Jefferson County (Watertown)
May
Weather in Jefferson County, New York for May 2026
Your guide to Jefferson County weather in May - trends and predictions
Until now, May 2026 in Jefferson County is slightly cooler than the historical average by -1.1 °F.
The forecast for the coming days of May 2026 predicts a temperature of 20.4 °F , which is warmer than usual.
In general, the average temperature in Jefferson County at the beginning of May is 14.1 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 18.6 °F by the end of May.
Jefferson County experiences heavy rainfall in May, with over 20 rainy days and an average total precipitation 159.5 mm.
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Temperatures
Rain 🌧️
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4
Dry days
27
Rainy days
0
Snow days
16°/8°
Temperatures
18 km/h
Avg max wind
81 %
Avg humidity
Jefferson County Weather May
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Temperatures trend during May in Jefferson County
See the weather trend as well as the moving average line
May weather in Jefferson County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Fog | 13° /2° | 0.2 mm | 3 | |
| May 2 |  Patchy rain possible | 11° /7° | 5.3 mm | 4 | |
| May 3 |  Overcast | 13° /4° | 0.1 mm | 5 | |
| May 4 |  Light rain | 16° /7° | 2.1 mm | 3 | |
| May 5 | Light rain | 16° /9° | 4.3 mm | 3 | |
| May 6 | Light drizzle | 16° /8° | 5.5 mm | 4 | |
| May 7 | Mist | 14° /6° | 5.3 mm | 5 | |
| May 8 | Light rain shower | 11° /5° | 5.9 mm | 5 | |
| May 9 | Fog | 12° /4° | 1.5 mm | 4 | |
| May 10 | Light rain shower | 14° /4° | 1.4 mm | 5 | |
| May 11 | Light rain shower | 12° /3° | 2.3 mm | 5 | |
| May 12 | Light rain | 14° /3° | 1 mm | 6 | |
| May 13 | Light rain | 18° /9° | 6.9 mm | 3 | |
| May 14 | Light rain shower | 16° /10° | 7.1 mm | 3 | |
| May 15 |  Moderate rain at times | 18° /11° | 4.7 mm | 4 | |
| May 16 | Light rain shower | 21° /11° | 1.2 mm | 6 | |
| May 17 | Moderate or heavy rain shower | 21° /12° | 41 mm | 6 | |
| May 18 | Patchy rain possible | 20° /11° | 6 mm | 5 | |
| May 19 | Patchy rain possible | 19° /11° | 2.4 mm | 5 | |
| May 20 | Fog | 18° /8° | 2.8 mm | 6 | |
| May 21 |  Cloudy | 17° /11° | 1.6 mm | 4 | |
| May 22 | Light rain shower | 19° /8° | 11 mm | 6 | |
| May 23 | Fog | 16° /8° | 5.6 mm | 3 | |
| May 24 |  Partly cloudy | 14° /7° | 6.7 mm | 3 | |
| May 25 | Patchy rain possible | 18° /8° | 6.9 mm | 4 | |
| May 26 | Fog | 20° /9° | 0 mm | 6 | |
| May 27 | Light rain shower | 20° /10° | 5.8 mm | 5 | |
| May 28 | Light rain shower | 19° /10° | 2 mm | 5 | |
| May 29 | Patchy rain possible | 19° /7° | 0.9 mm | 6.5 | |
| May 30 | Patchy rain possible | 16° /8° | 0.2 mm | 6.8 | |
| May 31 | Partly cloudy | 18° /6° | 0.1 mm | 6.6 | |
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Important Notice
Our weather forecast for Jefferson 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 Jefferson County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Jefferson County in May - FAQ
What are the expected maximum and minimum temperatures in Jefferson County during May?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 8°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Jefferson County during May?
Significant rainfall exceeding 159.5 mm is expected in Jefferson County during May, occurring over more than 27 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Jefferson County during May?
The average wind speed in Jefferson County during May is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Jefferson County
Explore the daily rainfall trends and prepare for Jefferson Countys May weather 💧
Typically, Jefferson County has 27 rainy days in May with a total of 159.5 mm of rainfall.
UV exposure in Jefferson County during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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Where is Jefferson County?Get accurate weather forecasts for Jefferson County, located at latitude 43.975 and longitude -75.911. Stay updated with localized weather information tailored for Jefferson County.
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