Cascades National Park (WA)Oklahoma City (OK)Omaha (NE)Orlando (FL)Philadelphia (PA)Phoenix (AZ)Pittsburgh (PA)Portland (OR)Richmond (VA)Sacramento (CA)Salt Lake City (UT)San Antonio (TX)San Diego (CA)San Francisco (CA)San Jose (CA)Savannah (GA)Seattle (WA)Sitka (AK)Skagway (AK)Springfield (MO)St. Louis (MO)St. Petersburg (FL)Tallahassee (FL)Tampa (FL)Toledo (OH)Traverse City (MI)Tulsa (OK)Tyler (TX)Vancouver (WA)Virginia Beach (VA)WashingtonWinston-Salem (NC) More Locations
United States weather

Weather in Whatcom County, Washington for May 2027

Your guide to Whatcom County weather in May - trends and predictions

    Temperatures

  • In general, the average temperature in Whatcom County at the beginning of May is 19.4 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 17 °F by the end of May.

    • Rain 🌧️

  • Whatcom County experiences moderate rainfall in May, with an average of 10 rainy days and a total precipitation of 54.6 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
21
Dry days
Average rainy days
10
Rainy days
Average snowy days
0
Snow days
Average temperatures
17°/5°
Temperatures
Average wind speed
8 km/h
Avg max wind
Average humidity
67 %
Avg humidity

Whatcom County Weather May

Move between months or click on a day
April
June
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Partly cloudy
18°
2
Overcast
21°
3
Overcast
22°
4
Sunny
22°
5
Sunny
20°
6
Patchy rain possible
15°
7
Patchy rain possible
18°
8
Cloudy
13°
9
Overcast
20°
10
Partly cloudy
16°
11
Patchy rain possible
19°
12
Overcast
25°
13
Moderate or heavy rain shower
12°
14
Heavy rain at times
10°
15
Moderate rain at times
7°
16
Moderate or heavy rain shower
9°
17
Overcast
15°
18
Patchy rain possible
15°
19
Patchy rain possible
14°
20
Partly cloudy
20°
21
Patchy rain possible
21°
22
Patchy rain possible
20°
23
Overcast
18°
24
Partly cloudy
19°
25
Moderate rain at times
14°
26
Moderate rain at times
10°
27
Overcast
23°
28
Patchy rain possible
25°
29
Moderate rain at times
14°
30
Overcast
13°
31
Sunny
20°

Temperatures trend during May in Whatcom County

See the weather trend as well as the moving average line

May weather in Whatcom County day by day

Click on a date for more information
April June
Date Weather Temperatures Rain UV More
May 1 Partly cloudy
Partly cloudy
 18° /4° 0 mm 6
May 2 Overcast
Overcast
 21° /5° 0 mm 6
May 3 Overcast
Overcast
 22° /3° 0 mm 7
May 4 Sunny
Sunny
 22° /6° 0 mm 7
May 5 Sunny
Sunny
 20° /5° 0 mm 7
May 6 Patchy rain possible
Patchy rain possible
 15° /6° 0.3 mm 7
May 7 Patchy rain possible
Patchy rain possible
 18° /5° 0.2 mm 7
May 8 Cloudy
Cloudy
 13° /5° 0 mm 7
May 9 Overcast
Overcast
 20° /2° 0 mm 7
May 10 Partly cloudy
Partly cloudy
 16° /5° 0 mm 7
May 11 Patchy rain possible
Patchy rain possible
 19° /6° 0.1 mm 7
May 12 Overcast
Overcast
 25° /6° 0 mm 7
May 13 Moderate or heavy rain shower
Moderate or heavy rain shower
 12° /7° 17.7 mm 2
May 14 Heavy rain at times
Heavy rain at times
 10° /5° 5.4 mm 2
May 15 Moderate rain at times
Moderate rain at times
 7° /4° 5.5 mm 1
May 16 Moderate or heavy rain shower
Moderate or heavy rain shower
 9° /1° 12.9 mm 3
May 17 Overcast
Overcast
 15° /3° 0 mm 3
May 18 Patchy rain possible
Patchy rain possible
 15° /4° 0.9 mm 4
May 19 Patchy rain possible
Patchy rain possible
 14° /5° 1.7 mm 2
May 20 Partly cloudy
Partly cloudy
 20° /2° 0 mm 8
May 21 Patchy rain possible
Patchy rain possible
 21° /6° 0.2 mm 8
May 22 Patchy rain possible
Patchy rain possible
 20° /9° 0.2 mm 8
May 23 Overcast
Overcast
 18° /8° 0 mm 8
May 24 Partly cloudy
Partly cloudy
 19° /7° 0 mm 8
May 25 Moderate rain at times
Moderate rain at times
 14° /7° 3.5 mm 3
May 26 Moderate rain at times
Moderate rain at times
 10° /5° 4.2 mm 1
May 27 Overcast
Overcast
 23° /5° 0 mm 7
May 28 Patchy rain possible
Patchy rain possible
 25° /11° 0.2 mm 8
May 29 Moderate rain at times
Moderate rain at times
 14° /5° 1.6 mm 5
May 30 Overcast
Overcast
 13° /5° 0 mm 8
May 31 Sunny
Sunny
 20° /5° 0 mm 8
Next
Important Notice
Our weather forecast for Whatcom County in May is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Whatcom County forecast closer to your planned date for the most up-to-date weather information.
Change Month
‹
›

Whatcom County in May - FAQ

What are the expected maximum and minimum temperatures in Whatcom County during May?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 5°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Whatcom County during May?
Moderate rainfall is anticipated in Whatcom County during May, with a total of 54.6 mm spread over approximately 10 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Whatcom County during May?
The average wind speed in Whatcom County during May is 8 km/h, suggesting breezy to windy conditions, depending on your activities.

May rainfall patterns in Whatcom County

Explore the daily rainfall trends and prepare for Whatcom Countys May weather 💧
Typically, Whatcom County has 10 rainy days in May with a total of 54.6 mm of rainfall.

UV exposure in Whatcom County during May

Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
Top locations in Whatcom County
Select a location for an accurate weather forecast
North Cascades National Park
More Locations

Quick links

More Whatcom County weather pages
You are here
Location coordinates Where is Whatcom County?

Get accurate weather forecasts for Whatcom County, located at latitude 48.833 and longitude -121.347. Stay updated with localized weather information tailored for Whatcom County.

Found a mistake?
We appreciate your attention to details. Tell us here.