Boston (MA)
May
Weather in Boston, Massachusetts for May 2026
Your guide to Boston weather in May - trends and predictions
Special Weather Statement - See hour by hour.
So far, May 2026 in Boston is slightly warmer than the historical average by 1.4 °F.
The forecast for the upcoming days in Boston predicts a temperature of 20.1 °F, which is slightly above the historical average.
In general, the average temperature in Boston at the beginning of May is 15.4 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 19.7 °F by the end of May.
Boston experiences heavy rainfall in May, with over 20 rainy days and an average total precipitation 155.5 mm.
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Temperatures
Rain 🌧️
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10
Dry days
21
Rainy days
0
Snow days
18°/10°
Temperatures
17 km/h
Avg max wind
68 %
Avg humidity
Boston Weather May
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Temperatures trend during May in Boston
See the weather trend as well as the moving average line
May weather in Boston day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Cloudy | 15° /6° | 3 mm | 5 | |
| May 2 | Cloudy | 16° /8° | 4.4 mm | 4 | |
| May 3 |  Patchy rain possible | 14° /8° | 1.1 mm | 3 | |
| May 4 |  Heavy rain at times | 13° /7° | 8.6 mm | 4 | |
| May 5 |  Moderate or heavy rain shower | 15° /8° | 8.9 mm | 4 | |
| May 6 |  Sunny | 18° /9° | 10.8 mm | 5 | |
| May 7 |  Overcast | 17° /10° | 1.7 mm | 5 | |
| May 8 | Patchy rain possible | 16° /8° | 1.2 mm | 5 | |
| May 9 | Patchy rain possible | 15° /7° | 5.3 mm | 4 | |
| May 10 | Sunny | 16° /8° | 3.4 mm | 4 | |
| May 11 | Patchy rain possible | 17° /8° | 0.3 mm | 5 | |
| May 12 | Cloudy | 18° /8° | 0.3 mm | 5 | |
| May 13 | Patchy rain possible | 19° /10° | 0.2 mm | 5 | |
| May 14 |  Partly cloudy | 21° /11° | 3.6 mm | 5 | |
| May 15 | Patchy rain possible | 20° /11° | 2 mm | 4 | |
| May 16 | Partly cloudy | 22° /13° | 0.4 mm | 6 | |
| May 17 | Patchy rain possible | 20° /12° | 4.6 mm | 5 | |
| May 18 | Partly cloudy | 20° /10° | 0 mm | 6 | |
| May 19 | Patchy rain possible | 20° /11° | 0.4 mm | 5 | |
| May 20 | Patchy rain possible | 20° /11° | 6.6 mm | 5 | |
| May 21 | Partly cloudy | 22° /12° | 8.9 mm | 6 | |
| May 22 | Patchy rain possible | 21° /12° | 33.7 mm | 6 | |
| May 23 | Overcast | 20° /12° | 6.1 mm | 6 | |
| May 24 |  Moderate rain | 11° /10° | 12.3 mm | 0.6 | |
| May 25 | Patchy rain possible | 15° /11° | 3.9 mm | 5 | |
| May 26 | Partly cloudy | 25° /11° | 0 mm | 4.7 | |
| May 27 | Patchy rain possible | 25° /16° | 0.1 mm | 7.6 | |
| May 28 | Patchy rain possible | 23° /11° | 1.2 mm | 1.3 | |
| May 29 | Partly cloudy | 20° /11° | 0 mm | 4 | |
| May 30 | Moderate rain | 12° /11° | 5.5 mm | 3 | |
| May 31 | Patchy rain possible | 18° /9° | 0.3 mm | 3 | |
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Important Notice
Our weather forecast for Boston 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 Boston forecast closer to your planned date for the most up-to-date weather information.
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Boston in May - FAQ
What are the expected maximum and minimum temperatures in Boston during May?
Enjoy moderate daytime temperatures of up to 18° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Boston during May?
Significant rainfall exceeding 155.5 mm is expected in Boston during May, occurring over more than 21 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Boston during May?
The average wind speed in Boston during May is 17 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Boston
Explore the daily rainfall trends and prepare for Bostons May weather 💧
Typically, Boston has 21 rainy days in May with a total of 155.5 mm of rainfall.
UV exposure in Boston during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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