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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

  • Until now, May 2026 in Washtenaw County is slightly cooler than the historical average by -1.1 °F.

  • The forecast for the next days in Washtenaw County predicts temperatures to be around 21 °F, close to the historical average.

  • In general, the average temperature in Washtenaw County at the beginning of May is 15.3 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 21.1 °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

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

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
16°
2
Patchy rain possible
15°
3
Overcast
14°
4
Moderate or heavy rain shower
16°
5
Overcast
15°
6
Moderate or heavy rain shower
14°
7
Overcast
17°
8
Heavy rain at times
16°
9
Sunny
17°
10
Sunny
19°
11
Sunny
15°
12
Partly cloudy
20°
13
Moderate or heavy rain shower
18°
14
Moderate or heavy rain shower
19°
15
Patchy rain possible
21°
16
Overcast
26°
17
Heavy rain at times
23°
18
Overcast
23°
19
Patchy rain possible
22°
20
Moderate rain at times
15°
21
Patchy rain possible
13°
22
Moderate rain at times
15°
23
Overcast
12°
24
Patchy rain possible
21°
25
Partly cloudy
24°
26
Sunny
26°
27
Patchy rain possible
25°
28
Sunny
22°
29
Sunny
20°
30
Overcast
13°
31
Partly cloudy
18°

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
 16° /4° 5.3 mm 5
May 2 Patchy rain possible
Patchy rain possible
 15° /5° 0.3 mm 7
May 3 Overcast
Overcast
 14° /3° 0.1 mm 5
May 4 Moderate or heavy rain shower
Moderate or heavy rain shower
 16° /6° 13.7 mm 6
May 5 Overcast
Overcast
 15° /7° 3.5 mm 4
May 6 Moderate or heavy rain shower
Moderate or heavy rain shower
 14° /7° 8.5 mm 6
May 7 Overcast
Overcast
 17° /5° 0.1 mm 7
May 8 Heavy rain at times
Heavy rain at times
 16° /4° 1.4 mm 5
May 9 Sunny
Sunny
 17° /3° 0.6 mm 6
May 10 Sunny
Sunny
 19° /5° 0 mm 7
May 11 Sunny
Sunny
 15° /4° 0 mm 7
May 12 Partly cloudy
Partly cloudy
 20° /5° 1.8 mm 8
May 13 Moderate or heavy rain shower
Moderate or heavy rain shower
 18° /10° 5.6 mm 4
May 14 Moderate or heavy rain shower
Moderate or heavy rain shower
 19° /10° 4.6 mm 6
May 15 Patchy rain possible
Patchy rain possible
 21° /10° 0.2 mm 8
May 16 Overcast
Overcast
 26° /14° 0.9 mm 7
May 17 Heavy rain at times
Heavy rain at times
 23° /13° 1.5 mm 7
May 18 Overcast
Overcast
 23° /13° 2.2 mm 7
May 19 Patchy rain possible
Patchy rain possible
 22° /12° 1.7 mm 5
May 20 Moderate rain at times
Moderate rain at times
 15° /6° 3.3 mm 5
May 21 Patchy rain possible
Patchy rain possible
 13° /8° 1.2 mm 3
May 22 Moderate rain at times
Moderate rain at times
 15° /7° 2.5 mm 6
May 23 Overcast
Overcast
 12° /7° 4.2 mm 2
May 24 Patchy rain possible
Patchy rain possible
 21° /12° 0.4 mm 5.4
May 25 Partly cloudy
Partly cloudy
 24° /12° 0 mm 8.2
May 26 Sunny
Sunny
 26° /12° 0 mm 8.4
May 27 Patchy rain possible
Patchy rain possible
 25° /16° 1.7 mm 6.7
May 28 Sunny
Sunny
 22° /11° 0 mm 8
May 29 Sunny
Sunny
 20° /8° 0 mm 0.7
May 30 Overcast
Overcast
 13° /5° 0 mm 2
May 31 Partly cloudy
Partly cloudy
 18° /8° 0 mm 4
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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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