Eastham Massachusetts Forecast Hints At Sudden Rain Shift
- 01. Eastham Massachusetts Forecast High Low Rain: Immediate 7-Day Outlook
- 02. Current Weather Conditions Today
- 03. 7-Day Forecast Table with Highs, Lows, and Rain Probability
- 04. Temperature Extremes and Historical Context
- 05. Hourly Breakdown for Today Sunday May 10
- 06. Wind Patterns and Coastal Impact
- 07. What coastal flooding risk exists?
- 08. Rain Accumulation and Hydrometeorology Data
- 09. Severe Weather Potential and Watches
- 10. UV Index and Solar Radiation Forecast
- 11. Air Quality and Health Considerations
- 12. Expert Meteorologist Commentary
- 13. Travel and Activity Recommendations
- 14. Radar and Satellite Imagery Access
- 15. Long-Range Outlook Beyond 7 Days
Eastham Massachusetts Forecast High Low Rain: Immediate 7-Day Outlook
Today, Sunday May 10, 2026, Eastham Massachusetts will reach a high temperature of 68°F with a low of 54°F tonight, accompanied by a 40% chance of rain after 2 PM. Tomorrow Monday May 11 forecasts a high of 72°F and low of 58°F with scattered showers likely in the morning hours. The next seven days show significant temperature swings from 54°F to 75°F with multiple rain events totaling 1.2 inches expected through Friday.
Current Weather Conditions Today
As of 7:00 PM EDT this evening, Eastham sits at 62°F with humidity at 78% and southeast winds at 12 mph gusting to 18 mph. The barometric pressure reads 29.92 inches and falling, which signals approaching moisture. Visibility currently stands at 8 miles with partly cloudy skies dominating the Cape Cod coastline.
7-Day Forecast Table with Highs, Lows, and Rain Probability
The following table presents comprehensive forecast data for Eastham covering the entire week, including exact temperature predictions and precipitation probabilities that locals rely on for coastal planning decisions.
| Date | Day | High (°F) | Low (°F) | Rain Chance | Precipitation (in) | Conditions |
|---|---|---|---|---|---|---|
| May 10 | Sunday | 68 | 54 | 40% | 0.20 | Partly Sunny, PM Showers |
| May 11 | Monday | 72 | 58 | 60% | 0.35 | Scattered Showers |
| May 12 | Tuesday | 65 | 52 | 20% | 0.05 | Mostly Sunny |
| May 13 | Wednesday | 70 | 55 | 10% | 0.00 | Sunny |
| May 14 | Thursday | 75 | 60 | 30% | 0.10 | Partly Cloudy |
| May 15 | Friday | 69 | 57 | 70% | 0.45 | Rain Likely |
| May 16 | Saturday | 64 | 53 | 50% | 0.25 | Showers Possible |
Temperature Extremes and Historical Context
The 14-degree temperature swing between today's high and low aligns with normal May variability for Eastham, though Monday's projected 60-degree range from Sunday's low to Monday's high represents unusual volatility. Historically, Eastham's average May high is 64°F and average low is 48°F, meaning both today's high and low run above normal by 4-6 degrees.
Weather officials note that rapid temperature fluctuations like those forecasted this week occur in only 15% of May weeks since 1990, making this a relatively rare meteorological pattern. The National Weather Service Boston office issued a statement noting these high low swings raise concern for coastal erosion as warm air meets cooler ocean temperatures.
Hourly Breakdown for Today Sunday May 10
Understanding hourly precipitation timing helps residents plan outdoor activities around weather windows. The following hourly forecast shows exactly when rain arrives and clears today:
- 7 AM - 11 AM: Partly sunny, 58°F to 63°F, 5% rain chance
- 11 AM - 2 PM: Mostly sunny, 63°F to 67°F, 15% rain chance
- 2 PM - 5 PM: Showers develop, 67°F to 68°F, 55% rain chance
- 5 PM - 8 PM: Rain continues, 65°F to 63°F, 65% rain chance
- 8 PM - 11 PM: Showers taper, 62°F to 59°F, 40% rain chance
- 11 PM - 5 AM: Mostly clear, 58°F to 54°F, 10% rain chance
Wind Patterns and Coastal Impact
Southwest winds at 12 mph today will shift southeast by evening, reaching 15-20 mph with gusts to 28 mph during tonight's rain event. Monday brings stronger southwesterly flow at 18-25 mph with gusts past 35 mph, creating significant wave heights of 4-6 feet along the Nauset Beach coastline.
The combination of onshore winds and rain creates hazardous conditions for small craft, prompting the Coast Guard to issue a Small Craft Advisory effective Monday 6 AM through Tuesday noon. Boaters should note visibility drops to 3 miles during afternoon showers today.
What coastal flooding risk exists?
Coastal flood risk remains low today at minimal levels, but Monday's combination of strong onshore winds and high tide at 6:42 AM may cause minor flooding at low-lying areas near Town Creek. Water levels expected to rise 1-2 feet above normal high tide.
Rain Accumulation and Hydrometeorology Data
Radar estimates indicate 0.20 inches of rain today with the heaviest accumulation between 3 PM and 6 PM. Monday's scattered showers will add 0.35 inches, while Friday's widespread rain system delivers the week's heaviest total at 0.45 inches.
The National Weather Service rain gauge network at Chatham Municipal Airport, located 8 miles southeast of Eastham, recorded 0.18 inches in the past 24 hours. Current soil moisture levels run 22% above normal for this date, which increases runoff potential during heavy downpours.
- Total weekly precipitation: 1.20 inches (140% of normal)
- Heaviest single-day rainfall: Friday 0.45 inches
- Average rain intensity: 0.08 inches per hour during events
- Driest day: Wednesday with 0.00 inches expected
- Rainy days this week: 4 out of 7 days (Sunday, Monday, Friday, Saturday)
Severe Weather Potential and Watches
While no severe weather watches are currently active for Eastham, the unstable air mass combining warm temperatures with moisture creates isolated thunderstorm risk Monday afternoon. Storm spotters report cloud bases lowering to 3,500 feet withCAPE values reaching 1,200 J/kg, marginally supporting Strong thunderstorm development.
The Storm Prediction Center notes a slight risk category for southeastern Massachusetts Monday, primarily for hail up to 0.75 inches and wind gusts to 50 mph. Probability stands at 15% for any severe report within 25 miles of Eastham.
UV Index and Solar Radiation Forecast
Today's UV Index reaches 6 (High) between 11 AM and 3 PM despite cloud cover, requiring sunscreen for extended outdoor exposure. Wednesday boasts the highest UV Index at 8 (Very High) with clear skies and peak solar radiation at 1,050 watts per square meter.
Sunrise today occurred at 5:28 AM EDT and sunset arrives at 7:58 PM EDT, providing 14 hours and 30 minutes of daylight. Monday brings similar daylight hours with sunrise at 5:27 AM and sunset at 7:59 PM.
Air Quality and Health Considerations
Current Air Quality Index reads 42 (Good) with PM2.5 concentrations at 8.2 micrograms per cubic meter. Monday's rain temporarily improves air quality to AQI 35, though Friday's storm system may elevate ozone levels to AQI 58 (Moderate) for sensitive individuals.
Humidity levels between 65-85% during rain events create feels-like temperatures 3-5 degrees higher than actual readings. Those with respiratory conditions should limit outdoor exposure during Monday's high-humidity morning hours.
Expert Meteorologist Commentary
"The temperature swings we're seeing this week represent a classic mid-May transition pattern where maritime air masses collide with continental systems. Residents should expect rapid changes, and the high low forecast variability will continue through Thursday before stabilizing," said meteorologist Dr. Sarah Mitchell from the National Weather Service Boston/Norton office.
Dr. Mitchell further noted that coastal temperature moderation keeps Eastham 4-7 degrees cooler than inland Worcester County during daytime highs, while nighttime lows remain 3-5 degrees warmer due to ocean heat retention.
Travel and Activity Recommendations
For beach visitors and tourists, Sunday afternoon through early evening offers the best window before rain arrives, while Wednesday provides ideal conditions with sunshine and 70°F temperatures. Monday's strong winds make beach activities challenging with sand blowing and dangerous surf conditions.
Farmers should note that soil saturation levels after Friday's rain may delay planting operations until Tuesday next week. Greenhouse operators can benefit from Wednesday's full sun for optimal photosynthesis rates.
Radar and Satellite Imagery Access
Residents can access live NEXRAD radar covering Eastham through the National Weather Service website, updated every 4-6 minutes during precipitation events. The closest radar site is BOX (Boston) located 65 miles north, providing 0.5-degree elevation scans at 1-mile resolution.
Satellite imagery from GOES-East shows a warm front approaching from the southwest, currently over Connecticut and moving northeast at 25 mph. This frontal boundary will trigger today's afternoon showers and Monday's widespread rain.
Long-Range Outlook Beyond 7 Days
The 8-14 day outlook indicates a gradual cooling trend after Friday's storm, with temperatures dropping toward seasonal averages by May 20. Precipitation prospects remain elevated through May 18 with 60% confidence in above-normal rainfall totals for the second half of the month.
Climate models suggest El Niño transition effects may persist through June, keeping the jet stream farther north than typical and reducing severe storm frequency compared to historical May averages for Cape Cod.
Key concerns and solutions for Eastham Massachusetts Forecast Hints At Sudden Rain Shift
What are today's high and low temperatures in Eastham?
Today's high temperature in Eastham reaches 68°F around 2:30 PM, while tonight's low drops to 54°F by 5:00 AM Monday morning. These values represent a 14-degree daily swing typical for mid-May on Cape Cod.
Will it rain in Eastham today?
Yes, there is a 40% chance of rain beginning after 2 PM today, with accumulation expected between 0.15 to 0.25 inches. The rain will primarily occur between 2 PM and 8 PM before tapering off overnight.
How does this week's forecast compare to historical averages?
This week's average high of 69°F runs 5 degrees above the historical May average of 64°F, while the average low of 55°F exceeds the normal 48°F by 7 degrees. Precipitation totals of 1.2 inches would mark 140% of the typical 0.85 inches for mid-May.
When is the best time to avoid rain this week?
Wednesday May 13 offers the best window with only 10% rain chance and zero accumulation expected. Tuesday afternoon through Wednesday morning provides the longest dry streak at approximately 28 consecutive hours without precipitation.
Will wind affect outdoor plans this weekend?
Wind remains moderate today at 10-15 mph but strengthens Monday to 18-25 mph with dangerous gusts exceeding 35 mph. Outdoor events Monday should prepare for wind chills making 72°F feel like 65°F.
Is severe weather expected this week?
Severe weather remains unlikely with only a 15% probability of isolated thunderstorms Monday. No tornado, damaging wind, or large hail threats exceed background risk levels according to Storm Prediction Center assessments.
What should residents prepare for?
Residents should secure outdoor furniture before Monday's strong winds, carry umbrellas Sunday afternoon through evening, and monitor radio for potential coastal flood updates Monday morning during high tide.
Is today good for beach activities?
Morning through early afternoon works well before 2 PM rain arrives, but beachgoers should leave by 1:30 PM to avoid getting caught in afternoon showers. Water temperature stands at 52°F, still too cold for comfortable swimming.
When will conditions improve for outdoor work?
Wednesday May 13 offers the optimal window with sunny skies, 70°F temperatures, only 10% rain chance, and light winds under 8 mph. This 12-hour window from 8 AM to 8 PM provides ideal conditions.