WXSIM: Chelmer Village
Updated: Monday, 18.05.2026 17:00 UTC
 
Tonight

Chance rain
Chance rain
Tuesday

Chance rain
Chance rain
Tuesday
night
Mostly Cloudy
Mostly Cloudy
Wednesday

Partly Cloudy
Partly Cloudy
Wednesday
night
Partly Cloudy
Partly Cloudy
Thursday

Mostly Cloudy
Mostly Cloudy
Thursday
night
Partly Cloudy
Partly Cloudy
Friday

Partly Cloudy
Partly Cloudy
Friday
night
Mostly Cloudy
Mostly Cloudy
<5 mm. 2 mm. <2 mm. <2 mm.
Low: 9° High: 18° Low: 9° High: 19° Low: 11° High: 23° Low: 11° High: 25° Low: 13°



























 

WU Forecast: Chelmsford

Today
AM Light Rain
AM Light Rain
Tonight
Partly Cloudy
Partly Cloudy
Tomorrow
AM Clouds, PM Sun
AM Clouds, PM Sun
Tomorrow night
Partly Cloudy
Partly Cloudy
Thursday
Mostly Cloudy
Mostly Cloudy
Thursday night
Partly Cloudy
Partly Cloudy
Friday
Mostly Sunny
Mostly Sunny
Friday night
Partly Cloudy
Partly Cloudy
Saturday
Partly Cloudy
Partly Cloudy
17°C11°C20°C11°C23°C12°C27°C15°C27°C

WXSIM Forecast Accuracy

Actual Observed (Act), WxSim Generated (WS) , Weather Underground (WU)

Morning Forecast

Updated: 05-18-26 at 9:20 am
Goal Forecast Day Day +1 Day +2 Day +3
± 2.0° C High Low High Low High Low High Low
Date WU Act WS WU Act WS WU Act WS WU Act WS WU Act WS WU Act WS WU Act WS WU Act WS
05-18-26 15   15 11   10 17   18 12   10 19   20 11   11 23   23 13   12
05-17-26 17 17 17 8 6.8 7 15   15 11   9 17   17 12   9 19   20 11   11
05-16-26 15 14.2 14 9 9.9 9 16 17 17 8 6.8 6 16   15 10   8 17   18 12   9
05-15-26 14 14.1 13 4 5.1 6 15 14.2 15 10 9.9 6 16 17 15 8 6.8 8 15   16 10   9
05-14-26 12 11.8 12 5 5.5 6 15 14.1 13 4 5.1 5 15 14.2 15 9 9.9 6 16 17 15 8 6.8 9
05-13-26 14 12.6 13 6 5.2 6 13 11.8 14 5 5.5 5 14 14.1 14 4 5.1 5 15 14.2 15 9 9.9 6
05-12-26 17 15.2 15 8 7.5 5 13 12.6 14 6 5.2 5 14 11.8 14 5 5.5 5 14 14.1 12 5 5.1 5
05-11-26 14 11.7 13 2 0.9 3 17 15.2 16 7 7.5 4 14 12.6 14 6 5.2 5 13 11.8 13 5 5.5 6
05-10-26 15 12.5 16 3 1.9 4 14 11.7 12 2 0.9 4 18 15.2 16 8 7.5 5 15 12.6 14 6 5.2 5
05-09-26 22 18.8 18 9 9.2 7 15 12.5 14 4 1.9 4 15 11.7 14 6 0.9 4 18 15.2 16 8 7.5 5
05-08-26 19 17.1 17 8 6.3 8 22 18.8 19 9 9.2 9 16 12.5 15 4 1.9 4 16 11.7 13 6 0.9 4
05-07-26 16 13.5 15 7 4.2 7 19 17.1 18 9 6.3 9 21 18.8 19 10 9.2 9 16 12.5 17 5 1.9 5
05-06-26 14 12.9 14 7 7.8 8 17 13.5 15 7 4.2 8 20 17.1 18 10 6.3 8 22 18.8 19 10 9.2 10
05-05-26 17 16.7 17 8 6.5 9 14 12.9 14 6 7.8 9 17 13.5 15 7 4.2 7 20 17.1 17 9 6.3 8
Results WU Act WS WU Act WS WU Act WS WU Act WS WU Act WS WU Act WS WU Act WS WU Act WS
# Succ 9 12 12 7 8 11 9 6 4 8 7 6 4 8 7 5
% Succ 69.2   92.3 92.3   53.8 66.7   91.7 75.0   50.0 36.4   72.7 63.6   54.5 40.0   80.0 70.0   50.0
Ave Error 1.4   0.8 1.1   1.5 1.7   1.0 1.2   1.8 2.2   1.3 1.8   1.7 2.2   1.4 1.6   1.8
Net Error 1.4   0.5 0.6   0.6 1.6   0.8 0.6   0.3 2.0   1.0 1.3   0.3 2.0   0.6 1.3   0.5
Std Dev 1.1   0.9 0.7   1.0 1.0   0.7 0.9   1.5 1.5   1.0 1.5   1.4 1.7   1.0 1.2   1.6