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Washtenaw County (Ann Arbor)
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United States weather

Weather in Washtenaw County, Michigan for May 2026

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

    Temperatures

  • In general, the average temperature in Washtenaw County at the beginning of May is 16.9 °F. As the month progressed, temperatures tended to slightly decrease, reaching an average of 16.6 °F by the end of May.

    • Rain 🌧️

  • The climate of Washtenaw County in May is notably wet, with an average of 15 rainy days, and a total of 99.4 mm of precipitation.

    • More

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Average dry days
16
Dry days
Average rainy days
15
Rainy days
Average snowy days
0
Snow days
Average temperatures
18°/9°
Temperatures
Average wind speed
21 km/h
Avg max wind
Average humidity
78 %
Avg humidity

Washtenaw County Weather May

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

Temperatures trend during May in Washtenaw County

See the weather trend as well as the moving average line

May weather in Washtenaw County day by day

Click on a date for more information
April June
Date Weather Temperatures Rain UV More
May 1 Moderate or heavy rain shower
Moderate or heavy rain shower
 22° /7° 7.7 mm 5
May 2 Patchy rain possible
Patchy rain possible
 20° /11° 0.6 mm 5
May 3 Overcast
Overcast
 13° /7° 0.1 mm 3
May 4 Moderate or heavy rain shower
Moderate or heavy rain shower
 10° /5° 27.4 mm 3
May 5 Overcast
Overcast
 17° /8° 5.4 mm 4
May 6 Moderate or heavy rain shower
Moderate or heavy rain shower
 15° /9° 17 mm 4
May 7 Overcast
Overcast
 21° /9° 0.2 mm 5
May 8 Heavy rain at times
Heavy rain at times
 15° /5° 2.4 mm 4
May 9 Sunny
Sunny
 16° /0° 0 mm 5
May 10 Sunny
Sunny
 24° /5° 0 mm 6
May 11 Sunny
Sunny
 17° /6° 0 mm 5
May 12 Partly cloudy
Partly cloudy
 25° /7° 0 mm 7
May 13 Moderate or heavy rain shower
Moderate or heavy rain shower
 22° /16° 8.5 mm 5
May 14 Moderate or heavy rain shower
Moderate or heavy rain shower
 22° /15° 9.1 mm 5
May 15 Patchy rain possible
Patchy rain possible
 27° /16° 0.4 mm 6
May 16 Overcast
Overcast
 28° /19° 0 mm 6
May 17 Heavy rain at times
Heavy rain at times
 20° /12° 2.8 mm 5
May 18 Overcast
Overcast
 16° /9° 0 mm 4
May 19 Patchy rain possible
Patchy rain possible
 16° /8° 0.2 mm 4
May 20 Moderate rain at times
Moderate rain at times
 12° /4° 6 mm 3
May 21 Patchy rain possible
Patchy rain possible
 13° /8° 1.2 mm 3
May 22 Moderate rain at times
Moderate rain at times
 9° /7° 4.8 mm 2
May 23 Overcast
Overcast
 11° /5° 0 mm 3
May 24 Overcast
Overcast
 15° /5° 0 mm 4
May 25 Overcast
Overcast
 17° /10° 0 mm 4
May 26 Fog
Fog
 18° /7° 0 mm 4
May 27 Overcast
Overcast
 16° /10° 0 mm 4
May 28 Overcast
Overcast
 14° /10° 0 mm 3
May 29 Fog
Fog
 16° /11° 0 mm 4
May 30 Overcast
Overcast
 16° /11° 3.2 mm 4
May 31 Overcast
Overcast
 19° /10° 2.3 mm 4
Next
Important Notice
Our weather forecast for Washtenaw 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 Washtenaw County forecast closer to your planned date for the most up-to-date weather information.
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Washtenaw County in May - FAQ

What are the expected maximum and minimum temperatures in Washtenaw County during May?
Enjoy moderate daytime temperatures of up to 18° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Washtenaw County during May?
Moderate rainfall is anticipated in Washtenaw County during May, with a total of 99.4 mm spread over approximately 15 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Washtenaw County during May?
The average wind speed in Washtenaw County during May is 21 km/h, suggesting breezy to windy conditions, depending on your activities.

May rainfall patterns in Washtenaw County

Explore the daily rainfall trends and prepare for Washtenaw Countys May weather 💧
Typically, Washtenaw County has 15 rainy days in May with a total of 99.4 mm of rainfall.

UV exposure in Washtenaw County during May

Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
Top locations in Washtenaw County
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Ann Arbor
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Location coordinates Where is Washtenaw County?

Get accurate weather forecasts for Washtenaw County, located at latitude 42.278 and longitude -83.741. Stay updated with localized weather information tailored for Washtenaw County.

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